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

LOS ALTOS (LOAC1)

Lat: 37.35472°NLon: 122.14167°WElev: 539.0ft.

54°F

12°C

Humidity	100%
Wind Speed	WSW 0 MPH
Barometer	NA
Dewpoint	54°F (12°C)
Visibility	NA
Last update	11 Apr 01:10 AM PDT

More Information:

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

Extended Forecast for

Cupertino CA

Overnight
Low: 50 °F
Slight Chance
Rain
Saturday
High: 62 °F
Chance
Showers then
Showers
Saturday Night
Low: 47 °F
Heavy Rain
then Showers
Likely
Sunday
High: 60 °F
Showers
Sunday Night
Low: 44 °F
Chance Rain
Monday
High: 64 °F
Mostly Sunny
Monday Night
Low: 45 °F
Mostly Clear
Tuesday
High: 66 °F
Sunny
Tuesday Night
Low: 44 °F
Mostly Clear

Detailed Forecast

Overnight

A slight chance of rain before 3am, then a slight chance of rain after 4am. Partly cloudy, with a low around 50. South wind 3 to 5 mph. Chance of precipitation is 20%.

Saturday

A chance of rain and thunderstorms, then showers and possibly a thunderstorm after 4pm. High near 62. South wind 6 to 11 mph increasing to 12 to 17 mph in the afternoon. Winds could gust as high as 31 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 10pm, then a chance of showers and thunderstorms between 10pm and 11pm, then showers likely and possibly a thunderstorm after 11pm. Some of the storms could produce heavy rainfall. Low around 47. South southwest wind 9 to 16 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.

Sunday

Showers and possibly a thunderstorm. High near 60. South southwest wind 9 to 11 mph, with gusts as high as 21 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 rain, mainly before 11pm. Partly cloudy, with a low around 44. West southwest wind 5 to 9 mph becoming calm in the evening.

Monday

Mostly sunny, with a high near 64.

Monday Night

Mostly clear, with a low around 45.

Tuesday

Sunny, with a high near 66.

Tuesday Night

Mostly clear, with a low around 44.

Wednesday

Mostly sunny, with a high near 67.