August 9, 2026 9:31 PM

Monsoon Weather for Monday and Tuesday for Southern California

SOUTHERN CALIFORNIA, CA. ( Pain In The Pass) >> A subtropical cutoff low of monsoon moisture will be in SoCal area. Monday and Tuesday will bring a chance of rain showers and thunderstorms with possibly of dry lightning in the forecast.

It looks like the best chances will be mainly on Monday into Tuesday, but the mountains and deserts communities will see most of the action each day. Can’t rule out a pop-up storm or two for the Inland Empire Valleys cities.

Each pop-up thunderstorm cell could be capable of producing heavy rain showers, gusty, erratic outflow winds, gusting upwards of 40 to 60+ mph in region.

The heaviest downpours can have the potential to bring a quick 1+ inches of rain. The risk for localized flash flooding is low to medium, 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 and on I-40. Expect traffic due to the weather condition can change quickly. Remember to SLOW DOWN in the rain and or blowing dust.

Each storm cell is a chance of a new start of a brush fire could be possible due to lighting strikes across the mountains and desert area. Fire Weather Alert considerations for Monday – Wednesday, a lightning strike could ignite a new wildfire.

 With weather updates from the Southern California Weather Force and the Zone Watch app. They will post updates on the weather, so join both.

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If you do get into an accident, click or call the trusted professionals of Lerner, Moore, Silva, Cunningham & Rubel Professional Law Corporation.

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Cajon Pass
9:31 pm, Aug 9, 2026
temperature icon 79°F
few clouds
Humidity: 19 %
Pressure: 1012 mb
Wind: 10 mph
Wind Gust: 16 mph
Clouds: 11%
Visibility: 10 km
Sunrise: 6:06 am
Sunset: 7:43 pm
  • Temperature
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11:00 pm
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68°/75°°F 0 mm 0% 7 mph 28% 1012 mb 0 mm/h
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67°/71°°F 0 mm 0% 6 mph 37% 1012 mb 0 mm/h
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65°/65°°F 0 mm 0% 2 mph 41% 1012 mb 0 mm/h
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72°/72°°F 0 mm 0% 5 mph 29% 1014 mb 0 mm/h
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84°/84°°F 0 mm 0% 13 mph 21% 1013 mb 0 mm/h
2:00 pm
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89°/89°°F 0 mm 0% 17 mph 19% 1011 mb 0 mm/h
5:00 pm
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85°/85°°F 0 mm 0% 15 mph 21% 1011 mb 0 mm/h
8:00 pm
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74°/74°°F 0 mm 0% 11 mph 41% 1013 mb 0 mm/h