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

Heavy Rainfall in the Southwest and Southeast This Weekend; Monitoring Tropical Cyclone Formation Which Could Impact the Southeast U.S.

Heavy rainfall from monsoon thunderstorms may bring isolated flash and urban flooding to the Desert Southwest. A near-stationary front will bring numerous showers and thunderstorms to much of the Mid-Atlantic and Southeast. Tropical wave (AL94) is likely to become a depression. Significant uncertainty remains in the track and intensity, but chances for impacts to the Southeast are increasing. Read More >

Current conditions at

Nevada County Air Park (KGOO)

Lat: 39.224028°NLon: 121.003083°WElev: 3154.0ft.

Clear

70°F

21°C

Humidity 35%
Wind Speed N 0 MPH
Barometer 29.96 in (1014.56 mb)
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Last update 26 Sep 08:15 AM PDT
Extended Forecast for

Grass Valley CA

  • Today

    Today: Sunny, with a high near 88. East northeast wind around 5 mph becoming calm in the afternoon.

    High: 88 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 61. Light and variable wind becoming east southeast around 6 mph.

    Low: 61 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 84. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 84 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 56. Southwest wind around 5 mph becoming calm in the evening.

    Low: 56 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 73. Calm wind becoming south southwest around 6 mph in the afternoon.

    High: 73 °F

    Sunny

  • Sunday Night

    Sunday Night: A 20 percent chance of showers after 11pm. Mostly cloudy, with a low around 54.

    Low: 54 °F

    Slight Chance
    Showers

  • Monday

    Monday: A chance of showers, with thunderstorms also possible after 11am. Mostly cloudy, with a high near 65. Chance of precipitation is 50%.

    High: 65 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 52.

    Low: 52 °F

    Showers
    Likely

  • Tuesday

    Tuesday: Showers likely, with thunderstorms also possible after 11am. Mostly cloudy, with a high near 61.

    High: 61 °F

    Showers
    Likely

Detailed Forecast

Today
Sunny, with a high near 88. East northeast wind around 5 mph becoming calm in the afternoon.
Tonight
Clear, with a low around 61. Light and variable wind becoming east southeast around 6 mph.
Saturday
Sunny, with a high near 84. Calm wind becoming southwest around 5 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 56. Southwest wind around 5 mph becoming calm in the evening.
Sunday
Sunny, with a high near 73. Calm wind becoming south southwest around 6 mph in the afternoon.
Sunday Night
A 20 percent chance of showers after 11pm. Mostly cloudy, with a low around 54.
Monday
A chance of showers, with thunderstorms also possible after 11am. Mostly cloudy, with a high near 65. Chance of precipitation is 50%.
Monday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 52.
Tuesday
Showers likely, with thunderstorms also possible after 11am. Mostly cloudy, with a high near 61.
Tuesday Night
A chance of showers. Mostly cloudy, with a low around 51.
Wednesday
A chance of showers. Mostly sunny, with a high near 65.
Wednesday Night
Mostly clear, with a low around 50.
Thursday
Sunny, with a high near 71.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Grass Valley CA
 39.23°N 121.05°W (Elev. 2657 ft)
Last Update:
5:21 am PDT Sep 26, 2025
Forecast Valid:
8am PDT Sep 26, 2025-6pm PDT Oct 2, 2025
 
Forecast Discussion
 
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Additional Resources

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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