April 5, 2026 9:50 AM

Hot and Sticky Weather for the First Week of September

SOUTHERN CALIFORNIA, CA. (Pain In The Pass) >> This week’s weather forecast for Monday September 1 through Friday September 5 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, and a high of 102°. Tuesday will be hot, mostly sunny with a chance of rain showers and thunderstorms, with a high of 101°. Wednesday will be hot, mostly sunny, and a high of 100°. Thursday will be hot, sunny, and a high of 98°. Friday will be hot, mostly sunny and a high of 96°.

High Deserts Area Average Weather/Temps:

Monday will be hot, sunny, windy, and a high of 102+°. Tuesday will be hot, mostly sunny with a chance of rain showers and thunderstorms, windy, and a high of 101+°. Wednesday will be hot, mostly sunny with a chance of thunderstorms, windy and a high of 100+°. Thursday will be hot, mostly sunny with a chance of thunderstorms, windy, and a high of 98+°. Friday will be hot, mostly sunny with a chance of thunderstorms, windy, and a high 96+°. 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, mostly sunny with a chance of rain showers and thunderstorms, windy, and a high of 78°. Wednesday will be warm, mostly sunny with chance of and thunderstorms, windy and a high of 76°. Thursday will be warm, mostly sunny with a chance of thunderstorms, windy, and a high of 74°. Friday will be warm, mostly sunny with a chance of thunderstorms, windy, and a high of 73°.

*Timing of the Weather on each day can change.

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Cajon Pass
9:50 am, Apr 5, 2026
temperature icon 68°F
broken clouds
Humidity: 13 %
Pressure: 1017 mb
Wind: 6 mph
Wind Gust: 8 mph
Clouds: 56%
Visibility: 10 km
Sunrise: 6:30 am
Sunset: 7:13 pm
  • Temperature
  • Precipitation
  • Rain Chance
  • Wind
  • Humidity
  • Pressure
11:00 am
temperature icon
66°/67°°F 0 mm 0% 5 mph 13% 1017 mb 0 mm/h
2:00 pm
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68°/70°°F 0 mm 0% 5 mph 13% 1016 mb 0 mm/h
5:00 pm
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70°/71°°F 0 mm 0% 8 mph 10% 1015 mb 0 mm/h
8:00 pm
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59°/59°°F 0 mm 0% 6 mph 16% 1015 mb 0 mm/h
11:00 pm
temperature icon
57°/57°°F 0 mm 0% 5 mph 21% 1016 mb 0 mm/h
2:00 am
temperature icon
59°/59°°F 0 mm 0% 5 mph 26% 1016 mb 0 mm/h
5:00 am
temperature icon
57°/57°°F 0 mm 0% 5 mph 28% 1015 mb 0 mm/h
8:00 am
temperature icon
60°/60°°F 0 mm 0% 3 mph 26% 1016 mb 0 mm/h