Current conditions at
SJSU - Mount Diablo Summit Museum Rooftop (SJS02)
Lat: 37.881699°NLon: 121.914173°WElev: 3904.0ft.NA
41°F
5°C
| Humidity | 99% |
| Wind Speed | SSW 6 MPH |
| Barometer | NA |
| Dewpoint | 41°F (5°C) |
| Visibility | NA |
| Wind Chill | 37°F (3°C) |
| Last update | 21 Apr 01:20 AM PDT |
Extended Forecast for
4 Miles S Clayton CA
Overnight

Low: 49 °F
Rain
Tuesday

High: 59 °F
Showers
Tuesday Night

Low: 44 °F
Chance Rain
Wednesday

High: 62 °F
Chance Rain
Wednesday Night

Low: 41 °F
Mostly Clear
Thursday

High: 68 °F
Sunny
Thursday Night

Low: 44 °F
Partly Cloudy
Friday

High: 70 °F
Mostly Sunny
Friday Night

Low: 47 °F
Partly Cloudy
Detailed Forecast
Overnight
Rain, mainly before 5am, then showers after 5am. Low around 49. South wind around 9 mph, with gusts as high as 21 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Tuesday
Showers and possibly a thunderstorm before 4pm, then a chance of showers and thunderstorms between 4pm and 5pm, then rain likely and possibly a thunderstorm after 5pm. High near 59. Southwest wind 8 to 14 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Tuesday Night
A chance of rain before 11pm, then a chance of rain after 2am. Mostly cloudy, with a low around 44. Southwest wind 10 to 13 mph, with gusts as high as 24 mph. Chance of precipitation is 50%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday
A 30 percent chance of rain, mainly before 11am. Mostly sunny, with a high near 62. South southwest wind 7 to 9 mph. New precipitation amounts of less than a tenth of an inch possible.
Wednesday Night
Mostly clear, with a low around 41. West wind 7 to 9 mph.
Thursday
Sunny, with a high near 68.
Thursday Night
Partly cloudy, with a low around 44.
Friday
Mostly sunny, with a high near 70.
Friday Night
Partly cloudy, with a low around 47.
Saturday
Partly sunny, with a high near 65.
Saturday Night
Partly cloudy, with a low around 47.
Sunday
Mostly sunny, with a high near 67.
Sunday Night
Partly cloudy, with a low around 46.
Monday
Mostly sunny, with a high near 69.
Additional Forecasts and Information
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ABOUT THIS FORECAST
Point Forecast:
4 Miles S Clayton CA
37.87°N 121.95°W (Elev. 1509 ft)
37.87°N 121.95°W (Elev. 1509 ft)
12:31 am PDT Apr 21, 2026
3am PDT Apr 21, 2026-6pm PDT Apr 27, 2026


