Weather forecast for tomorrowCastro Valley, CA
Weather forecast for tomorrow
Monday Oct 19, 2026
- 64°F
- 52°F
Mostly Cloudy
- Precip. probability: 17%
- Precipitation: 0"
- Wind: 13mphW 265°
- Humidity: 62%
- UV index: 5
- Sunrise: 7:20 am PDT
- Sunset: 6:25 pm PDT
- details ▼
Tomorrow, in Castro Valley, prepare for a dull and mostly gray sky.
The temperature variation is anticipated to range from a maximum of a comfortable 64.4°F to a minimum of a fresh 51.8°F.
The forecast high of 64.4°F is more in line with November's average of 63.5°F than October's 72.5°F.
Sunrise will be at 7:20 am and sunset at 6:25 pm; tomorrow's daylight will last for 11h and 5min.
The temperature variation is anticipated to range from a maximum of a comfortable 64.4°F to a minimum of a fresh 51.8°F.
The forecast high of 64.4°F is more in line with November's average of 63.5°F than October's 72.5°F.
Sunrise will be at 7:20 am and sunset at 6:25 pm; tomorrow's daylight will last for 11h and 5min.
Hourly overview
Hourly temperatures
Warmest hour: 3 pm 64°C.
Coldest period: 3 am - 6 am 55°C.
Coldest period: 3 am - 6 am 55°C.
Chance of precipitation
Highest chance: 9 am 16%.
Hourly weather forecast
- 12 am
- 57°F
- Feels like:55°F
Partly Cloudy
- Precip. probability: 15%
- Precipitation: 0"
- Wind: 8mphW 259°
- Humidity: 81%
- Pressure: 30"Hg
- Visibility: 9mi
- UV index: 0
- details ▼
- 2 am
- 57°F
- Feels like:55°F
Mostly Cloudy
- Precip. probability: 10%
- Precipitation: 0"
- Wind: 8mphW 259°
- Humidity: 81%
- Pressure: 29.97"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
- 4 am
- 55°F
- Feels like:54°F
Mostly Cloudy
- Precip. probability: 9%
- Precipitation: 0"
- Wind: 8mphWSW 248°
- Humidity: 80%
- Pressure: 29.97"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
- 6 am
- 55°F
- Feels like:54°F
Mostly Cloudy
- Precip. probability: 15%
- Precipitation: 0"
- Wind: 7mphWSW 256°
- Humidity: 77%
- Pressure: 29.97"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
Sunrise: 7:20 am
- 8 am
- 55°F
- Feels like:54°F
Mostly Cloudy
- Precip. probability: 17%
- Precipitation: 0"
- Wind: 7mphWSW 256°
- Humidity: 77%
- Pressure: 29.97"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
- 10 am
- 59°F
- Feels like:57°F
Partly Cloudy
- Precip. probability: 5%
- Precipitation: 0"
- Wind: 8mphWSW 256°
- Humidity: 67%
- Pressure: 30"Hg
- Visibility: 10mi
- UV index: 2
- details ▼
- 12 pm
- 61°F
- Feels like:61°F
Partly Cloudy
- Precip. probability: 2%
- Precipitation: 0"
- Wind: 10mphWSW 257°
- Humidity: 60%
- Pressure: 29.97"Hg
- Visibility: 10mi
- UV index: 4
- details ▼
- 2 pm
- 64°F
- Feels like:63°F
Partly Cloudy
- Precip. probability: 3%
- Precipitation: 0"
- Wind: 12mphW 272°
- Humidity: 51%
- Pressure: 29.91"Hg
- Visibility: 10mi
- UV index: 4
- details ▼
- 4 pm
- 63°F
- Feels like:61°F
Mostly Cloudy
- Precip. probability: 2%
- Precipitation: 0"
- Wind: 13mphW 278°
- Humidity: 53%
- Pressure: 29.88"Hg
- Visibility: 10mi
- UV index: 1
- details ▼
- 6 pm
- 61°F
- Feels like:59°F
Cloudy
- Precip. probability: 2%
- Precipitation: 0"
- Wind: 12mphWNW 282°
- Humidity: 61%
- Pressure: 29.88"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
Sunset: 6:25 pm
- 8 pm
- 57°F
- Feels like:55°F
Cloudy
- Precip. probability: 4%
- Precipitation: 0"
- Wind: 7mphWNW 285°
- Humidity: 70%
- Pressure: 29.88"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
- 10 pm
- 55°F
- Feels like:55°F
Cloudy
- Precip. probability: 5%
- Precipitation: 0"
- Wind: 5mphWNW 285°
- Humidity: 75%
- Pressure: 29.88"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
Tomorrow, a combination of cloud-filled and bright weather is anticipated.
The temperature will be between the lowest temperature of 55.4°F and the highest temperature of 64.4°F. The warmest part of the day will be at 2 pm and 3 pm.
The expected temperature aligns more with November's average high than with October's 72.5°F. The temperature low is forecasted to be in line with the usual October value of 54.3°F.
The temperature will be between the lowest temperature of 55.4°F and the highest temperature of 64.4°F. The warmest part of the day will be at 2 pm and 3 pm.
The expected temperature aligns more with November's average high than with October's 72.5°F. The temperature low is forecasted to be in line with the usual October value of 54.3°F.
Updated: Oct 18, 2026 @ 07:26:21 UTC
Published by: Weather U.S. | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate
Frequently asked questions
Tomorrow, in Castro Valley, clouds will blanket the sky, reducing sunshine.
Tomorrow, the highest temperature will be 64.4°F, while the lowest temperature will be 51.8°F.
The highest temperature will be a few degrees lower than the average maximum of 72.5°F in October. The lowest temperature will be in line with the average low of 54.3°F.
The highest temperature will be a few degrees lower than the average maximum of 72.5°F in October. The lowest temperature will be in line with the average low of 54.3°F.
On Monday, in Castro Valley, sunrise will be at 7:20 am and sunset at 6:25 pm (PDT).
Tomorrow, the daylight will last for 11h and 5min.
