Sunrise and sunset times in Castro Valley, CA
EditCheck out today's and tomorrow's sunrise and sunset times in Castro Valley, as well as the whole calendar for October 2026.
Noticed slightly different times? We upgraded our calculations
Today
October 18, 2026. Current time: 4:04:30 pm
Night ends at 5:52 am5:52:16 am
Start of astronomical twilight: the Sun is 18° below the horizon and the sky begins to brighten, too faintly to notice in a city.·Dawn at 6:53 am6:53:07 am
Dawn, first light: the start of civil twilight. The Sun is 6° below the horizon, and there is enough light to be outdoors without artificial light.
Sunrise time: 7:19:39 am PDTWhen the top edge of the Sun appears over a flat, clear horizon. Behind hills, mountains or buildings the Sun appears a few minutes later (or more in a valley).
Sunset time: 6:26:32 pm PDTWhen the top edge of the Sun disappears below a flat, clear horizon. Behind hills, mountains or buildings the Sun disappears a few minutes earlier (or more in a valley).
Dusk at 6:53 pm6:53:02 pm
Dusk, when it gets dark: the end of civil twilight. The Sun reaches 6° below the horizon, and from then on artificial light is needed outdoors.·Night at 7:54 pm7:53:49 pm
End of astronomical twilight: the Sun is 18° below the horizon and the sky is dark enough to see the faintest stars. In a city it looks dark sooner.
Sun position chart
Now · Sun altitude: 24.76° · Azimuth: 233.5° (SW)
Daylight Golden Hour Dawn & dusk (civil twilight) Night
Day length: 11 hours, 6 minutes
2 hours, 22 minutes left for today's sunset in Castro Valley
Moon rose on Oct 18 at 2:39 pm
Moon will set on Oct 19 at 12:28 amMoon phase: 🌓 First Quarter (53%)🌕 Full moon: Oct 25 at 9:11 pm · 🌑 New moon: Nov 8 at 11:02 pmTomorrow
October 19, 2026
Night ends at 5:53 am5:53:10 am
Start of astronomical twilight: the Sun is 18° below the horizon and the sky begins to brighten, too faintly to notice in a city.·Dawn at 6:54 am6:54:03 am
Dawn, first light: the start of civil twilight. The Sun is 6° below the horizon, and there is enough light to be outdoors without artificial light.
Sunrise time: 7:20:37 am PDTWhen the top edge of the Sun appears over a flat, clear horizon. Behind hills, mountains or buildings the Sun appears a few minutes later (or more in a valley).
Sunset time: 6:25:12 pm PDTWhen the top edge of the Sun disappears below a flat, clear horizon. Behind hills, mountains or buildings the Sun disappears a few minutes earlier (or more in a valley).
Dusk at 6:52 pm6:51:44 pm
Dusk, when it gets dark: the end of civil twilight. The Sun reaches 6° below the horizon, and from then on artificial light is needed outdoors.·Night at 7:53 pm7:52:33 pm
End of astronomical twilight: the Sun is 18° below the horizon and the sky is dark enough to see the faintest stars. In a city it looks dark sooner.
Day length: 11 hours, 4 minutes
Tomorrow will be 2 minutes shorter than today in Castro Valley
Moon will set on Oct 19 at 12:28 am Moon will rise on Oct 19 at 3:10 pmMoon phase: 🌔 Waxing Gibbous (65%)
- Castro Valley, California
- Latitude: 37.695503 (North)
- Longitude: -122.073868 (West)
- Time zone: Pacific Daylight Time (PDT, UTC−7)
Shortest day in Castro Valley, CA
The shortest day of the year will be in 2 months and 3 days, during the winter solstice on December 21, 2026, with a daylight length of 9 hours, 33 minutes.Longest day in Castro Valley, CA
The longest day of the year was around 3 months ago, during the summer solstice on June 21, 2026, with a daylight length of 14 hours, 46 minutes.
October 2026 - Castro Valley, California - Sunrise and sunset calendar
Sunrise and sunset times, civil twilight start and end times as well as solar noon, and day length for every day of October in Castro Valley.
