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

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

Lat: 37.881699°NLon: 121.914173°WElev: 3904.0ft.

46°F

8°C

Humidity	99%
Wind Speed	SSW 11 MPH
Barometer	NA
Dewpoint	45°F (7°C)
Visibility	NA
Wind Chill	41°F (5°C)
Last update	10 Apr 05:50 PM PDT

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

3 Miles S Clayton CA

Tonight
Low: 50 °F
Rain Likely
then Chance
Rain
Saturday
High: 52 °F
Showers
Saturday Night
Low: 46 °F
Showers and
Breezy
Sunday
High: 52 °F
Showers
Sunday Night
Low: 47 °F
Chance Rain
then Partly
Cloudy
Monday
High: 57 °F
Mostly Sunny
Monday Night
Low: 47 °F
Mostly Clear
Tuesday
High: 60 °F
Sunny
Tuesday Night
Low: 47 °F
Mostly Clear

Detailed Forecast

Tonight

Rain likely, mainly before 3am. Mostly cloudy, with a low around 50. South southwest wind 10 to 13 mph, with gusts as high as 24 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

Saturday

Rain and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms between 1pm and 4pm, then showers likely and possibly a thunderstorm after 4pm. Steady temperature around 52. South wind 13 to 21 mph, with gusts as high as 37 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

Saturday Night

Showers and possibly a thunderstorm before 5am, then rain after 5am. Low around 46. Breezy, with a south southwest wind 15 to 22 mph, with gusts as high as 37 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 52. South southwest wind 16 to 18 mph, with gusts as high as 36 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. Partly cloudy, with a low around 47. Southwest wind 7 to 15 mph, with gusts as high as 26 mph. New precipitation amounts of less than a tenth of an inch possible.

Monday

Mostly sunny, with a high near 57.

Monday Night

Mostly clear, with a low around 47.

Tuesday

Sunny, with a high near 60.

Tuesday Night

Mostly clear, with a low around 47.

Wednesday

Sunny, with a high near 62.

Wednesday Night

Partly cloudy, with a low around 48.