August 16, 2026 9:54 PM

Hot August Days in the 5 Day Forecast

SOUTHERN CALIFORNIA, CA. (Pain In The Pass) >> This week weather forecast for Monday August 17 through Friday August 21 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 97°. Tuesday will be hot, mostly sunny, with a high of 99°. Wednesday will be hot, mostly sunny, and a high of 101°. Thursday will be hot, mostly sunny, and a high of 101°. Friday will be hot, mostly sunny, and a high of 100°.  

High Deserts Area Average Weather/Temps:

Monday will be hot, partly sunny with a chance of pop-up thunderstorms, windy, and a high of 100+°. Tuesday will be hot, mostly sunny with a , windy, and a high of 102+°. Wednesday will be hot, mostly sunny, windy and a high of 104+°. Thursday will be hot, mostly sunny with a chance of pop-up thunderstorms, windy, and a high of 104+°. Friday will be hot, mostly sunny with a chance of pop-up thunderstorms, windy, and a high 102+°. Higher temps in the Barstow area.   

Mountains Area Average Weather/Temps:

Monday will be hot, partly sunny, windy, and a high of 81°. Tuesday will be hot, partly sunny, windy, and a high of 83°. Wednesday will be hot, partly sunny, windy, and a high of 83°. Thursday will be hot, mostly sunny with a chance of pop-up thunderstorms, windy and a high of 83°. Friday will be hot, mostly sunny with a chance of pop-up thunderstorms, windy, and a high of 81°.

*Timing of the Weather on each day can change.

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Cajon Pass
9:54 pm, Aug 16, 2026
temperature icon 74°F
scattered clouds
Humidity: 18 %
Pressure: 1016 mb
Wind: 4 mph
Wind Gust: 3 mph
Clouds: 32%
Visibility: 10 km
Sunrise: 6:11 am
Sunset: 7:36 pm
  • Temperature
  • Precipitation
  • Rain Chance
  • Wind
  • Humidity
  • Pressure
11:00 pm
temperature icon
68°/74°°F 0 mm 0% 2 mph 21% 1017 mb 0 mm/h
2:00 am
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66°/71°°F 0 mm 0% 2 mph 29% 1017 mb 0 mm/h
5:00 am
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62°/66°°F 0 mm 0% 2 mph 37% 1016 mb 0 mm/h
8:00 am
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71°/71°°F 0 mm 0% 1 mph 30% 1017 mb 0 mm/h
11:00 am
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82°/82°°F 0 mm 0% 4 mph 23% 1015 mb 0 mm/h
2:00 pm
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88°/88°°F 0 mm 0% 19 mph 19% 1013 mb 0 mm/h
5:00 pm
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86°/86°°F 0 mm 0% 15 mph 19% 1012 mb 0 mm/h
8:00 pm
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77°/77°°F 0 mm 0% 9 mph 34% 1014 mb 0 mm/h