Record-breaking hot weather was expected to overheat the Bay Area on Tuesday, the hottest day of the current heat wave, including coastal areas where people usually seek relief from the heat.

The National Weather Service issued an excessive heat warning for dangerous, life-threatening heat for most of the Bay Area, including the Marin and Sonoma coastal ranges, the interior mountains of the North Bay, the East Bay hills and interior valleys, the coast of the San Francisco Bay and Santa Clara Valley. The warning is valid until Wednesday at 11 p.m.

In San Francisco, where temperatures could reach up to 36 degrees Celsius in some parts of the city, the excessive heat warning is in effect Tuesday from 10 a.m. to 8 p.m. The record high for San Francisco on October 1st was 97 degrees in 1980. The hottest day ever recorded in the city was 106 degrees on September 1, 2017.

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Other areas not in effect are under a heat advisory until 11 p.m. Wednesday, including the North Bay coast, the Peninsula coast, Monterey Bay and the Salinas Valley, as well as much of the Central Valley.

Daily highs on Tuesday will be mostly in the 70s to 90s on the coast, 80s to 100s on the bay and 100s inland. Overnight lows will mostly be in the mid to upper 60s.

The weather service said in its daily forecast discussion that high pressure over the region and a steady offshore current from Tuesday into early Wednesday would cancel out any cooling effects of the marine layer, causing coastal areas to record some of the highest temperatures of the year would.

There will be slight relief along the coast starting Wednesday, but hot and dry conditions will continue across the region over the next few days, along with increased fire weather concerns, the service said.

Triple-digit temperatures will be seen in many inland locations for the remainder of the week, along with increasing fire weather concerns as fuels continue to dry out and winds gradually increase. The Weather Service has issued a fire weather advisory for portions of Monterey County on Wednesday and Thursday, with critical fire conditions possible as winds increase in the area.