May 20, 2026 1:07 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.

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Cajon Pass
1:07 am, May 20, 2026
temperature icon 56°F
clear sky
Humidity: 17 %
Pressure: 1015 mb
Wind: 4 mph
Wind Gust: 8 mph
Clouds: 0%
Visibility: 10 km
Sunrise: 5:43 am
Sunset: 7:48 pm
  • Temperature
  • Precipitation
  • Rain Chance
  • Wind
  • Humidity
  • Pressure
2:00 am
temperature icon
51°/56°°F 0 mm 0% 3 mph 17% 1015 mb 0 mm/h
5:00 am
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50°/54°°F 0 mm 0% 7 mph 18% 1015 mb 0 mm/h
8:00 am
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59°/60°°F 0 mm 0% 5 mph 15% 1015 mb 0 mm/h
11:00 am
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70°/70°°F 0 mm 0% 8 mph 10% 1014 mb 0 mm/h
2:00 pm
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76°/76°°F 0 mm 0% 1 mph 8% 1011 mb 0 mm/h
5:00 pm
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70°/70°°F 0 mm 0% 2 mph 9% 1009 mb 0 mm/h
8:00 pm
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65°/65°°F 0 mm 0% 6 mph 21% 1011 mb 0 mm/h
11:00 pm
temperature icon
60°/60°°F 0 mm 0% 6 mph 27% 1012 mb 0 mm/h