August 18, 2026 4:08 AM

Chance of Thunderstorm Today

HIGH DESERT, CA. (Pain In The Pass) >> High temperatures and monsoonal moisture are threatening this afternoon. There is a 10% to 20% chance of thunderstorms developing for the high desert and mountain area Sunday afternoon and a 30% chance for the Big Bear area.

So, this will make things hot and sticky across Southern California.

An excessive-heat warning remains in effect for much of the region’s inland communities between Las Vegas Neveda and San Bernardino County this weekend. The high desert cities are expected to exceed 105 degrees, with other inland valleys between 90 and 100.

If thunderstorms materialize, take the threat seriously and seek shelter inside. When thunder roars, go indoors! If not indoors in a vehicle.

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Cajon Pass
4:08 am, Aug 18, 2026
temperature icon 69°F
overcast clouds
Humidity: 34 %
Pressure: 1014 mb
Wind: 8 mph
Wind Gust: 9 mph
Clouds: 100%
Visibility: 10 km
Sunrise: 6:12 am
Sunset: 7:34 pm
  • Temperature
  • Precipitation
  • Rain Chance
  • Wind
  • Humidity
  • Pressure
5:00 am
temperature icon
62°/69°°F 0 mm 0% 1 mph 34% 1015 mb 0 mm/h
8:00 am
temperature icon
69°/70°°F 0 mm 0% 2 mph 32% 1015 mb 0 mm/h
11:00 am
temperature icon
78°/83°°F 0 mm 0% 3 mph 22% 1014 mb 0 mm/h
2:00 pm
temperature icon
89°/89°°F 0 mm 0% 12 mph 16% 1013 mb 0 mm/h
5:00 pm
temperature icon
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
2:00 am
temperature icon
68°/68°°F 0 mm 0% 1 mph 35% 1014 mb 0 mm/h