A fall heat wave has overtaken San Diego this week, sending temperatures soaring into triple digits in some communities, according to forecasters.
The National Weather Service issued an excessive heat warning for the deserts and inland valley communities, including El Cajon Poway Santee, La Mesa, San Marcos and Escondido from 10 a.m. Tuesday to 8 p.m. Thursday. On Wednesday, that weather alert was extended through Monday. A heat advisory is in effect for the mountains.
Temperatures in some areas could be in the upper 90s to low-100s during that time, particularly near the foothills.
"The heat is on away from the coastline but you can find relief from the heat if you head to the coast," NBC 7 Meteorologist Brooke Martell said.
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Martell said Wednesday's temperatures are expected to be the warmest of the week. Then a coastal eddy will develop to cool temperatures slightly.
Tuesday's temperatures already broke records for that particular fall day. A high of 93 in Palomar Mountain broke the record for the day of 89 set in 2020. It was 94 in Lake Cuyamaca, breaking the record for the day of 89 set in 2020. It was 105 in Campo, breaking the record for the day of 101 set in 2020. It was 112 in Borrego, breaking the record for the day of 111 set in 1991.
Hot temperatures and low humidity could combine to create dangerous fire conditions this week. Although, San Diego isn't expected to be affected by Santa Ana winds, which can often worsen fire weather. Humidity is expected to be 10 to 15% through the weekend with slightly better conditions on Thursday and Friday.
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San Diegans can expect a warm weekend -- albeit slightly cooler than the week. Temperatures will remain 5-10 degrees above average near the coast and 15 to 20 degrees above average for the inland valleys.
Some relief could come as early as next week, although we are not likely to see fall-like weather yet.
