August 17, 2026 11:33 PM

Pop-Up Thunderstorms are in the Forecast this Weekend

SOUTHERN CALIFORNIA, CA. (Pain In The Pass) >> The Southern California Weather Force Forecast calls for partly cloudy skies for Saturday with a 30% chance of scattered morning, afternoon, evening showers, and thunderstorms. The high will be mid 100s to 110+ degrees. Mountains temps will be in the mid 80s to 90+ degrees.

Sunday Forecast will be the same as Saturday.

A promising cooler weather pattern change begins on Tuesday with temperatures will feel more normal below 100 degrees across Southern California.

A ridge of high pressure has continued to affect SoCal. Today and Sunday thunderstorms can produce little to a lot of precipitation at times, especially considering the faster movement of storm activity. Each thunderstorm cell will also be capable of producing gusty, erratic outflow winds, gusting upwards of 45 to 60+ mph in region, that can make a dust storm.

The peak time of a afternoon pop-up thunderstorm can start before 1pm to 4pm and can last until 7pm with the heat in the air.

The heaviest downpours can have the potential to bring a quick 1-2 inches of rain. The risk for localized flash flooding is low to modrate, but cannot be ruled out because the ground is dry and in the burn scars areas.

“When Thunder Roars, Go Indoors”

If you travel through the Cajon Pass or on Interstate 15 expect traffic due to the weather condition can change quickly. Remember to SLOW DOWN in the rain and or blowing dust.

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Cajon Pass
11:33 pm, Aug 17, 2026
temperature icon 74°F
overcast clouds
Humidity: 23 %
Pressure: 1015 mb
Wind: 12 mph
Wind Gust: 12 mph
Clouds: 95%
Visibility: 10 km
Sunrise: 6:12 am
Sunset: 7:35 pm
  • Temperature
  • Precipitation
  • Rain Chance
  • Wind
  • Humidity
  • Pressure
2:00 am
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66°/71°°F 0 mm 0% 2 mph 27% 1015 mb 0 mm/h
5:00 am
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66°/69°°F 0 mm 0% 1 mph 29% 1015 mb 0 mm/h
8:00 am
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73°/73°°F 0 mm 0% 2 mph 22% 1015 mb 0 mm/h
11:00 am
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83°/83°°F 0 mm 0% 3 mph 17% 1014 mb 0 mm/h
2:00 pm
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89°/89°°F 0 mm 0% 12 mph 16% 1013 mb 0 mm/h
5:00 pm
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87°/87°°F 0 mm 0% 8 mph 16% 1012 mb 0 mm/h
8:00 pm
temperature icon
76°/76°°F 0 mm 0% 3 mph 28% 1013 mb 0 mm/h
11:00 pm
temperature icon
71°/71°°F 0 mm 0% 3 mph 33% 1015 mb 0 mm/h