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.

43°F

6°C

Humidity	100%
Wind Speed	S 20 MPH
Barometer	NA
Dewpoint	43°F (6°C)
Visibility	NA
Wind Chill	34°F (1°C)
Last update	11 Apr 02:50 PM PDT

More Information:

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

Extended Forecast for

4 Miles SSE Clayton CA

Tonight
Low: 45 °F
Showers
Sunday
High: 52 °F
Showers
Sunday Night
Low: 46 °F
Chance
Showers then
Partly Cloudy
Monday
High: 57 °F
Sunny
Monday Night
Low: 48 °F
Mostly Clear
Tuesday
High: 60 °F
Sunny
Tuesday Night
Low: 47 °F
Clear
Wednesday
High: 60 °F
Sunny
Wednesday Night
Low: 50 °F
Mostly Clear

Detailed Forecast

Tonight

Showers and thunderstorms before 1am, then showers likely and possibly a thunderstorm between 1am and 4am, then a chance of showers and thunderstorms after 4am. Low around 45. South southwest wind 16 to 18 mph, with gusts as high as 33 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.

Sunday

Showers and possibly a thunderstorm, mainly before 4pm, then a chance of showers and thunderstorms after 4pm. High near 52. West southwest wind 15 to 20 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.

Sunday Night

A 30 percent chance of showers before 11pm. Partly cloudy, with a low around 46. West southwest wind 7 to 15 mph, with gusts as high as 28 mph. New precipitation amounts of less than a tenth of an inch possible.

Monday

Sunny, with a high near 57. West northwest wind 6 to 8 mph.

Monday Night

Mostly clear, with a low around 48. West southwest wind 9 to 11 mph, with gusts as high as 21 mph.

Tuesday

Sunny, with a high near 60.

Tuesday Night

Clear, with a low around 47.

Wednesday

Sunny, with a high near 60.

Wednesday Night

Mostly clear, with a low around 50.