September 12, 2026 12:46 PM

Cool Down in the 5 Day Forecast

SOUTHERN CALIFORNIA, CA. (Pain In The Pass) >> This week weather forecast for Monday August 10 through Friday August 14 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, partly sunny with a chance of pop-up thunderstorms, and a high 97°. Tuesday will be hot, mostly sunny, with a high of 93°. Wednesday will be hot, mostly sunny, and a high of 92°. Thursday will be hot, mostly sunny, and a high of 90°. Friday will be hot, mostly sunny, and a high of 90°. 

High Deserts Area Average Weather/Temps:

Monday will be hot, partly sunny with a chance of pop-up thunderstorms, windy, and a high of 103+°. Tuesday will be hot, partly sunny with a chance of pop-up thunderstorms, windy, and a high of 99+°. Wednesday will be hot, partly sunny with a chance of pop-up thunderstorms, windy and a high of 96+°. 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.   

AtmosphericScience

Mountains Area Average Weather/Temps:

Monday will be hot, partly sunny with a chance of pop-up thunderstorms, windy, and a high of 85°. Tuesday will be hot, partly sunny with a chance of pop-up thunderstorms, windy, and a high of 80°. Wednesday will be hot, partly sunny with a chance of pop-up thunderstorms, windy, and a high of 80°. Thursday will be hot, mostly sunny, windy and a high of 76°. Friday will be hot, mostly sunny, windy, and a high of 76°.

*Timing of the Weather on each day can change.

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Cajon Pass
12:46 pm, Sep 12, 2026
temperature icon 87°F
clear sky
Humidity: 24 %
Pressure: 1012 mb
Wind: 11 mph
Wind Gust: 12 mph
Clouds: 7%
Visibility: 10 km
Sunrise: 6:30 am
Sunset: 7:01 pm
  • Temperature
  • Precipitation
  • Rain Chance
  • Wind
  • Humidity
  • Pressure
2:00 pm
temperature icon
82°/87°°F 0 mm 0% 12 mph 24% 1011 mb 0 mm/h
5:00 pm
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80°/85°°F 0 mm 0% 14 mph 26% 1011 mb 0 mm/h
8:00 pm
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70°/76°°F 0 mm 0% 11 mph 40% 1012 mb 0 mm/h
11:00 pm
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65°/65°°F 0 mm 0% 6 mph 56% 1013 mb 0 mm/h
2:00 am
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63°/63°°F 0 mm 0% 5 mph 57% 1013 mb 0 mm/h
5:00 am
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60°/60°°F 0 mm 0% 3 mph 56% 1012 mb 0 mm/h
8:00 am
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66°/66°°F 0 mm 0% 3 mph 48% 1013 mb 0 mm/h
11:00 am
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77°/77°°F 0 mm 0% 7 mph 20% 1012 mb 0 mm/h