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

DIABLO GRANDE (DBLC1)

Lat: 37.32927°NLon: 121.29538°WElev: 1861.0ft.

NA

82°F

28°C

Humidity 18%
Wind Speed ENE 8 MPH
Barometer NA
Dewpoint 34°F (1°C)
Visibility NA
Heat Index80°F (27°C)
Last update 18 Oct 04:00 PM PDT
Extended Forecast for

20 Miles E Mount Hamilton CA

  • Tonight

    Tonight: Mostly clear, with a low around 52. North wind around 5 mph becoming calm in the evening.

    Low: 52 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 71. Light and variable wind becoming east 5 to 8 mph in the morning.

    High: 71 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Increasing clouds, with a low around 49. North northeast wind around 6 mph becoming calm in the evening.

    Low: 49 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Partly sunny, with a high near 67. Calm wind becoming east southeast 5 to 7 mph in the afternoon.

    High: 67 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Rain likely, mainly after 11pm. Mostly cloudy, with a low around 54. North northeast wind around 5 mph becoming light and variable. Chance of precipitation is 60%.

    Low: 54 °F

    Rain Likely

  • Wednesday

    Wednesday: Rain likely. Mostly cloudy, with a high near 64. Chance of precipitation is 70%.

    High: 64 °F

    Rain Likely

  • Wednesday Night

    Wednesday Night: A 50 percent chance of rain. Mostly cloudy, with a low around 51.

    Low: 51 °F

    Chance Rain

  • Thursday

    Thursday: A chance of rain, mainly after 11am. Partly sunny, with a high near 66.

    High: 66 °F

    Chance Rain

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 50.

    Low: 50 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 52. North wind around 5 mph becoming calm in the evening.
Monday
Mostly sunny, with a high near 71. Light and variable wind becoming east 5 to 8 mph in the morning.
Monday Night
Increasing clouds, with a low around 49. North northeast wind around 6 mph becoming calm in the evening.
Tuesday
Partly sunny, with a high near 67. Calm wind becoming east southeast 5 to 7 mph in the afternoon.
Tuesday Night
Rain likely, mainly after 11pm. Mostly cloudy, with a low around 54. North northeast wind around 5 mph becoming light and variable. Chance of precipitation is 60%.
Wednesday
Rain likely. Mostly cloudy, with a high near 64. Chance of precipitation is 70%.
Wednesday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 51.
Thursday
A chance of rain, mainly after 11am. Partly sunny, with a high near 66.
Thursday Night
Partly cloudy, with a low around 50.
Friday
Sunny, with a high near 67.
Friday Night
Clear, with a low around 49.
Saturday
Sunny, with a high near 70.
Saturday Night
Mostly clear, with a low around 50.
Sunday
A slight chance of rain. Sunny, with a high near 67.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
20 Miles E Mount Hamilton CA
 37.38°N 121.28°W (Elev. 1401 ft)
Last Update:
2:00 pm PDT Oct 18, 2026
Forecast Valid:
5pm PDT Oct 18, 2026-6pm PDT Oct 25, 2026
 
Forecast Discussion
 
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Additional Resources

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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