Forecast highs on Saturday
Forecast highs on Saturday are in the 100s in many areas of the region. Courtesy National Weather Service

An “unusually strong” heat wave that will push temperatures into the triple digits in many parts of San Diego County is forecast to begin Friday and last through Labor Day.

“An upper level high pressure system or dome of hot air from the north will settle over Southern California Friday through Monday. This will result in an unusually strong heat wave Friday through Monday, likely the hottest days of the year for Saturday and Sunday,” according to the National Weather Service office in San Diego.

Temperatures will range from the 80s to low 90s at the beaches, from the low 90s to over 100 in coastal cities, and from the high 90s to over 110 in the inland valleys. Overnight lows will be very warm, even along the coast.

The weather service issued an excessive heat warning for the inland valleys, mountains and deserts from 10 a.m. Friday through 8 p.m. Monday. A second warning for coastal areas will run from 10 a.m. Saturday through 8 p.m. Monday.

Meteorologists warned of a high risk of wildfires and heat-related illnesses during the four-day period.

“Dry air and hot temperatures make for high wildfire risk especially with offshore gusty winds developing on Saturday,” according to the weather service.

The weather service also warned that strong Santa Ana winds are likely to develop on Tuesday and Wednesday next week, creating continued wildfire danger.

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Chris Jennewein

Chris Jennewein is Editor & Publisher of Times of San Diego.