Bay Area residents can expect a notable uptick in temperatures as the work week begins, with forecasts showing highs surging 10-15 degrees above the norm for many inland locations. According to the National Weather Service in San Francisco, the warm spell will start on Monday, pushing daytime temperatures well above typical mid-September readings.
While Sunday offered a respite with close-to-normal weather patterns, the impending heat wave appears to be a significant shift from the chilly front that has kept us cool. "Temperatures around or slightly below normal today," the NWS San Francisco notes, implying a marked change as we segue into the week. "Much warmer temperatures for the first half of the upcoming work week" will inevitably make headlines and test our collective tolerance for heat.
As inland communities brace for the increase in mercury, a "Moderate HeatRisk" alert has been issued for the early part of the week, signaling potential health risks associated with the hotter conditions. In a social media post by the NWS Bay Area, they highlighted the same sentiment, cautioning about the amplified heat especially in "pockets of Moderate HeatRisk."
The weekend ends with pleasant seasonal temperatures today but the first half of the upcoming work week will see daytime highs jump 10-15 degrees above normal across much of our interior, with pockets of Moderate HeatRisk. #CAwx pic.twitter.com/xnETH2iE0v
— NWS Bay Area 🌉 (@NWSBayArea) September 14, 2025
Regarding specific temperature forecasts, the NWS update suggests, "High temperatures Tuesday and Wednesday will run roughly 10 to 15 degrees above normal across the interior." The East Bay Hills, South Bay, Santa Cruz mountains, and southern Monterey County are especially mentioned.
