Castro Valley, CA weather
Today, hourly and 7-day forecast, sunrise and sunset, and the normal climate month by month
Weather in Castro Valley now
Loading the National Weather Service forecast…
Castro Valley weather by the hour
Castro Valley weather for the next 7 days
Source: National Weather Service (NOAA) · forecast for the coordinates of Castro Valley.
This week in Castro Valley
Sunrise, sunset and moon in Castro Valley
What is the weather usually like in Castro Valley?
Köppen climate classification, calculated from the 1991–2020 normals
- Septemberwarmest month · 77°F average high
- Decembercoldest month · 42°F average low
- 16.0 inprecipitation per year · 406 mm
Average high and low temperature (°F)
Average precipitation (inches)
Best time to visit Castro Valley: June to September, with mild temperatures and fewer rainy days.
Source: NOAA NCEI U.S. Climate Normals 1991–2020, station HAYWARD AIR TERMINAL, CA US (USW00093228), adjusted for the elevation of Castro Valley.
Castro Valley weather month by month
Sunrise and sunset in Castro Valley through the year
| Month | Sunrise | Sunset | Daylight |
|---|---|---|---|
| January | 7:20 AM | 5:14 PM | 9 h 54 min |
| February | 6:55 AM | 5:48 PM | 10 h 52 min |
| March | 7:17 AM | 7:16 PM | 11 h 59 min |
| April | 6:31 AM | 7:45 PM | 13 h 14 min |
| May | 5:56 AM | 8:12 PM | 14 h 15 min |
| June | 5:44 AM | 8:33 PM | 14 h 48 min |
| July | 5:57 AM | 8:31 PM | 14 h 33 min |
| August | 6:22 AM | 8:02 PM | 13 h 39 min |
| September | 6:49 AM | 7:17 PM | 12 h 28 min |
| October | 7:15 AM | 6:32 PM | 11 h 16 min |
| November | 6:47 AM | 4:58 PM | 10 h 11 min |
| December | 7:14 AM | 4:52 PM | 9 h 37 min |
Times for the 15th of each month, local time (America/Los Angeles).
What is the weather like in Castro Valley?
Castro Valley has a warm-summer mediterranean climate. The warmest month is September, with an average high of 77°F (25°C), and the coldest is December, with average lows of 42°F (6°C).
It gets about 16.0 inches (406 mm) of precipitation a year. The wettest month is December and the driest is July.
The best time to visit Castro Valley is June to September. At 164 ft of elevation, nights are mild most of the year. The live forecast on this page comes from the National Weather Service and the climate averages from NOAA’s 1991–2020 U.S. Climate Normals.
More about Castro Valley
Weather in towns near Castro Valley
Questions about the weather in Castro Valley
What is the hottest month in Castro Valley?
September, with an average high of 77°F (25°C).
What is the coldest month in Castro Valley?
December, with an average low of 42°F (6°C).
How much does it rain in Castro Valley?
About 16.0 inches (406 mm) a year; the wettest month is December.
Does it snow in Castro Valley?
Snow is very rare or not recorded at the nearest weather station.
When is the best time to visit Castro Valley?
June to September, when temperatures are most pleasant and rainy days are fewer.
What climate does Castro Valley have?
Warm-summer mediterranean (Köppen Csb).
What is the weather like in Castro Valley in November?
Highs average 65°F and lows 47°F, with about 1.5 inches of precipitation.
What time is sunrise in Castro Valley?
Around 6:47 AM in mid-November, and sunset around 4:58 PM. Today’s exact times are shown above.
Where does this Castro Valley weather forecast come from?
From the National Weather Service (NOAA), the official U.S. weather agency, for the exact coordinates of Castro Valley.
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