July 26, 2026 11:26 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.

There are more ways to follow the Pain In The Pass. Join the Traffic Group on Facebook with over 163,000 members. Join the group on MeWe. Like us on the NEW page on Facebook. Follow us on Instagram, and also follow us on Threads, and X aka Twitter.

loader-image
Cajon Pass
11:26 am, Jul 26, 2026
temperature icon 88°F
broken clouds
Humidity: 22 %
Pressure: 1013 mb
Wind: 3 mph
Wind Gust: 5 mph
Clouds: 51%
Visibility: 10 km
Sunrise: 5:55 am
Sunset: 7:56 pm
  • Temperature
  • Precipitation
  • Rain Chance
  • Wind
  • Humidity
  • Pressure
2:00 pm
temperature icon
87°/88°°F 0 mm 0% 11 mph 21% 1013 mb 0 mm/h
5:00 pm
temperature icon
86°/87°°F 0 mm 0% 7 mph 16% 1012 mb 0 mm/h
8:00 pm
temperature icon
74°/74°°F 0 mm 0% 8 mph 27% 1013 mb 0 mm/h
11:00 pm
temperature icon
70°/70°°F 0 mm 0% 4 mph 31% 1014 mb 0 mm/h
2:00 am
temperature icon
67°/67°°F 0 mm 0% 3 mph 29% 1013 mb 0 mm/h
5:00 am
temperature icon
65°/65°°F 0 mm 0% 2 mph 25% 1013 mb 0 mm/h
8:00 am
temperature icon
73°/73°°F 0 mm 0% 3 mph 17% 1014 mb 0 mm/h
11:00 am
temperature icon
84°/84°°F 0 mm 0% 6 mph 13% 1012 mb 0 mm/h