Record-breaking warm weather was expected to hit 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 has issued an excessive heat warning for dangerous, life-threatening heat for most of the Bay Area, including the Marin and Sonoma Coastal Ranges, the North Bay interior mountains, East Bay Hills and interior valleys, the Bay coastline of San Francisco, and Santa Clara Valley. The warning applies until Wednesday 11 p.m.
In San Francisco, where some parts of the city could reach as high as 96 degrees, the excessive heat warning is in effect Tuesday from 10 a.m. to 8 p.m. The record high for San Francisco on October 1 was 97 degrees in 1980. The hottest day on record in the city was 106 degrees on September 1, 2017.
San Jose is expected to reach a high of 100 degrees on Tuesday and 101 degrees on Wednesday. The hottest October 1 in San Jose was in 1980 when the thermometer reached 97 degrees; the hottest October temperature in San Jose was 101 degrees on October 5, 1987.
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Other areas not under a heat warning are under a heat warning until 11 p.m. Wednesday, including the North Bay coast, the Peninsula coast, the Monterey Bay and Salinas Valley, and large parts of the Central Valley.
Tuesday’s daytime highs will be mainly in the 70s to low 90s along the coast, in the 80s to 100s around the bay and around 100 degrees inland. Overnight lows will mainly be in the mid to upper 60s.
The Weather Service said in its daily forecast discussion that high pressure over the region and steady offshore currents Tuesday through early Wednesday will offset any cooling effects from the marine layer, causing coastal areas to see some of the hottest temperatures of the year.
There will be some relief along the coast from Wednesday, but warm and dry conditions will persist across the region in the coming days, along with increased firefighting concerns, the agency said.
The rest of the week will see triple-digit temperatures in many inland locations, along with increasing firefighting concerns, as fuels continue to dry and winds will gradually increase. The Weather Service issued a Fire Weather Watch for parts of Monterey County on Wednesday and Thursday due to possible critical fire conditions as winds increase in that area.
