The National Weather Service (NWS) San Francisco has warned about hazardous heat conditions that persist through Saturday, particularly in parts of the Interior Central Coast, Santa Clara Valley, and Interior East Bay Valleys. Residents are advised to consider postponing or rescheduling outdoor activities, especially during peak heat hours. The National Weather Service recommends drinking plenty of water, taking breaks in shaded areas if outdoor activity is unavoidable, and staying cool during the warmest parts of the day and evening.
The NWS also provides a glimpse into the short-term weather outlook, as discussed in the Area Forecast Discussion. The forecast indicates a continuation of warm and dry conditions for the region up to Saturday, with an expected cooling trend beginning on Sunday. However, it's anticipated that not all record temperatures will be threatened, as past warmth earlier in the year has seen similar or higher temperatures, except for San Jose. A moderate "HeatRisk" alert is in place for the Southern Salinas Valley, with minor HeatRisk levels elsewhere.
In addition to the heat advisory, the North Bay interior valleys were briefed with a dense fog advisory effective until 9 AM this morning, per a social media post from NWS Bay Area. The fog contributed to lower visibility, potentially impacting travel and morning commutes.
🌫️A dense fog advisory has been issued for the North Bay interior valleys through 9 AM this morning. pic.twitter.com/U6lvBTy42D
— NWS Bay Area 🌉 (@NWSBayArea) May 8, 2025
Heading into the longer term, beginning Friday and transitioning into next week, temperatures across the region will decline significantly, potentially dipping 10 to 20 degrees below normal. With the shift in weather, winds and fire weather become the center of concerns, as stated in the NWS's extended forecast discussion. Notably, the Oakland Museum could approach its daily minimum temperature records set back in 1974 by the following Tuesday and Wednesday. Maritime interests should also note that a weak front will dissipate with high pressure building in from the north, leading to moderate northerly flows and slightly stronger winds north of Point Reyes and along the Big Sur coast, as mentioned in the marine forecast of the National Weather Service.
