The extreme heat is gone, but the monsoon moisture has arrived.
There’s a 30 to 40 percent chance of thunderstorms hitting Southern Nevada today, said Ashley Nickerson, a meteorologist with the National Weather Service office in Las Vegas.
The strongest chances of showers will happen in the afternoon, with “heavy rain a concern,” she said. There could be sudden, gusty winds too.
Harry Reid International Airport has not seen measurable precipitation since June 23, when it recorded 0.02 inches of rain, breaking a rainless streak of 124 days. It was the only rainfall that month.
Last month, Reid recorded a trace of rain July 19. The average August rainfall in Las Vegas is 0.32 inches. In August 2025, Reid only saw a trace.
On Tuesday, storms hit parts of San Bernardino County in eastern California, triggering flash flood and severe thunderstorm warnings in the Mountain Pass/Interstate 15 area.
Cooldown coming
The forecast high for Las Vegas is 102 degrees today, Nickerson said, but that will be the last time the valley sees temperatures above 100 for several days.
A low-pressure system coming from the California coast will cool the valley off through the weekend as temperatures will stay below the normal of 104. The forecast highs for Thursday through Saturday are in the upper 90s.
The high Tuesday at Reid was 101. It was the first day the valley was not under an extreme heat warning since July 29. The warning started July 30 and was extended several times, finally expiring Monday night.
The last time the airport recorded a high below 100 degrees was July 17, when it saw 97, the “coolest” day of the month.
Summer weather facts
— The valley saw its hottest day of the year Aug. 1, with the airport recording 115 degrees, one degree short of a record high (set in 1979 and 1938).
— This past July was the third warmest on record, with an average temperature of 96.6.
— The morning low temperature at Reid on July 29 was 89 degrees. It ended the six-day streak of consecutive days with a low temperature at or above 90 degrees, the longest ever recorded for the valley.
— Las Vegas recorded its first 110-degree day of the year on July 8.
— The airport registered 12 days of 110 degrees or more in July, which was not a record. The annual normal is 10 days. In 2024, Reid saw a record 36 days of high temperatures of least 110.
Contact Mark Davis at mdavis@reviewjournal.com.
