September 12, 2026 10:29 PM

More Nice Weather in this Week 5 Day Forecast

SOUTHERN CALIFORNIA, CA. (Pain In The Pass) >> This week’s weather forecast for Monday May 18 through Friday May 22 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 warm, sunny, and a high of 82°. Tuesday will be hot, sunny, with a high of 86°. Wednesday will be hot, sunny, and a high of 88°. Thursday will be warm, sunny, and a high of 87°. Friday will be warm, mostly sunny, and a high of 85°.

High Deserts Area Average Weather/Temps:

Monday will be warm, sunny, windy, and a high of 78+°. Tuesday will be hot, sunny, windy, and a high of 86+°. Wednesday will be hot, sunny, windy and a high of 89+°. Thursday will be hot, sunny, windy, and a high of 91+°. Friday will be hot, mostly sunny, windy, and a high 89+°. Higher temps in the Barstow area.

Mountains Area Average Weather/Temps:

Monday will be cold, sunny, windy, and a high of 58°. Tuesday will be cool, sunny, windy, and a high of 65°. Wednesday will be cool, sunny, windy, and a high of 70°. Thursday will be cool, mostly sunny, windy and a high of 72°. Friday will be cool, mostly sunny, windy, and a high of 72°.

*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 171,000 members. Join the group on MeWe. Like us on the on Facebook. Follow us on Instagram, and also follow us on Threads, and X aka Twitter.

loader-image
Cajon Pass
10:29 pm, Sep 12, 2026
temperature icon 73°F
clear sky
Humidity: 56 %
Pressure: 1013 mb
Wind: 11 mph
Wind Gust: 11 mph
Clouds: 0%
Visibility: 10 km
Sunrise: 6:30 am
Sunset: 7:01 pm
  • Temperature
  • Precipitation
  • Rain Chance
  • Wind
  • Humidity
  • Pressure
11:00 pm
temperature icon
64°/73°°F 0 mm 0% 6 mph 56% 1013 mb 0 mm/h
2:00 am
temperature icon
63°/70°°F 0 mm 0% 4 mph 58% 1013 mb 0 mm/h
5:00 am
temperature icon
60°/64°°F 0 mm 0% 3 mph 58% 1012 mb 0 mm/h
8:00 am
temperature icon
65°/65°°F 0 mm 0% 3 mph 48% 1013 mb 0 mm/h
11:00 am
temperature icon
77°/77°°F 0 mm 0% 6 mph 20% 1012 mb 0 mm/h
2:00 pm
temperature icon
82°/82°°F 0 mm 0% 10 mph 18% 1010 mb 0 mm/h
5:00 pm
temperature icon
78°/78°°F 0 mm 0% 11 mph 26% 1009 mb 0 mm/h
8:00 pm
temperature icon
69°/69°°F 0 mm 0% 8 mph 44% 1010 mb 0 mm/h