Rapid Warm-Up Forecast Across Much of the Lower 48 Today and Tuesday
Most of the U.S. starts the week calm and unseasonably warm. The Heartland will be warmest, with highs 25–30° above average. Only the Gulf Coast stays chilly. Rain today is limited to western Washington while lake effect snow continues east of Lake Ontario. Cooler air returns after Tuesday, bringing a wintry mix to the Midwest and Northeast by Wednesday. Read More >
Current conditions at
SJSU - Mount Diablo Summit Museum Rooftop (SJS02)
Lat: 37.881699°NLon: 121.914173°WElev: 3904.0ft.NA
53°F
12°C
| Humidity | 25% |
| Wind Speed | N 7 MPH |
| Barometer | NA |
| Dewpoint | 19°F (-7°C) |
| Visibility | NA |
| Last update | 12 Jan 06:50 AM PST |
Extended Forecast for
4 Miles SSE Clayton CA
Today
High: 54 °F
Sunny
Tonight
Low: 48 °F
Clear
Tuesday
High: 54 °F
Sunny
Tuesday Night
Low: 41 °F
Mostly Clear
Wednesday
High: 54 °F
Sunny
Wednesday Night
Low: 42 °F
Mostly Clear
Thursday
High: 56 °F
Sunny
Thursday Night
Low: 43 °F
Mostly Clear
Friday
High: 56 °F
Sunny
Detailed Forecast
Today
Sunny, with a high near 54. North northeast wind around 7 mph.
Tonight
Clear, with a steady temperature around 48. East wind 5 to 7 mph.
Tuesday
Sunny, with a high near 54. Northeast wind 7 to 9 mph.
Tuesday Night
Mostly clear, with a low around 41. Northeast wind around 6 mph.
Wednesday
Sunny, with a high near 54. Northeast wind around 7 mph.
Wednesday Night
Mostly clear, with a low around 42.
Thursday
Sunny, with a high near 56.
Thursday Night
Mostly clear, with a low around 43.
Friday
Sunny, with a high near 56.
Friday Night
Mostly clear, with a low around 42.
Saturday
Mostly sunny, with a high near 56.
Saturday Night
Partly cloudy, with a low around 42.
Sunday
Mostly sunny, with a high near 56.
Additional Forecasts and Information
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Forecast AreaABOUT 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 am PST Jan 12, 2026
7am PST Jan 12, 2026-6pm PST Jan 18, 2026
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