Triple-digit temperatures and high humidity will return to San Diego’s valleys, mountains and deserts at the start of the work week when an Excessive Heat Watch goes into effect Monday.
Temperatures in the deserts will be between 112 to 117 degrees, the valleys will heat up to 97 to 105 and the mountains below 5,000 feet will range between 95 to 103 degrees.
A high-pressure system will expand over San Diego this weekend and into next week resulting in hot temperatures Monday and Tuesday, the National Weather Service (NWS) said. Monsoonal moisture will likely return to the area Wednesday and bring a slight cooling with higher humidity.
"When that monsoonal moisture returns in the mountains on Wednesday, Thursday and Friday, we will have a slight chance of some thunderstorm activity or isolated showers," NBC 7 weathercaster Liberty Zabala said Saturday.
The Excessive Heat Watch is in effect until Tuesday evening.
The county's inland areas had an Excessive Heat Warning just a week ago.