October 28, 2026 5:46 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
5:46 pm, Oct 28, 2026
temperature icon 63°F
clear sky
Humidity: 31 %
Pressure: 1013 mb
Wind: 7 mph
Wind Gust: 13 mph
Clouds: 0%
Visibility: 10 km
Sunrise: 7:05 am
Sunset: 6:00 pm
  • Temperature
  • Precipitation
  • Rain Chance
  • Wind
  • Humidity
  • Pressure
8:00 pm
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56°/60°°F 0 mm 0% 6 mph 39% 1013 mb 0 mm/h
11:00 pm
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51°/55°°F 0 mm 0% 4 mph 49% 1014 mb 0 mm/h
2:00 am
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49°/49°°F 0 mm 0% 1 mph 60% 1014 mb 0 mm/h
5:00 am
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48°/48°°F 0 mm 0% 1 mph 56% 1013 mb 0 mm/h
8:00 am
temperature icon
51°/51°°F 0 mm 0% 1 mph 53% 1013 mb 0 mm/h
11:00 am
temperature icon
62°/62°°F 0 mm 0% 5 mph 37% 1013 mb 0 mm/h
2:00 pm
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66°/66°°F 0 mm 0% 11 mph 35% 1010 mb 0 mm/h
5:00 pm
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61°/61°°F 0 mm 0% 12 mph 55% 1010 mb 0 mm/h