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.

38°F

3°C

Humidity	100%
Wind Speed	SSW 14 MPH
Barometer	NA
Dewpoint	38°F (3°C)
Visibility	NA
Wind Chill	30°F (-1°C)
Last update	12 Apr 01:00 AM PDT

More Information:

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

Extended Forecast for

4 Miles S Clayton CA

Overnight
Low: 41 °F
Chance
Showers and
Breezy
Sunday
High: 46 °F
Showers and
Breezy
Sunday Night
Low: 42 °F
Chance
Showers then
Partly Cloudy
Monday
High: 54 °F
Mostly Sunny
Monday Night
Low: 46 °F
Mostly Clear
Tuesday
High: 56 °F
Sunny
Tuesday Night
Low: 45 °F
Mostly Clear
Wednesday
High: 55 °F
Mostly Sunny
Wednesday Night
Low: 49 °F
Partly Cloudy

Detailed Forecast

Overnight

A chance of showers and thunderstorms. Mostly cloudy, with a low around 41. Breezy, with a south southwest wind 20 to 22 mph, with gusts as high as 43 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Sunday

Showers and possibly a thunderstorm, mainly before 4pm, then a chance of showers and thunderstorms after 4pm. High near 46. Breezy, with a southwest wind 18 to 25 mph, with gusts as high as 47 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.

Sunday Night

A 40 percent chance of showers, mainly before 8pm. Partly cloudy, with a low around 42. West southwest wind 6 to 15 mph, with gusts as high as 28 mph. New precipitation amounts of less than a tenth of an inch possible.

Monday

Mostly sunny, with a high near 54. West northwest wind 6 to 8 mph.

Monday Night

Mostly clear, with a low around 46. Southwest wind 10 to 13 mph, with gusts as high as 22 mph.

Tuesday

Sunny, with a high near 56.

Tuesday Night

Mostly clear, with a low around 45.

Wednesday

Mostly sunny, with a high near 55.

Wednesday Night

Partly cloudy, with a low around 49.