August 19, 2026 1:04 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
1:04 am, Aug 19, 2026
temperature icon 73°F
broken clouds
Humidity: 21 %
Pressure: 1014 mb
Wind: 9 mph
Wind Gust: 9 mph
Clouds: 81%
Visibility: 10 km
Sunrise: 6:13 am
Sunset: 7:32 pm
  • Temperature
  • Precipitation
  • Rain Chance
  • Wind
  • Humidity
  • Pressure
2:00 am
temperature icon
65°/73°°F 0 mm 0% 2 mph 21% 1014 mb 0 mm/h
5:00 am
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64°/70°°F 0 mm 0% 2 mph 27% 1014 mb 0 mm/h
8:00 am
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74°/74°°F 0 mm 0% 2 mph 22% 1014 mb 0 mm/h
11:00 am
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87°/87°°F 0 mm 0% 5 mph 14% 1013 mb 0 mm/h
2:00 pm
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94°/94°°F 0 mm 0% 14 mph 11% 1011 mb 0 mm/h
5:00 pm
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90°/90°°F 0 mm 0% 15 mph 13% 1010 mb 0 mm/h
8:00 pm
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78°/78°°F 0 mm 0% 9 mph 28% 1012 mb 0 mm/h
11:00 pm
temperature icon
71°/71°°F 0 mm 0% 4 mph 37% 1014 mb 0 mm/h