
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 elevated to critical fire weather conditions to the southern High Plains through the weekend. A winter storm will track across the Great Lakes and Northeast U.S. 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
28°F
-2°C
| Humidity | 99% |
| Wind Speed | N 0 MPH |
| Barometer | NA |
| Dewpoint | 28°F (-2°C) |
| Visibility | NA |
| Last update | 20 Feb 03:25 AM PST |
Extended Forecast for
6 Miles NE San Ramon CA
Cold Weather Advisory February 21, 01:00am until February 21, 09:00am
Tonight

Low: 36 °F
Increasing
CloudsSaturday

High: 52 °F
Decreasing
CloudsSaturday Night

Low: 42 °F
Partly Cloudy
Sunday

High: 60 °F
Mostly Sunny
Sunday Night

Low: 45 °F
Mostly Cloudy
Monday
High: 61 °F
Partly Sunny
then Chance
RainMonday Night

Low: 54 °F
Rain
Tuesday

High: 56 °F
Rain
Tuesday Night

Low: 52 °F
Rain
Detailed Forecast
Tonight
Increasing clouds, with a low around 36. South southeast wind 6 to 10 mph.
Saturday
Mostly cloudy, then gradually becoming sunny, with a high near 52. South wind 14 to 17 mph, with gusts as high as 29 mph.
Saturday Night
Partly cloudy, with a low around 42. South wind 16 to 18 mph, with gusts as high as 26 mph.
Sunday
Mostly sunny, with a high near 60. Southeast wind 14 to 20 mph, with gusts as high as 25 mph.
Sunday Night
Mostly cloudy, with a low around 45. Southwest wind around 8 mph becoming east southeast after midnight.
Monday
A 30 percent chance of rain after 4pm. Partly sunny, with a high near 61.
Monday Night
Rain, mainly after 10pm. Low around 54. Chance of precipitation is 80%.
Tuesday
Rain. Cloudy, with a high near 56.
Tuesday Night
Rain, mainly before 10pm. Cloudy, with a low around 52.
Wednesday
A chance of rain. Mostly cloudy, with a high near 58.
Wednesday Night
A chance of rain. Mostly cloudy, with a low around 50.
Thursday
A chance of rain. Partly sunny, with a high near 63.
Thursday Night
A chance of rain. Partly cloudy, with a low around 50.
Friday
A slight chance of rain. Mostly sunny, with a high near 63.
Additional Forecasts and Information
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ABOUT THIS FORECAST
Point Forecast:
6 Miles NE San Ramon CA
37.83°N 121.88°W (Elev. 1913 ft)
37.83°N 121.88°W (Elev. 1913 ft)
2:25 pm PST Feb 20, 2026
5pm PST Feb 20, 2026-6pm PST Feb 27, 2026