All times are in Castro Valley's time: Pacific Daylight Time (PDT, UTC−7).
The day length shortens by 1 hour, 9 minutes over the course of October 2026 in Castro Valley, CA - from 11 hours, 47 minutes on the first day to 10 hours, 37 minutes on the last day.
| Day | First LightStart of civil twilight: the Sun is 6° below the horizon, and there is enough light to be outdoors without artificial light. | SunriseWhen the top edge of the Sun appears over a flat, clear horizon. Behind hills, mountains or buildings the Sun appears a few minutes later (or more in a valley). | Sunrise Variation |
SunsetWhen the top edge of the Sun disappears below a flat, clear horizon. Behind hills, mountains or buildings the Sun disappears a few minutes earlier (or more in a valley). | Sunset Variation |
Last LightEnd of civil twilight: the Sun reaches 6° below the horizon, and from then on artificial light is needed outdoors. | Day Length | Day Length Variation | Solar NoonTime of day when the sun reaches its highest point in the sky. | Max Sun Altitude | Nautical Twilight Start | Nautical Twilight End | Astronomical Twilight Start | Astronomical Twilight End | Night LengthCalculated from this day's sunset to the next day's sunrise. | Moon phase | Solar Midnight | Sun DeclinationThe latitude where the Sun is directly overhead at solar noon (the Sun's declination). It moves between the two tropics through the year. |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Thu, Oct 1 | Twilight startStart of civil twilight: the Sun is 6° below the horizon, and there is enough light to be outdoors without artificial light.6:37:54 am | 7:04:03 am | +53s | 6:51:05 pm | -1m 31s | Twilight endEnd of civil twilight: the Sun reaches 6° below the horizon, and from then on artificial light is needed outdoors.7:17:12 pm | 11h 47m 2s | -2m 24s | Solar noonTime of day when the sun reaches its highest point in the sky.12:57:52 pm | 48.87° | 6:07:30 am | 7:47:32 pm | 5:36:53 am | 8:18:05 pm | Night lengthCalculated from this day's sunset to the next day's sunrise.12h 13m 51s | 🌖 (64%)Waning Gibbous: 64% illuminated at midnight, at the end of the day | 12:58:02 am | 3.4° S |
| Fri, Oct 2 | 6:38:46 am | 7:04:56 am | +53s | 6:49:34 pm | -1m 31s | 7:15:41 pm | 11h 44m 38s | -2m 24s | 12:57:32 pm | 48.48° | 6:08:23 am | 7:46:01 pm | 5:37:48 am | 8:16:32 pm | 12h 16m 15s | 🌖 (53%)Waning Gibbous: 53% illuminated at midnight, at the end of the day | 12:57:42 am | 3.8° S |
| Sat, Oct 3 | 6:39:39 am | 7:05:49 am | +53s | 6:48:03 pm | -1m 31s | 7:14:11 pm | 11h 42m 14s | -2m 24s | 12:57:13 pm | 48.10° | 6:09:16 am | 7:44:30 pm | 5:38:43 am | 8:14:59 pm | 12h 18m 39s | 🌗 (42%) Last quarter at 6:25 amLast quarter at 6:25 am. At midnight, at the end of the day: 42% illuminated |
12:57:22 am | 4.2° S |
