National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Heavy Rain in the Ohio and Tennessee Valleys; Watching for Tropical Cyclone Development in the Atlantic

Heavy to excessive rainfall may bring areas of flash and urban flooding over portions of the Ohio and Tennessee Valleys. A tropical wave over the northeastern Caribbean Sea is being monitored for tropical cyclone formation within the next few days which is bringing periods of heavy rain, thunderstorms, flood risk, and landslides to Puerto Rico and the US Virgin Islands. Read More >

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

Lat: 37.881699°NLon: 121.914173°WElev: 3904.0ft.

NA

64°F

18°C

Humidity 64%
Wind Speed SSE 13 MPH
Barometer NA
Dewpoint 51°F (11°C)
Visibility NA
Last update 24 Sep 04:35 PM PDT
Extended Forecast for

3 Miles ESE Danville CA

  • This Afternoon

    This Afternoon: A chance of showers and thunderstorms before 5pm, then a slight chance of showers. Mostly cloudy, with a high near 82. West wind around 7 mph. Chance of precipitation is 30%.

    High: 82 °F

    Chance
    Showers

  • Tonight

    Tonight: A slight chance of showers before 8pm, then a chance of showers and thunderstorms between 8pm and 11pm, then a slight chance of showers after 11pm. Mostly cloudy, with a low around 62. Calm wind. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 62 °F

    Chance
    Showers

  • Thursday

    Thursday: Mostly sunny, with a high near 82. Calm wind becoming west southwest 5 to 7 mph in the afternoon.

    High: 82 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 57. West southwest wind 5 to 8 mph becoming calm in the evening.

    Low: 57 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 89. Calm wind becoming west around 6 mph in the afternoon.

    High: 89 °F

    Sunny

  • Friday Night

    Friday Night: Clear, with a low around 58.

    Low: 58 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 82.

    High: 82 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 58.

    Low: 58 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 77.

    High: 77 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
A chance of showers and thunderstorms before 5pm, then a slight chance of showers. Mostly cloudy, with a high near 82. West wind around 7 mph. Chance of precipitation is 30%.
Tonight
A slight chance of showers before 8pm, then a chance of showers and thunderstorms between 8pm and 11pm, then a slight chance of showers after 11pm. Mostly cloudy, with a low around 62. Calm wind. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday
Mostly sunny, with a high near 82. Calm wind becoming west southwest 5 to 7 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 57. West southwest wind 5 to 8 mph becoming calm in the evening.
Friday
Sunny, with a high near 89. Calm wind becoming west around 6 mph in the afternoon.
Friday Night
Clear, with a low around 58.
Saturday
Sunny, with a high near 82.
Saturday Night
Mostly clear, with a low around 58.
Sunday
Mostly sunny, with a high near 77.
Sunday Night
Partly cloudy, with a low around 58.
Monday
A chance of rain. Partly sunny, with a high near 77.
Monday Night
A chance of rain. Mostly cloudy, with a low around 58.
Tuesday
A chance of rain. Partly sunny, with a high near 76.
Tuesday Night
A chance of rain. Partly cloudy, with a low around 54.
Wednesday
A slight chance of rain. Sunny, with a high near 79.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles ESE Danville CA
 37.8°N 121.96°W (Elev. 604 ft)
Last Update:
3:20 pm PDT Sep 24, 2025
Forecast Valid:
4pm PDT Sep 24, 2025-6pm PDT Oct 1, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation