Northern California is once again feeling the effects of a fall heat wave on Monday, peaking on Tuesday and keeping temperatures above normal throughout the week.

The National Weather Service issued a heat warning for the entire Bay Area, the Central Coast and most of the Central Valley, starting at 11 a.m. Monday and continuing through 11 p.m. Wednesday. The weather service warned that a moderate to major heat risk would likely result in a variety of heat-related impacts for those who are sensitive to hot weather or do not have access to adequate cooling.

In the Bay Area, high temperatures are 70 to 90 degrees on the coast, 80 to 90 degrees around the bay, and 90 to 100 degrees inland. The weather service said offshore winds were relatively light, with high afternoon temperatures expected to trigger a sea breeze in the late afternoon that would bring some relief along the coast in the evening.

Record temperatures are possible over the next few days, particularly on Tuesday when the peak of the heatwave will be felt.

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Fire hazards are prevalent at higher elevations where gusts of wind may occur along mountain peaks and passes. The weather service said most areas above 2,000 feet will see average temperatures of 70 degrees throughout the night and red flag warnings may be issued for stronger than expected winds.

The conditions also prompted Pacific Gas and Electric to do so enacted another series of public safety power shutoffs for areas in Northern California at risk of wildfires. On Monday morning, PG&E shut off power to several thousand customers in Butte, Shasta, Glenn and Tehama counties. The list of counties under a PSPS alert also includes Alameda, Contra Costa and Sonoma counties.

The weather service said onshore winds are expected to return Wednesday afternoon, providing relief to coastal areas through Thursday and helping to ease fire weather concerns. However, temperatures inland will remain 15 to 20 degrees above normal through the weekend and early next week.