| Sun, Oct 4 | 6:40:31 am | 7:06:42 am | +53s | 6:46:33 pm | -1m 30s | 7:12:42 pm | 11h 39m 51s | -2m 23s | 12:56:55 pm | 47.71° | 6:10:09 am | 7:43:00 pm | 5:39:38 am | 8:13:28 pm | 12h 21m 2s | 🌘 (31%)Waning Crescent: 31% illuminated at midnight, at the end of the day | 12:57:04 am | 4.6° S |
| Mon, Oct 5 | 6:41:24 am | 7:07:35 am | +53s | 6:45:03 pm | -1m 30s | 7:11:13 pm | 11h 37m 28s | -2m 23s | 12:56:37 pm | 47.33° | 6:11:02 am | 7:41:31 pm | 5:40:32 am | 8:11:57 pm | 12h 23m 26s | 🌘 (21%)Waning Crescent: 21% illuminated at midnight, at the end of the day | 12:56:46 am | 5.0° S |
| Tue, Oct 6 | 6:42:17 am | 7:08:29 am | +54s | 6:43:34 pm | -1m 29s | 7:09:44 pm | 11h 35m 5s | -2m 23s | 12:56:19 pm | 46.95° | 6:11:55 am | 7:40:03 pm | 5:41:27 am | 8:10:28 pm | 12h 25m 49s | 🌘 (13%)Waning Crescent: 13% illuminated at midnight, at the end of the day | 12:56:28 am | 5.4° S |
| Wed, Oct 7 | 6:43:10 am | 7:09:23 am | +54s | 6:42:05 pm | -1m 29s | 7:08:17 pm | 11h 32m 42s | -2m 23s | 12:56:01 pm | 46.56° | 6:12:48 am | 7:38:35 pm | 5:42:21 am | 8:08:59 pm | 12h 28m 13s | 🌘 (6%)Waning Crescent: 6% illuminated at midnight, at the end of the day | 12:56:10 am | 5.7° S |
| Thu, Oct 8 | 6:44:03 am | 7:10:18 am | +55s | 6:40:37 pm | -1m 28s | 7:06:50 pm | 11h 30m 19s | -2m 23s | 12:55:44 pm | 46.18° | 6:13:42 am | 7:37:08 pm | 5:43:16 am | 8:07:31 pm | 12h 30m 35s | 🌘 (2%)Waning Crescent: 2% illuminated at midnight, at the end of the day | 12:55:52 am | 6.1° S |
| Fri, Oct 9 | 6:44:57 am | 7:11:12 am | +54s | 6:39:09 pm | -1m 28s | 7:05:23 pm | 11h 27m 57s | -2m 22s | 12:55:28 pm | 45.80° | 6:14:35 am | 7:35:42 pm | 5:44:10 am | 8:06:04 pm | 12h 32m 58s | 🌘 (0.2%)Waning Crescent: 0.2% illuminated at midnight, at the end of the day | 12:55:36 am | 6.5° S |
| Sat, Oct 10 | 6:45:50 am | 7:12:07 am | +55s | 6:37:42 pm | -1m 27s | 7:03:58 pm | 11h 25m 35s | -2m 22s | 12:55:12 pm | 45.42° | 6:15:28 am | 7:34:17 pm | 5:45:04 am | 8:04:38 pm | 12h 35m 21s | 🌑 (1%) New moon at 8:50 amNew moon at 8:50 am. At midnight, at the end of the day: 1% illuminated |
12:55:20 am | 6.9° S |
| Sun, Oct 11 | 6:46:44 am | 7:13:03 am | +56s | 6:36:16 pm | -1m 26s | 7:02:33 pm | 11h 23m 13s | -2m 22s | 12:54:56 pm | 45.05° | 6:16:21 am | 7:32:53 pm | 5:45:58 am | 8:03:13 pm | 12h 37m 42s | 🌒 (3%)Waxing Crescent: 3% illuminated at midnight, at the end of the day | 12:55:04 am | 7.3° S |
| Mon, Oct 12 | 6:47:38 am | 7:13:58 am | +55s | 6:34:50 pm | -1m 26s | 7:01:09 pm | 11h 20m 52s | -2m 21s | 12:54:41 pm | 44.67° | 6:17:15 am | 7:31:29 pm | 5:46:52 am | 8:01:49 pm | 12h 40m 4s | 🌒 (7%)Waxing Crescent: 7% illuminated at midnight, at the end of the day | 12:54:49 am | 7.6° S |
