February 21, 2026 10:42 AM

Pop-Up Thunderstorms are in the Forecast this Weekend

HIGH DESERT, CA. (Pain In The Pass) >> The Southern California Weather Force Forecast calls for mostly cloudy skies for Saturday with a 30% chance of scattered afternoon and 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 or below normal temps 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 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
10:42 am, Feb 21, 2026
temperature icon 45°F
clear sky
Humidity: 39 %
Pressure: 1022 mb
Wind: 7 mph
Wind Gust: 4 mph
Clouds: 3%
Visibility: 10 km
Sunrise: 6:28 am
Sunset: 5:38 pm
  • Temperature
  • Precipitation
  • Rain Chance
  • Wind
  • Humidity
  • Pressure
1:00 pm
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48°/53°°F 0 mm 0% 5 mph 40% 1022 mb 0 mm/h
4:00 pm
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47°/48°°F 0 mm 0% 7 mph 34% 1021 mb 0 mm/h
7:00 pm
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43°/43°°F 0 mm 0% 3 mph 44% 1024 mb 0 mm/h
10:00 pm
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39°/39°°F 0 mm 0% 4 mph 44% 1025 mb 0 mm/h
1:00 am
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39°/39°°F 0 mm 0% 5 mph 44% 1026 mb 0 mm/h
4:00 am
temperature icon
39°/39°°F 0 mm 0% 6 mph 46% 1026 mb 0 mm/h
7:00 am
temperature icon
41°/41°°F 0 mm 0% 6 mph 45% 1026 mb 0 mm/h
10:00 am
temperature icon
51°/51°°F 0 mm 0% 5 mph 29% 1026 mb 0 mm/h