With summer right around the corner, temperatures will heat up across Southern California this week, with highs hovering in the 90s in many areas.

Sunday’s high in downtown Los Angeles was 80 degrees, with that number expected to rise to 89 on Monday before settling into the mid-80s the rest of the week, according to the National Weather Service.

In Woodland Hills, Sunday’s high was 88, but will spike to 97 Monday, 92 Tuesday, 94 Wednesday and 96 Thursday, the NWS said.

Pasadena had a high of 84 on Sunday, with a forecast of 93 Monday, 89 Tuesday, 90 Wednesday and 91 Thursday.

The Antelope Valley will see highs in the upper 90s this week, with Lancaster reaching 97 Tuesday, 96 Wednesday and 99 on Thursday, forecasters said.

In inland Orange County, highs were in the upper 70s Sunday, but were expected to linger in the 80s for the rest of the week.

Tuesday is the first day of summer.

Brief critical fire weather conditions were expected Sunday night in the valleys and mountains due to low humidity and wind gusts peaking in the 35-50 mph range. Low humidity from 8% to 18% will persist across the mountains and deserts throughout the week. However, forecasters noted the possibility of tropical moisture reaching Los Angeles County by Wednesday, which could result in cumulus buildups in the mountains and a temporary increase in daytime humidity.

As usual during heat waves, forecasters urged people to drink plenty of fluids, seek out air conditioned spaces and check in on vulnerable relatives and neighbors.

“Extreme heat will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities,” according to the NWS.

“Young children and pets should never be left unattended in vehicles under any circumstances. This is especially true during warm or hot weather when car interiors can reach lethal temperatures in a matter of minutes.”

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