| Tue, Oct 13 | 6:48:32 am | 7:14:54 am | +56s | 6:33:25 pm | -1m 25s | 6:59:45 pm | 11h 18m 31s | -2m 21s | 12:54:26 pm | 44.30° | 6:18:08 am | 7:30:07 pm | 5:47:46 am | 8:00:26 pm | 12h 42m 25s | 🌒 (13%)Waxing Crescent: 13% illuminated at midnight, at the end of the day | 12:54:33 am | 8.0° S |
| Wed, Oct 14 | 6:49:27 am | 7:15:50 am | +56s | 6:32:01 pm | -1m 24s | 6:58:23 pm | 11h 16m 11s | -2m 21s | 12:54:12 pm | 43.93° | 6:19:02 am | 7:28:45 pm | 5:48:40 am | 7:59:04 pm | 12h 44m 46s | 🌒 (20%)Waxing Crescent: 20% illuminated at midnight, at the end of the day | 12:54:19 am | 8.4° S |
| Thu, Oct 15 | 6:50:22 am | 7:16:47 am | +57s | 6:30:38 pm | -1m 23s | 6:57:01 pm | 11h 13m 51s | -2m 20s | 12:53:59 pm | 43.56° | 6:19:56 am | 7:27:25 pm | 5:49:34 am | 7:57:44 pm | 12h 47m 6s | 🌒 (28%)Waxing Crescent: 28% illuminated at midnight, at the end of the day | 12:54:06 am | 8.7° S |
| Fri, Oct 16 | 6:51:17 am | 7:17:44 am | +57s | 6:29:15 pm | -1m 23s | 6:55:40 pm | 11h 11m 31s | -2m 20s | 12:53:46 pm | 43.19° | 6:20:50 am | 7:26:05 pm | 5:50:28 am | 7:56:24 pm | 12h 49m 26s | 🌒 (37%)Waxing Crescent: 37% illuminated at midnight, at the end of the day | 12:53:53 am | 9.1° S |
| Sat, Oct 17 | 6:52:12 am | 7:18:41 am | +57s | 6:27:53 pm | -1m 22s | 6:54:21 pm | 11h 9m 12s | -2m 19s | 12:53:33 pm | 42.82° | 6:21:44 am | 7:24:47 pm | 5:51:22 am | 7:55:06 pm | 12h 51m 46s | 🌒 (46%)Waxing Crescent: 46% illuminated at midnight, at the end of the day | 12:53:39 am | 9.5° S |
| Sun, Oct 18 | 6:53:07 am | 7:19:39 am | +58s | 6:26:32 pm | -1m 21s | 6:53:02 pm | 11h 6m 53s | -2m 19s | 12:53:21 pm | 42.46° | 6:22:38 am | 7:23:30 pm | 5:52:16 am | 7:53:49 pm | 12h 54m 5s | 🌓 (56%) First quarter at 9:12 amFirst quarter at 9:12 am. At midnight, at the end of the day: 56% illuminated |
12:53:27 am | 9.8° S |
| Mon, Oct 19 | 6:54:03 am | 7:20:37 am | +58s | 6:25:12 pm | -1m 20s | 6:51:44 pm | 11h 4m 35s | -2m 18s | 12:53:10 pm | 42.10° | 6:23:32 am | 7:22:13 pm | 5:53:10 am | 7:52:33 pm | 12h 56m 23s | 🌔 (65%)Waxing Gibbous: 65% illuminated at midnight, at the end of the day | 12:53:15 am | 10.2° S |
| Tue, Oct 20 | 6:54:59 am | 7:21:35 am | +58s | 6:23:53 pm | -1m 19s | 6:50:27 pm | 11h 2m 18s | -2m 17s | 12:53:00 pm | 41.74° | 6:24:26 am | 7:20:58 pm | 5:54:04 am | 7:51:18 pm | 12h 58m 41s | 🌔 (74%)Waxing Gibbous: 74% illuminated at midnight, at the end of the day | 12:53:05 am | 10.6° S |
| Wed, Oct 21 | 6:55:55 am | 7:22:34 am | +59s | 6:22:35 pm | -1m 18s | 6:49:12 pm | 11h 0m 1s | -2m 17s | 12:52:50 pm | 41.39° | 6:25:21 am | 7:19:44 pm | 5:54:58 am | 7:50:05 pm | 13h 0m 58s | 🌔 (83%)Waxing Gibbous: 83% illuminated at midnight, at the end of the day | 12:52:55 am | 10.9° S |
| Thu, Oct 22 | 6:56:52 am | 7:23:33 am | +59s | 6:21:18 pm | -1m 17s | 6:47:57 pm | 10h 57m 45s | -2m 16s | 12:52:41 pm | 41.03° | 6:26:16 am | 7:18:31 pm | 5:55:52 am | 7:48:53 pm | 13h 3m 14s | 🌔 (90%)Waxing Gibbous: 90% illuminated at midnight, at the end of the day | 12:52:46 am | 11.3° S |
