Bay Area weather forecast predicts a warm start to the week with potential showers and isolated thunderstorms midweek.

San Francisco could record back-to-back 80-degree days for the first time this year. Triple-digit temperatures are forecast for some inland Bay Area cities.

Daytime highs will reach the 70s and 80s along the coast and around the Bay, and into the 90s inland. Lows will be in the 50s and 60s, with light winds of 5-10 mph expected all Monday.

Hot weather has arrived and high temperatures will be about 10 degrees above average in the 80s and 90s through Wednesday before cooler conditions and chances of lighting later this week from what was once Tropical Storm Mario.

San Francisco weather forecast shows a shift to drier, warmer conditions with potential wildfire smoke haze but no ground-level smoke expected.

Warmer than normal temperatures are descending on the Bay Area early this week but will give way to the potential for monsoonal thunderstorms and lightning strikes by Friday, the National Weather Service announced Monday.

If you feel like it's very humid in the Bay Area right now, you're not alone. Here's how long it will last and when rain will move in.

Above-normal temperatures, low relative humidity and the impending risk of thunderstorms will combine to create potentially disastrous wildfire conditions in the Bay

On Tuesday at 2:54 a.m. a dense fog advisory was released by the NWS San Francisco CA in effect until 10 a.m. for San Francisco Peninsula Coast and Northern Monterey Bay.

KRON4's John Shrable has your morning forecast for Friday, Sept. 12, 2025 <a href="https://www.kron4.com/news/bay-area/san-francisco-weather-update/">https://www.kron4.com/news/bay-area/san-francisco-weather-update/</a>