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.

45°F

7°C

Humidity	99%
Wind Speed	SSW 9 MPH
Barometer	NA
Dewpoint	45°F (7°C)
Visibility	NA
Wind Chill	40°F (4°C)
Last update	10 Apr 10:05 PM PDT

More Information:

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

Extended Forecast for

2 Miles S Clayton CA

Tonight
Low: 53 °F
Chance Rain
Saturday
High: 63 °F
Showers
Saturday Night
Low: 49 °F
Showers
Sunday
High: 58 °F
Showers
Sunday Night
Low: 48 °F
Chance Rain
then Partly
Cloudy
Monday
High: 63 °F
Mostly Sunny
Monday Night
Low: 48 °F
Mostly Clear
Tuesday
High: 67 °F
Sunny
Tuesday Night
Low: 47 °F
Mostly Clear

Detailed Forecast

Tonight

A 50 percent chance of rain, mainly before 3am. Mostly cloudy, with a low around 53. South southwest wind around 9 mph, with gusts as high as 20 mph. 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. High near 63. South wind 10 to 20 mph, with gusts as high as 33 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Saturday Night

Showers and possibly a thunderstorm before 5am, then rain after 5am. Low around 49. South southwest wind 13 to 20 mph, with gusts as high as 34 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

Sunday

Rain before 8am, then showers and possibly a thunderstorm after 8am. High near 58. Southwest wind 14 to 16 mph, with gusts as high as 31 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Sunday Night

A 40 percent chance of rain before 11pm. Partly cloudy, with a low around 48. West southwest wind 6 to 14 mph, with gusts as high as 25 mph. New precipitation amounts of less than a tenth of an inch possible.

Monday

Mostly sunny, with a high near 63.

Monday Night

Mostly clear, with a low around 48.

Tuesday

Sunny, with a high near 67.

Tuesday Night

Mostly clear, with a low around 47.

Wednesday

Sunny, with a high near 68.

Wednesday Night

Partly cloudy, with a low around 49.