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Castro Valley Weather Today

Temperature, Feels Like, Rain Chance & Hourly Forecast in Castro Valley

Castro Valley temperature today is 31°, feels like 30°, with a humidity level of 39% and wind at 1.62 km/h. Rain chance today is 0%. Use the hourly forecast and 5-day outlook below to plan your day.

Tomorrow in Castro Valley: expect a high of 34° and a low of 18°, with broken clouds.

clear sky
31°
clear sky
H: 33° L: 26°
Feels like 30°
AQI: Moderate (3/5)
Castro Valley
Weather Updated Oct 4, 2026 12:35 AM
Humidity
39%
Dew 15°
Wind speed
1.62 km/h
W
Pressure
1012 hPa
Visibility
10 km
High Temperature
Temperature is 31°. Consider staying indoors during peak hours.
Weather Summary
Currently in Castro Valley, expect varied conditions with hot temperatures around 31°. Winds are calm winds. Stay hydrated and seek shade during peak hours.
Sat
clear sky
33° 22°
Sun
broken clouds
34° 18°
Mon
clear sky
31° 18°
Tue
clear sky
32° 19°
Wed
clear sky
29° 16°
Daily Weather Forecast
Saturday
10/03/2026
clear sky
22°
33°
Sunday
10/04/2026
broken clouds
18°
34°
Monday
10/05/2026
clear sky
18°
31°
Tuesday
10/06/2026
clear sky
19°
32°
Wednesday
10/07/2026
clear sky
16°
29°
Precipitation Probability
0%
14
0%
17
0%
20
0%
23
0%
02
0%
05
0%
08
0%
11
0%
14
0%
17
0%
20
0%
23
0%
02
0%
05
0%
08
0%
11
Evolution
Daily Weather Forecast Evolution (°C)
Lowest temperature
Highest temperature
Temperature Forecast (48h)
31°
Sat
14:00
33°
 
26°
 
22°
 
20°
Sun
02:00
18°
 
20°
 
31°
 
34°
Sun
14:00
33°
 
25°
 
21°
 
18°
Mon
02:00
18°
 
19°
 
27°
 
Hot (≥30°)
Warm
Cool
Cold (<0°)
Weather Map
Sun & Moon
Sunrise
Sunrise
07:05
Sunset
Sunset
18:48
Moon Phase
Last Quarter (43%)
Timezone: GMT+05:30
Last updated: Oct 4, 2026 12:35 AM · Data refreshes every 5 min
Location Info
Latitude
Latitude
37.694099
Longitude
Longitude
-122.086349
Embed This Weather

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More about Castro Valley
Content curated by the NearWeather editorial team · Updated periodically
Castro Valley is an unincorporated community located in Alameda County, California. It is situated in the San Francisco Bay Area, about 25 miles east of San Francisco. The climate in Castro Valley is mild throughout the year, with warm temperatures in the summer and cool temperatures in the winter. Average temperatures range from highs of 68ºF (20ºC) in the summer to lows of 45ºF (7ºC) in the winter. Precipitation is evenly distributed throughout the year, with an average of 28 inches (71 cm) of rain annually.
Weather data sourced from OpenWeatherMap. Forecasts are estimates and may differ from actual conditions. For severe weather, consult your local meteorological authority.
FAQ's about Castro Valley
What is the temperature in Castro Valley right now?

The current temperature in Castro Valley is 31°, and it feels like 30°. Today's high is 33° and the low is 26°.

Will it rain in Castro Valley today?

No rain is expected in Castro Valley today (0% chance). Conditions are currently clear sky.

What is the weather in Castro Valley today?

Castro Valley is experiencing clear sky with a temperature of 31°. Humidity is at 39% and wind speed is 1.62 km/h from the W.

What is the humidity in Castro Valley today?

Humidity in Castro Valley is 39% right now, with a dew point of 15°. Comfort levels are moderate.

What is the wind speed in Castro Valley today?

Wind speed in Castro Valley is 1.62 km/h, flowing at 272° W wind direction.

What is the 5-day forecast for Castro Valley?

NearWeather provides a detailed 5-day forecast and 48-hour hourly forecast for Castro Valley. Today's high is 33° and low is 26°, with a 0% chance of rain. Scroll up to view the full day-by-day and hourly breakdown.

What does it feel like in Castro Valley today?

It feels like 30° in Castro Valley today, with 9% cloud cover and 10 km visibility.

Weather in Castro Valley
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