June 7, 2026 4:35 PM

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
4:35 pm, Jun 7, 2026
temperature icon 77°F
clear sky
Humidity: 24 %
Pressure: 1007 mb
Wind: 18 mph
Wind Gust: 17 mph
Clouds: 0%
Visibility: 10 km
Sunrise: 5:37 am
Sunset: 7:59 pm
  • Temperature
  • Precipitation
  • Rain Chance
  • Wind
  • Humidity
  • Pressure
5:00 pm
temperature icon
69°/77°°F 0 mm 0% 14 mph 23% 1006 mb 0 mm/h
8:00 pm
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62°/72°°F 0 mm 0% 10 mph 31% 1007 mb 0 mm/h
11:00 pm
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58°/64°°F 0 mm 0% 7 mph 49% 1009 mb 0 mm/h
2:00 am
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57°/57°°F 0 mm 0% 6 mph 64% 1009 mb 0 mm/h
5:00 am
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55°/55°°F 0 mm 0% 5 mph 60% 1009 mb 0 mm/h
8:00 am
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63°/63°°F 0 mm 0% 3 mph 36% 1010 mb 0 mm/h
11:00 am
temperature icon
72°/72°°F 0 mm 0% 10 mph 21% 1008 mb 0 mm/h
2:00 pm
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74°/74°°F 0 mm 0% 13 mph 17% 1008 mb 0 mm/h