The National Weather Service office in San Diego warned of fire weather conditions for the next few days in county mountains and deserts.
The agency said it will remain very dry for inland areas with the lowest daytime humidity around 5% for the deserts onto the desert slopes of the mountains.
Highs on Wednesday will be 70 to 75 near the coast, 76 to 79 inland, 78 to 83 in the western valleys, 85 to 90 near the foothills, 83 to 93 in the mountains and 107 to 112 in the deserts, according to the weather service.
An excessive heat warning is prompting Three Sisters Falls and Cedar Creek Falls in East County’s Cleveland National Forest to close for the duration of the weather event, the U.S. Forest Service says. The San Diego County Sheriff’s Department has been letting hikers know about trail closures in the area for the past several days.
There will be a slight recovery for the weekend with the lowest daytime humidity around 10%. The very low humidity combined with gusty sea breeze winds during the afternoon and evening will result in near critical fire weather conditions.
The strongest gusts along and near desert slopes of the mountains will be around 50 mph during the afternoon and evening through Thursday. Then not quite as strong on Friday and Saturday with gusts around 40 mph.
Onshore flow and the marine layer will moderate the heat for the coast into the valleys and maintain higher humidity, forecasters said.
After inland areas cool slowly through Saturday, warming will return Sunday through early next week as high pressure to the east strengthens and expands westward.
Updated at 5:42 p.m. July 4, 2023
City News Service contributed to this article.
