Sun Times in Castro Valley
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Frequently Asked Questions
What time is sunrise in Castro Valley?
Sunrise in Castro Valley on Thursday, August 27, 2026 is at 6:35 AM (America/Los_Angeles). This time is calculated from the city's coordinates.
What time is sunset in Castro Valley?
Sunset in Castro Valley on Thursday, August 27, 2026 is at 7:43 PM (America/Los_Angeles). This time is calculated from the city's coordinates.
When is golden hour in Castro Valley?
Morning golden hour in Castro Valley ends at 7:10 AM. Evening golden hour starts at 7:08 PM.
How long is the day in Castro Valley?
On Thursday, August 27, 2026 in Castro Valley there are 13 hours and 7 minutes of daylight between sunrise and sunset.
What time is the sun at its highest point in Castro Valley?
The sun reaches its highest point (solar noon) in Castro Valley at 1:09 PM (America/Los_Angeles). This is when the sun crosses the meridian and shadows are at their shortest.
What time does it get dark in Castro Valley?
In Castro Valley, sunset is at 7:43 PM and it gets fully dark (astronomical dusk) at 9:15 PM (America/Los_Angeles). Civil twilight ends at 8:10 PM when outdoor activities need artificial light.
How long does twilight last in Castro Valley?
Twilight in Castro Valley lasts approximately 93 minutes from sunset to full darkness (astronomical dusk). This includes civil twilight, nautical twilight, and astronomical twilight.
What is the earliest sunrise of the year in Castro Valley?
The earliest sunrise in Castro Valley in 2026 is at 5:46 AM on June 6 (America/Los_Angeles). This occurs around the summer solstice when days are longest.
What is the latest sunset of the year in Castro Valley?
The latest sunset in Castro Valley in 2026 is at 8:34 PM on June 25 (America/Los_Angeles). This occurs shortly after the summer solstice.
What time does it actually get dark after sunset in Castro Valley?
After sunset at 7:43 PM in Castro Valley, civil twilight ends at 8:10 PM — about 27 minutes later — when the sky becomes too dark for outdoor activities without artificial light. Full darkness (astronomical dusk) arrives at 9:15 PM (America/Los_Angeles).
What these times mean
Solar times in Castro Valley shift throughout the year. Each stage of the day brings distinct light that photographers, outdoor planners, and everyday users rely on.
- Dawn
- The first usable twilight before sunrise, when the horizon brightens and color gradually returns to the sky.
- Sunrise
- The moment the upper edge of the sun appears above the horizon, starting direct daylight.
- Golden Hour
- The low-angle window just after sunrise and just before sunset, producing warm, soft light favored by photographers.
- Sunset
- The moment the upper edge of the sun drops below the horizon, ending direct sunlight for the day.
- Dusk
- The fading twilight after sunset, ending with astronomical dusk when the sky becomes fully dark.
Monthly daylight in Castro Valley
Sunrise, sunset, and total daylight in Castro Valley on the 15th of each month for 2026. Times reflect the city's local timezone.
| Month | Sunrise | Sunset | Daylight |
|---|---|---|---|
| January | 7:22 AM | 5:13 PM | 9h 51m |
| February | 6:57 AM | 5:47 PM | 10h 50m |
| March | 7:19 AM | 7:15 PM | 11h 57m |
| April | 6:33 AM | 7:44 PM | 13h 11m |
| May | 5:58 AM | 8:11 PM | 14h 13m |
| June | 5:46 AM | 8:31 PM | 14h 46m |
| July | 5:58 AM | 8:29 PM | 14h 31m |
| August | 6:24 AM | 8:00 PM | 13h 37m |
| September | 6:50 AM | 7:15 PM | 12h 25m |
| October | 7:16 AM | 6:30 PM | 11h 14m |
| November | 6:48 AM | 4:57 PM | 10h 08m |
| December | 7:16 AM | 4:50 PM | 9h 34m |
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