
Critical Fire Weather in the Southern High Plains; Heavy Snow in the Great Lakes and Northeast U.S.
Gusty winds and low relative humidity will bring critical fire weather to the southern High Plains Friday. A winter storm will track across the Great Lakes and Northeast U.S. Friday into Saturday with areas of wintry mix and heavy snow from northern New York through southern Maine. Read More >
Hazardous Weather Conditions
Current conditions at
SJSU - Mount Diablo Summit Museum Rooftop (SJS02)
Lat: 37.881699°NLon: 121.914173°WElev: 3904.0ft.NA
30°F
-1°C
| Humidity | 100% |
| Wind Speed | N 0 MPH |
| Barometer | NA |
| Dewpoint | 30°F (-1°C) |
| Visibility | NA |
| Last update | 19 Feb 07:50 PM PST |
Extended Forecast for
4 Miles SSE Clayton CA
Extreme Cold Warning February 20, 01:00am until February 20, 09:00am
Tonight

Low: 31 °F
Mostly Clear
Friday

High: 42 °F
Mostly Sunny
Friday Night

Low: 38 °F
Partly Cloudy
Saturday

High: 51 °F
Mostly Sunny
Saturday Night

Low: 46 °F
Slight Chance
RainSunday

High: 58 °F
Chance Rain
Sunday Night

Low: 50 °F
Chance Rain
Monday

High: 60 °F
Chance Rain
Monday Night

Low: 54 °F
Rain
Detailed Forecast
Tonight
Mostly clear, with a low around 31. West northwest wind 8 to 17 mph, with gusts as high as 31 mph.
Friday
Mostly sunny, with a high near 42. South southeast wind around 6 mph becoming west southwest in the afternoon.
Friday Night
Partly cloudy, with a steady temperature around 38. Southeast wind 7 to 9 mph.
Saturday
Mostly sunny, with a high near 51. South southeast wind 13 to 15 mph, with gusts as high as 28 mph.
Saturday Night
A 20 percent chance of rain after 10pm. Partly cloudy, with a low around 46. South southeast wind around 18 mph, with gusts as high as 34 mph. New precipitation amounts of less than a tenth of an inch possible.
Sunday
A 40 percent chance of rain. Partly sunny, with a high near 58. New precipitation amounts of less than a tenth of an inch possible.
Sunday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 50.
Monday
A chance of rain. Partly sunny, with a high near 60.
Monday Night
Rain. Mostly cloudy, with a low around 54.
Tuesday
Rain. Mostly cloudy, with a high near 57.
Tuesday Night
Rain. Cloudy, with a low around 52.
Wednesday
Rain likely. Mostly cloudy, with a high near 56.
Wednesday Night
A chance of rain. Mostly cloudy, with a low around 50.
Thursday
A chance of rain. Mostly sunny, with a high near 58.
Additional Forecasts and Information
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ABOUT THIS FORECAST
Point Forecast:
4 Miles SSE Clayton CA
37.87°N 121.92°W (Elev. 2818 ft)
37.87°N 121.92°W (Elev. 2818 ft)
12:26 pm PST Feb 19, 2026
8pm PST Feb 19, 2026-6pm PST Feb 26, 2026



