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

Excessive Rainfall Possible This Weekend; October Heat Wave in California

A slow moving front will be the focus area for heavy to excessive rainfall and a threat for flash/urban flooding across the northern Gulf Coast and Southeast U.S. through this weekend. Abnormally hot, potentially record-breaking, temperatures will impact southern California and stretch north toward the Bay Area and Central Valley into next week. Read More >

Hazardous Weather Conditions

Current conditions at

LYONS VALLEY (COWC1)

Lat: 39.12583°NLon: 123.07333°WElev: 3355.0ft.

NA

85°F

29°C

Humidity 20%
Wind Speed WNW 8 MPH
Barometer NA
Dewpoint 40°F (4°C)
Visibility NA
Heat Index82°F (28°C)
Last update 03 Oct 06:01 PM PDT
Extended Forecast for

4 Miles NNW Hopland CA

Heat Advisory October 3, 07:03pm until October 4, 11:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory October 3, 07:03pm until October 4, 11:00pm

    NOW until 11:00pm Sun

    Heat Advisory

  • Tonight

    Low: 65 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Cloudy, then gradually becoming mostly sunny and hot, with a high near 101. Light and variable wind.

    High: 101 °F

    Hot

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 63. West northwest wind around 6 mph becoming calm in the evening.

    Low: 63 °F

    Mostly Clear

  • Monday

    Monday: Sunny and hot, with a high near 102. Calm wind becoming west southwest around 5 mph in the afternoon.

    High: 102 °F

    Hot

  • Monday Night

    Monday Night: Clear, with a low around 62. West wind 5 to 8 mph becoming light and variable in the evening.

    Low: 62 °F

    Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 101. Calm wind becoming west southwest around 6 mph in the afternoon.

    High: 101 °F

    Hot

  • Tuesday Night

    Tuesday Night: Clear, with a low around 61.

    Low: 61 °F

    Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 102.

    High: 102 °F

    Hot

Detailed Forecast

Tonight
Increasing clouds, with a low around 65. West wind around 6 mph becoming north northwest in the evening.
Sunday
Cloudy, then gradually becoming mostly sunny and hot, with a high near 101. Light and variable wind.
Sunday Night
Mostly clear, with a low around 63. West northwest wind around 6 mph becoming calm in the evening.
Monday
Sunny and hot, with a high near 102. Calm wind becoming west southwest around 5 mph in the afternoon.
Monday Night
Clear, with a low around 62. West wind 5 to 8 mph becoming light and variable in the evening.
Tuesday
Sunny and hot, with a high near 101. Calm wind becoming west southwest around 6 mph in the afternoon.
Tuesday Night
Clear, with a low around 61.
Wednesday
Sunny and hot, with a high near 102.
Wednesday Night
Clear, with a low around 60.
Thursday
Sunny and hot, with a high near 101.
Thursday Night
Mostly clear, with a low around 59.
Friday
Sunny, with a high near 90.
Friday Night
Mostly clear, with a low around 51.
Saturday
Sunny, with a high near 81.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles NNW Hopland CA
 39.03°N 123.15°W (Elev. 597 ft)
Last Update:
2:10 pm PDT Oct 3, 2026
Forecast Valid:
7pm PDT Oct 3, 2026-6pm PDT Oct 10, 2026
 
Forecast Discussion
 
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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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation