Temperatures in downtown San Francisco set a record high Friday, reaching 85 degrees, according to the National Weather Service.
The previous high for today was 82 degrees set in 1973.
Friday was forecasted to be the hottest day this week as temperatures rose throughout the Bay Area.
Temperatures in the area are expected to begin cooling this weekend.
The Bay Area Air Quality Management District issued a Spare the Air alert for Friday.
The alert, the sixth issued during the summer season and the first since June 9, was prompted by high levels of ozone pollution expected in the Bay Area on Friday, air district officials said.
The air district encourages Bay Area residents to drive less, particularly on Spare the Air days, since heat, low wind and vehicle exhaust can combine to cause breathing problems, particularly for the young, seniors and those with respiratory or heart conditions
Keep up with the weather with the Bay Area weather team.