| Fri, Oct 23 | 6:57:49 am | 7:24:32 am | +59s | 6:20:01 pm | -1m 17s | 6:46:44 pm | 10h 55m 29s | -2m 16s | 12:52:32 pm | 40.68° | 6:27:11 am | 7:17:20 pm | 5:56:47 am | 7:47:42 pm | 13h 5m 31s | 🌔 (95%)Waxing Gibbous: 95% illuminated at midnight, at the end of the day | 12:52:36 am | 11.6° S |
| Sat, Oct 24 | 6:58:46 am | 7:25:32 am | +1m 0s | 6:18:46 pm | -1m 15s | 6:45:31 pm | 10h 53m 14s | -2m 15s | 12:52:24 pm | 40.34° | 6:28:06 am | 7:16:10 pm | 5:57:41 am | 7:46:32 pm | 13h 7m 46s | 🌔 (99%)Waxing Gibbous: 99% illuminated at midnight, at the end of the day | 12:52:28 am | 12.0° S |
| Sun, Oct 25 | 6:59:43 am | 7:26:32 am | +1m 0s | 6:17:32 pm | -1m 14s | 6:44:20 pm | 10h 51m 0s | -2m 14s | 12:52:17 pm | 39.99° | 6:29:01 am | 7:15:01 pm | 5:58:35 am | 7:45:24 pm | 13h 10m 0s | 🌕 (99.8%) Full moon at 9:11 pmFull moon at 9:11 pm. At midnight, at the end of the day: 99.8% illuminated |
12:52:20 am | 12.3° S |
| Mon, Oct 26 | 7:00:41 am | 7:27:32 am | +1m 0s | 6:16:20 pm | -1m 12s | 6:43:10 pm | 10h 48m 48s | -2m 13s | 12:52:11 pm | 39.65° | 6:29:57 am | 7:13:53 pm | 5:59:30 am | 7:44:18 pm | 13h 12m 13s | 🌖 (98%)Waning Gibbous: 98% illuminated at midnight, at the end of the day | 12:52:14 am | 12.7° S |
| Tue, Oct 27 | 7:01:38 am | 7:28:33 am | +1m 1s | 6:15:08 pm | -1m 12s | 6:42:02 pm | 10h 46m 35s | -2m 12s | 12:52:05 pm | 39.31° | 6:30:52 am | 7:12:47 pm | 6:00:24 am | 7:43:13 pm | 13h 14m 26s | 🌖 (94%)Waning Gibbous: 94% illuminated at midnight, at the end of the day | 12:52:07 am | 13.0° S |
| Wed, Oct 28 | 7:02:37 am | 7:29:34 am | +1m 1s | 6:13:58 pm | -1m 10s | 6:40:54 pm | 10h 44m 24s | -2m 11s | 12:52:01 pm | 38.98° | 6:31:48 am | 7:11:42 pm | 6:01:19 am | 7:42:09 pm | 13h 16m 38s | 🌖 (87%)Waning Gibbous: 87% illuminated at midnight, at the end of the day | 12:52:03 am | 13.3° S |
| Thu, Oct 29 | 7:03:35 am | 7:30:36 am | +1m 2s | 6:12:48 pm | -1m 10s | 6:39:48 pm | 10h 42m 12s | -2m 11s | 12:51:57 pm | 38.65° | 6:32:44 am | 7:10:38 pm | 6:02:13 am | 7:41:07 pm | 13h 18m 49s | 🌖 (78%)Waning Gibbous: 78% illuminated at midnight, at the end of the day | 12:51:59 am | 13.7° S |
| Fri, Oct 30 | 7:04:33 am | 7:31:37 am | +1m 1s | 6:11:41 pm | -1m 7s | 6:38:43 pm | 10h 40m 4s | -2m 10s | 12:51:53 pm | 38.32° | 6:33:40 am | 7:09:36 pm | 6:03:08 am | 7:40:06 pm | 13h 20m 58s | 🌖 (68%)Waning Gibbous: 68% illuminated at midnight, at the end of the day | 12:51:54 am | 14.0° S |
| Sat, Oct 31 | 7:05:32 am | 7:32:39 am | +1m 2s | 6:10:34 pm | -1m 7s | 6:37:40 pm | 10h 37m 55s | -2m 9s | 12:51:51 pm | 38.00° | 6:34:36 am | 7:08:35 pm | 6:04:03 am | 7:39:07 pm | 13h 23m 7s | 🌖 (56%)Waning Gibbous: 56% illuminated at midnight, at the end of the day | 12:51:52 am | 14.3° S |
