March 9, 2026 12:10 PM

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.

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Cajon Pass
12:10 pm, Mar 9, 2026
temperature icon 64°F
clear sky
Humidity: 26 %
Pressure: 1012 mb
Wind: 15 mph
Wind Gust: 7 mph
Clouds: 0%
Visibility: 10 km
Sunrise: 7:08 am
Sunset: 6:52 pm
  • Temperature
  • Precipitation
  • Rain Chance
  • Wind
  • Humidity
  • Pressure
2:00 pm
temperature icon
60°/63°°F 0 mm 0% 6 mph 26% 1011 mb 0 mm/h
5:00 pm
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59°/61°°F 0 mm 0% 8 mph 34% 1010 mb 0 mm/h
8:00 pm
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48°/48°°F 0 mm 0% 5 mph 69% 1012 mb 0 mm/h
11:00 pm
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39°/39°°F 0 mm 0% 4 mph 79% 1014 mb 0 mm/h
2:00 am
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36°/36°°F 0 mm 0% 3 mph 80% 1014 mb 0 mm/h
5:00 am
temperature icon
43°/43°°F 0 mm 0% 5 mph 79% 1014 mb 0 mm/h
8:00 am
temperature icon
47°/47°°F 0 mm 0% 5 mph 81% 1016 mb 0 mm/h
11:00 am
temperature icon
59°/59°°F 0 mm 0% 5 mph 51% 1017 mb 0 mm/h