Hawaii and Guam Concerns; Record Warmth Spreads Eastward; Heavy Snow for Sierra-Nevada; Severe Weather for the Plains

A very active spring pattern with tropical concerns across the Pacific. Heavy rainfall will continue to impact Hawaii this weekend. Meanwhile we continue to monitor a developing typhoon that may affect Guam into early next week. For the Lower 48, heavy snow for mountains of California this weekend, increase threat for severe thunderstorms next week for the Plains and record warmth spreads east. Read More >

Current conditions at

San Jose / Reid / Hillv (KRHV)

Lat: 37.33333°NLon: 121.81667°WElev: 135.0ft.

Rain

59°F

15°C

Humidity 77%
Wind Speed SSE 6 MPH
Barometer 29.89 in (1012.19 mb)
Dewpoint 52°F (11°C)
Visibility 2.00 mi
Last update 10 Apr 09:47 PM PDT
Extended Forecast for

Mount Hamilton CA

  • Overnight

    Overnight: A 30 percent chance of rain, mainly before 2am.  Mostly cloudy, with a steady temperature around 49. South southwest wind around 9 mph.  New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 49 °F

    Chance Rain

  • Saturday

    Saturday: A chance of rain and thunderstorms before 4pm, then rain likely between 4pm and 5pm, then showers likely after 5pm.  Mostly cloudy, with a high near 50. South wind 11 to 17 mph, with gusts as high as 30 mph.  Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

    High: 50 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: Rain and thunderstorms. Some of the storms could produce heavy rainfall.  Low around 40. South southwest wind 14 to 18 mph, with gusts as high as 34 mph.  Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.

    Low: 40 °F

    Heavy Rain

  • Sunday

    Sunday: Rain before 8am, then showers and possibly a thunderstorm after 8am.  High near 46. South southwest wind 14 to 16 mph, with gusts as high as 28 mph.  Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    High: 46 °F

    Showers

  • Sunday Night

    Sunday Night: A 40 percent chance of rain before 11pm.  Mostly cloudy, with a low around 40. West southwest wind 5 to 10 mph becoming light southwest  after midnight. Winds could gust as high as 21 mph.  New precipitation amounts of less than a tenth of an inch possible.

    Low: 40 °F

    Chance Rain
    then Mostly
    Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 52.

    High: 52 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 40.

    Low: 40 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 57.

    High: 57 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 40.

    Low: 40 °F

    Mostly Clear

Detailed Forecast

Overnight
A 30 percent chance of rain, mainly before 2am. Mostly cloudy, with a steady temperature around 49. South southwest wind around 9 mph. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday
A chance of rain and thunderstorms before 4pm, then rain likely between 4pm and 5pm, then showers likely after 5pm. Mostly cloudy, with a high near 50. South wind 11 to 17 mph, with gusts as high as 30 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Saturday Night
Rain and thunderstorms. Some of the storms could produce heavy rainfall. Low around 40. South southwest wind 14 to 18 mph, with gusts as high as 34 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.
Sunday
Rain before 8am, then showers and possibly a thunderstorm after 8am. High near 46. South southwest wind 14 to 16 mph, with gusts as high as 28 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Sunday Night
A 40 percent chance of rain before 11pm. Mostly cloudy, with a low around 40. West southwest wind 5 to 10 mph becoming light southwest after midnight. Winds could gust as high as 21 mph. New precipitation amounts of less than a tenth of an inch possible.
Monday
Mostly sunny, with a high near 52.
Monday Night
Mostly clear, with a low around 40.
Tuesday
Sunny, with a high near 57.
Tuesday Night
Mostly clear, with a low around 40.
Wednesday
Sunny, with a high near 56.
Wednesday Night
Partly cloudy, with a low around 42.
Thursday
Sunny, with a high near 58.
Thursday Night
Clear, with a low around 44.
Friday
Sunny, with a high near 65.
Basemap Options
Click map to change the forecast location
Loading map...

ABOUT THIS FORECAST

 
Point Forecast:
Mount Hamilton CA
 37.35°N 121.64°W (Elev. 2398 ft)
1:26 am PDT Apr 11, 2026
1am PDT Apr 11, 2026-6pm PDT Apr 17, 2026
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database