April 21, 2026 6:07 AM

Hot August Nights to Start, then Ends the Month Little Cooler

SOUTHERN CALIFORNIA, CA. (Pain In The Pass) >> This week’s weather forecast for Monday August 25 through Friday August 29 for Southern California. Check out the 5-day forecast below in your area.

Cajon Pass/Inland Empire Valley Area Average Weather/Temps:

Monday will be hot, mostly sunny with a small chance of thunderstorms, and a high of 98°. Tuesday will be hot, mostly sunny with a small chance of thunderstorms, with a high of 94°. Wednesday will be hot, mostly sunny, and a high of 94°. Thursday will be hot, mostly sunny, and a high of 92°. Friday will be hot, and a high of 91°.

High Deserts Area Average Weather/Temps:

Monday will be hot, mostly sunny with a chance of thunderstorms, windy, and a high of 98+°. Tuesday will be hot, mostly sunny with a chance of thunderstorms, windy, and a high of 95+°. Wednesday will be hot, mostly sunny with a small chance of thunderstorms, windy and a high of 95+°. Thursday will be hot, mostly sunny, windy, and a high of 93+°. Friday will be hot, mostly sunny , windy, and a high 92+°. Higher temps in the Barstow area.

Mountains Area Average Weather/Temps:

Monday will be warm, sunny, windy, and a high of 80°. Tuesday will be warm, sunny, windy, and a high of 78°. Wednesday will be warm, mostly sunny with a small chance of thunderstorms, windy and a high of 78°. Thursday will be warm, mostly sunny with a chance of thunderstorms, windy, and a high of 75°. Friday will be warm, mostly sunny with a chance of thunderstorms, windy, and a high of 74°.

*Timing of the Weather on each day can change.

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Cajon Pass
6:07 am, Apr 21, 2026
temperature icon 43°F
clear sky
Humidity: 56 %
Pressure: 1015 mb
Wind: 9 mph
Wind Gust: 10 mph
Clouds: 3%
Visibility: 10 km
Sunrise: 6:10 am
Sunset: 7:25 pm
  • Temperature
  • Precipitation
  • Rain Chance
  • Wind
  • Humidity
  • Pressure
8:00 am
temperature icon
45°/49°°F 0 mm 0% 11 mph 57% 1015 mb 0 mm/h
11:00 am
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54°/60°°F 0 mm 0% 17 mph 40% 1015 mb 0 mm/h
2:00 pm
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61°/61°°F 0 mm 0% 22 mph 41% 1014 mb 0 mm/h
5:00 pm
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55°/55°°F 0 mm 0% 20 mph 60% 1014 mb 0 mm/h
8:00 pm
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49°/49°°F 0.26 mm 26% 15 mph 68% 1015 mb 0 mm/h
11:00 pm
temperature icon
38°/38°°F 0 mm 0% 11 mph 73% 1017 mb 0 mm/h
2:00 am
temperature icon
45°/45°°F 0 mm 0% 11 mph 79% 1017 mb 0 mm/h
5:00 am
temperature icon
43°/43°°F 0 mm 0% 7 mph 82% 1018 mb 0 mm/h