National Weather Service Forecast for: Alta Sierra CA
Issued by: National Weather Service Sacramento, CA
Updated: 11:31 pm PDT Aug 19, 2026
 
Overnight

Overnight: Mostly clear, with a low around 64. Calm wind.
Mostly Clear
 Thursday

Thursday: Mostly sunny, with a high near 91. Light and variable wind becoming southwest around 6 mph in the afternoon.
Mostly Sunny
 Thursday
Night
Thursday Night: Partly cloudy, with a low around 63. Calm wind.
Partly Cloudy
 Friday

Friday: Partly sunny, with a high near 89. Calm wind becoming south southwest around 6 mph in the afternoon.
Partly Sunny
 Friday
Night
Friday Night: Mostly clear, with a low around 61. South southwest wind around 5 mph becoming calm in the evening.
Mostly Clear
 Saturday

Saturday: Sunny, with a high near 87.
Sunny
 Saturday
Night
Saturday Night: Mostly clear, with a low around 60.
Mostly Clear
 Sunday

Sunday: Sunny, with a high near 88.
Sunny
 Sunday
Night
Sunday Night: Partly cloudy, with a low around 62.
Partly Cloudy
Lo 64 °F Hi 91 °F Lo 63 °F Hi 89 °F Lo 61 °F Hi 87 °F Lo 60 °F Hi 88 °F Lo 62 °F

 

Overnight
 
 Mostly clear, with a low around 64. Calm wind.
Thursday
 
 Mostly sunny, with a high near 91. Light and variable wind becoming southwest around 6 mph in the afternoon.
Thursday Night
 
 Partly cloudy, with a low around 63. Calm wind.
Friday
 
 Partly sunny, with a high near 89. Calm wind becoming south southwest around 6 mph in the afternoon.
Friday Night
 
 Mostly clear, with a low around 61. South southwest wind around 5 mph becoming calm in the evening.
Saturday
 
 Sunny, with a high near 87.
Saturday Night
 
 Mostly clear, with a low around 60.
Sunday
 
 Sunny, with a high near 88.
Sunday Night
 
 Partly cloudy, with a low around 62.
Monday
 
 Mostly sunny, with a high near 87.
Monday Night
 
 Mostly clear, with a low around 61.
Tuesday
 
 Sunny, with a high near 87.
Tuesday Night
 
 Partly cloudy, with a low around 61.
Wednesday
 
 Sunny, with a high near 87.

 

Forecast from NOAA-NWS for Alta Sierra CA.