Temperatures this week are expected in some areas to be the hottest of the season, so far, as a warm-up sweeps across Southern California, particularly in the deserts.
While areas to the north will be more significantly affected, San Diego County will be under an excessive heat warning for the deserts from 10 a.m. Wednesday through 9 p.m. Friday.
"Things are going to change as we look ahead to the rest of your week," NBC 7 Meteorologist Brooke Martell said. "We actually do have an excessive heat warning going into effect for the desert region Wednesday morning. It'll last to Friday night because daytime highs across the desert up to 113 degrees."
A ridge of high pressure is to blame for the temperature rise, which moved in earlier this week but is expected to peak Wednesday and Thursday for the coast and inland valleys, and Thursday and Friday for the mountains and deserts, NBC 7 Meteorologist Greg Bledsoe said.
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The mountains will see temperatures 8 to 12 degrees above average for this time of year.
Along the coast, a marine layer will still keep things relatively cool overnight and keep daytime temperatures only a few degrees above average for this time of year. The cloud cover will start to clear by the afternoon.
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"While inland areas will have their hottest weather so far this year, it is mostly not expected to be recording setting," the NWS said.
Daytime highs for Thursday were expected to be:
- COAST: Upper 60s to low 70s
- VALLEYS: Mid-70s to mid-80s
- MOUNTAINS: Mid to upper 80s
- DESERT: Excessive Heat Warning, Near 110
Temperatures Thursday and Friday are expected to continue to increase to the low-70s at the coast, in the low 80s for the inland valleys, in the upper 80s for the mountains and in the triple digits in the deserts.
An excessive heat warning is issued when extreme temperatures can cause illness or, in rare cases, death. The county advises people to stay indoors where possible and drink plenty of water. Signs of heatstroke include dizziness, nausea, confusion and headache. Anyone suffering these symptoms should call 911.
In anticipation of the extreme heat, San Diego County is opening 33 cool zones from June 1 to Oct. 31, at libraries, community centers and other locations. Find a list of locations here.
🧊 Tap the link below for a list of places to cool off in San Diego County
The warm-up will start to break apart by the weekend and into next week but temperatures will still be higher than normal in the deserts, the NWS said.
