Heavy Rainfall and Severe Thunderstorm Threats; Heat Risk Expands; Monitoring the Tropics

Flash flooding risks continue for portions of the Four Corners and Great Basin through today. Severe thunderstorms are outlooked from the eastern Great Lakes, southern New England into the mid-Atlantic through Tuesday. Heat risk increases and expands across the center of the nation and across the Ohio Valley and mid-Atlantic this week. Continue to closely monitor tropical development in the Gulf. Read More >

Current conditions at

Nevada County Air Park (KGOO)

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

Overcast

68°F

20°C

Humidity 34%
Wind Speed N 0 MPH
Barometer 29.94 in (1013.89 mb)
Dewpoint 39°F (4°C)
Visibility 10.00 mi
Last update 31 Aug 03:55 AM PDT
Extended Forecast for

Grass Valley CA

  • Today

    Today: Patchy smoke after 5pm. Sunny, with a high near 82. Calm wind becoming south southwest around 6 mph in the afternoon.

    High: 82 °F

    Sunny then
    Patchy Smoke

  • Tonight

    Tonight: Patchy smoke before 7pm. Mostly clear, with a low around 49. South wind around 5 mph becoming calm  in the evening.

    Low: 49 °F

    Patchy Smoke
    then Mostly
    Clear

  • Tuesday

    Tuesday: Patchy smoke after 3pm. Sunny, with a high near 70. Calm wind becoming south 5 to 7 mph in the morning.

    High: 70 °F

    Sunny then
    Patchy Smoke

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 47. South southwest wind 5 to 7 mph becoming calm  in the evening.

    Low: 47 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 71. Calm wind becoming southwest around 6 mph in the afternoon.

    High: 71 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 49.

    Low: 49 °F

    Mostly Clear

  • Thursday

    Thursday: A 20 percent chance of rain after 11am.  Mostly sunny, with a high near 72.

    High: 72 °F

    Slight Chance
    Rain

  • Thursday Night

    Thursday Night: A slight chance of rain.  Partly cloudy, with a low around 52.

    Low: 52 °F

    Slight Chance
    Rain

  • Friday

    Friday: A slight chance of rain.  Sunny, with a high near 74.

    High: 74 °F

    Slight Chance
    Rain

Detailed Forecast

Today
Patchy smoke after 5pm. Sunny, with a high near 82. Calm wind becoming south southwest around 6 mph in the afternoon.
Tonight
Patchy smoke before 7pm. Mostly clear, with a low around 49. South wind around 5 mph becoming calm in the evening.
Tuesday
Patchy smoke after 3pm. Sunny, with a high near 70. Calm wind becoming south 5 to 7 mph in the morning.
Tuesday Night
Mostly clear, with a low around 47. South southwest wind 5 to 7 mph becoming calm in the evening.
Wednesday
Sunny, with a high near 71. Calm wind becoming southwest around 6 mph in the afternoon.
Wednesday Night
Mostly clear, with a low around 49.
Thursday
A 20 percent chance of rain after 11am. Mostly sunny, with a high near 72.
Thursday Night
A slight chance of rain. Partly cloudy, with a low around 52.
Friday
A slight chance of rain. Sunny, with a high near 74.
Friday Night
Mostly clear, with a low around 51.
Saturday
Sunny, with a high near 76.
Saturday Night
Mostly clear, with a low around 53.
Sunday
Sunny, with a high near 78.
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ABOUT THIS FORECAST

 
Point Forecast:
Grass Valley CA
 39.23°N 121.05°W (Elev. 2657 ft)
2:01 am PDT Aug 31, 2026
4am PDT Aug 31, 2026-6pm PDT Sep 6, 2026
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database