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Year distribution of sunrise and sunset times in Castro Valley, CA - 2026
The following graph shows sunrise and sunset times in Castro Valley, CA for every day of the year. There are two jumps in the graph that represent the hour change for Daylight Saving Time (DST) in Castro Valley, CA.
Daylight Dawn & dusk (civil twilight) Night Solar noon · Vertical steps in the curves = DST clock change
Earliest and latest sunrise and sunset in Castro Valley, CA
In Castro Valley, CA, the earliest sunrise of 2026 is on June 13 at 5:46 am, while the latest sunrise is on October 31 at 7:32 am. The earliest sunset is on December 6 at 4:49 pm, and the latest sunset is on June 28 at 8:34 pm.
Castro Valley, CA gets 5h 13m more daylight on the longest day than on the shortest one (14h 46m versus 9h 33m). Averaged over the whole year, a day lasts 12h 11m.
Castro Valley, CA Analemma
Due to Earth's tilted axis and slightly elliptical orbit, the Sun is never seen in the same position at noon in Castro Valley. Throughout the year, it slowly traces this figure-eight:
Move along the curve to read the Sun's altitude and azimuth for any day of the year in Castro Valley.
Over the year, the 12:00 Sun swings between just 28.8° above the horizon (around Dec 21) and 75.6° (around Jun 21) in Castro Valley. The smaller loop sits at the top, the signature of a Northern Hemisphere analemma.
Detailed Analemma Chart
The technical chart below plots one dot per day, labels the first day of each month, marks the solstices, equinoxes, perihelion and aphelion, and draws the noon altitude of the equinoxes (90° minus your latitude) together with its ±23.4° seasonal limits.
Why does the figure look wider here than in the sky view above?
Both draw the same data, but with different conventions. The sky view uses the same scale on both axes, so it shows the analemma with its true proportions, as a camera would capture it: about 47° tall and only a few degrees wide. This chart, like most technical analemma diagrams, stretches each axis independently to fill the plot, expanding the narrow azimuth range several times so its day-to-day variation can actually be read. Also, azimuth is not sky distance: near the zenith, one degree of azimuth spans much less than one degree across the sky, which further widens the figure in this representation.
Places near Castro Valley, CA
These nearby towns and cities have almost the same sunrise and sunset times as Castro Valley, CA — the difference is only seconds to a couple of minutes. Select any place to see its own sun calendar:
Hayward 2 miSan Lorenzo 3 miSan Leandro 5 miUnion City 7 miDublin 8 miSan Ramon 8 miOAK - Metropolitan Oakland International Airport 8 miDanville 10 mi