August 21, 2026 7:45 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.

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Cajon Pass
7:45 pm, Aug 21, 2026
temperature icon 85°F
scattered clouds
Humidity: 11 %
Pressure: 1014 mb
Wind: 15 mph
Wind Gust: 12 mph
Clouds: 31%
Visibility: 10 km
Sunrise: 6:15 am
Sunset: 7:30 pm
  • Temperature
  • Precipitation
  • Rain Chance
  • Wind
  • Humidity
  • Pressure
8:00 pm
temperature icon
76°/85°°F 0 mm 0% 10 mph 11% 1014 mb 0 mm/h
11:00 pm
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72°/80°°F 0 mm 0% 5 mph 21% 1015 mb 0 mm/h
2:00 am
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70°/75°°F 0 mm 0% 4 mph 31% 1015 mb 0 mm/h
5:00 am
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69°/69°°F 0 mm 0% 1 mph 38% 1015 mb 0 mm/h
8:00 am
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75°/75°°F 0 mm 0% 2 mph 23% 1016 mb 0 mm/h
11:00 am
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86°/86°°F 0 mm 0% 7 mph 17% 1015 mb 0 mm/h
2:00 pm
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91°/91°°F 0 mm 0% 17 mph 15% 1013 mb 0 mm/h
5:00 pm
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87°/87°°F 0 mm 0% 19 mph 17% 1012 mb 0 mm/h