August 19, 2026 1:05 AM

The Heat is Back in this Weeks 5 Day Forecast

SOUTHERN CALIFORNIA, CA. (Pain In The Pass) >> This week’s weather forecast for Monday August 18 through Friday August 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 hot, sunny, and a high of 93°. Tuesday will be hot, sunny, with a high of 93°. Wednesday will be hot, sunny, and a high of 97°. Thursday will be HOT, mostly sunny with a small chance of thunderstorms, and a high of 101°. Friday will be HOT, mostly sunny with a small chance of thunderstorms, and a high of 101°.

High Deserts Area Average Weather/Temps:

Monday will be hot, sunny, windy, and a high of 96+°. Tuesday will be hot, sunny, windy, and a high of 98+°. Wednesday will be hot, mostly sunny with a small chance of thunderstorms, windy and a high of 104+°. Thursday will be hot, mostly sunny with a chance of thunderstorms, windy, and a high of 107+°. Friday will be hot, mostly sunny with a chance of thunderstorms, windy, and a high 107+°. 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, sunny, windy, and a high of 81°. Wednesday will be warm, mostly sunny with a small chance of thunderstorms, windy and a high of 84°. Thursday will be warm, mostly sunny with a chance of thunderstorms, windy, and a high of 86°. Friday will be warm, mostly sunny with a chance of thunderstorms, windy, and a high of 86°.

*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 162,000 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
1:05 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
temperature icon
64°/70°°F 0 mm 0% 2 mph 27% 1014 mb 0 mm/h
8:00 am
temperature icon
74°/74°°F 0 mm 0% 2 mph 22% 1014 mb 0 mm/h
11:00 am
temperature icon
87°/87°°F 0 mm 0% 5 mph 14% 1013 mb 0 mm/h
2:00 pm
temperature icon
94°/94°°F 0 mm 0% 14 mph 11% 1011 mb 0 mm/h
5:00 pm
temperature icon
90°/90°°F 0 mm 0% 15 mph 13% 1010 mb 0 mm/h
8:00 pm
temperature icon
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