September 20, 2026 8:35 PM

Summer Like Temps at the End of the 5 Day Forecast

SOUTHERN CALIFORNIA, CA. (Pain In The Pass) >> This week weather forecast for Monday September 21 through Friday September 25 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 morning fog, and a high 82°. Tuesday will be hot, mostly sunny with morning fog, and the high of 85°. Wednesday will be hot, sunny, and a high of 94°. Thursday will be hot, mostly sunny, and a high of 97°. Friday will be hot, mostly sunny, and a high of 96°.  

High Deserts Area Average Weather/Temps:

Monday will be hot, mostly sunny with a chance of thunderstorms, windy, and a high of 87+°. Tuesday will be hot, mostly sunny with a chance of thunderstorms, windy, and a high of 90+°. Wednesday will be hot, sunny, windy and a high of 95+°. Thursday will be hot, sunny, windy, and a high of 99+°. Friday will be hot, mostly sunny, windy, and a high 98+°. Higher temps in the Barstow area. 

Mountains Area Average Weather/Temps:

Monday will be cool, mostly sunny with a chance of thunderstorms, windy, and a high of 70°. Tuesday will be cool., sunny with a chance of thunderstorms, windy, and a high of 70°. Wednesday will be warm, sunny, windy, and a high of 73°. Thursday will be warm, sunny, windy and a high of 75°. Friday will be warm, mostly sunny, windy, and a high of 75°.

*Timing of the Weather on each day can change.

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Cajon Pass
8:35 pm, Sep 20, 2026
temperature icon 72°F
clear sky
Humidity: 27 %
Pressure: 1012 mb
Wind: 6 mph
Wind Gust: 11 mph
Clouds: 0%
Visibility: 10 km
Sunrise: 6:36 am
Sunset: 6:49 pm
  • Temperature
  • Precipitation
  • Rain Chance
  • Wind
  • Humidity
  • Pressure
11:00 pm
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60°/68°°F 0 mm 0% 9 mph 36% 1012 mb 0 mm/h
2:00 am
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57°/62°°F 0 mm 0% 11 mph 44% 1012 mb 0 mm/h
5:00 am
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54°/54°°F 0 mm 0% 9 mph 53% 1012 mb 0 mm/h
8:00 am
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59°/59°°F 0 mm 0% 8 mph 44% 1013 mb 0 mm/h
11:00 am
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70°/70°°F 0 mm 0% 12 mph 29% 1013 mb 0 mm/h
2:00 pm
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74°/74°°F 0 mm 0% 14 mph 25% 1011 mb 0 mm/h
5:00 pm
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71°/71°°F 0 mm 0% 10 mph 32% 1010 mb 0 mm/h
8:00 pm
temperature icon
60°/60°°F 0 mm 0% 6 mph 55% 1012 mb 0 mm/h