National Weather Service Forecast for: 3 Miles N Upland CA
Issued by: National Weather Service San Diego, CA
Updated: 12:34 am PDT Aug 20, 2026
 
Overnight

Overnight: Clear, with a low around 75. Calm wind.
Clear
Thursday

Thursday: Mostly sunny, with a high near 93. Light and variable wind becoming west 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Mostly Sunny
Thursday
Night
Thursday Night: Mostly clear, with a low around 73. West wind 5 to 10 mph becoming light and variable  in the evening.
Mostly Clear
Friday

Friday: Sunny, with a high near 92. Light and variable wind becoming southwest 5 to 10 mph in the morning.
Sunny
Friday
Night
Friday Night: Mostly clear, with a low around 71. West wind around 5 mph becoming calm  in the evening.
Mostly Clear
Saturday

Saturday: Sunny, with a high near 91.
Sunny
Saturday
Night
Saturday Night: Mostly clear, with a low around 72.
Mostly Clear
Sunday

Sunday: Sunny, with a high near 90.
Sunny
Sunday
Night
Sunday Night: Mostly clear, with a low around 71.
Mostly Clear
Lo 75 °F Hi 93 °F Lo 73 °F Hi 92 °F Lo 71 °F Hi 91 °F Lo 72 °F Hi 90 °F Lo 71 °F

Heat Advisory
 

Overnight
 
Clear, with a low around 75. Calm wind.
Thursday
 
Mostly sunny, with a high near 93. Light and variable wind becoming west 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Thursday Night
 
Mostly clear, with a low around 73. West wind 5 to 10 mph becoming light and variable in the evening.
Friday
 
Sunny, with a high near 92. Light and variable wind becoming southwest 5 to 10 mph in the morning.
Friday Night
 
Mostly clear, with a low around 71. West wind around 5 mph becoming calm in the evening.
Saturday
 
Sunny, with a high near 91.
Saturday Night
 
Mostly clear, with a low around 72.
Sunday
 
Sunny, with a high near 90.
Sunday Night
 
Mostly clear, with a low around 71.
Monday
 
Sunny, with a high near 91.
Monday Night
 
Mostly clear, with a low around 72.
Tuesday
 
Sunny, with a high near 92.
Tuesday Night
 
Mostly clear, with a low around 73.
Wednesday
 
Sunny, with a high near 92.

 

Forecast from NOAA-NWS for 3 Miles N Upland CA.