San Jose is starting Monday, September 28, near 52 degrees beneath an expansive stratus deck, but the calm morning is only a brief pause before a sharp warmup. Stratus should clear earlier in the morning, with an afternoon high near 77. By the middle of the week, temperatures are expected to reach the upper 80s.
Fog Clears Before Afternoon Winds Pick Up
The National Weather Service's San Francisco office expects Monday to be the coolest day of the week, with morning stratus clearing earlier in the day. Regional onshore winds will reach 10 to 20 mph with gusts up to 30 mph Monday, according to the National Weather Service.
Monday night should stay clear, with a low near 55 degrees. The latest outlook is a meaningful shift from Hoodline's earlier weekend forecast, which had Monday closer to 80 degrees and mainly framed Tuesday as the start of the warmup; the new forecast points to a hotter stretch beginning Tuesday and lasting into the weekend, as previously reported by Hoodline.
San Jose Warms Into The Upper 80s Midweek
Tuesday, September 29, will be sunny as the warmup begins. Wednesday, September 30, is forecast near 87 degrees, followed by about 88 Thursday, October 1, under clear skies.
Friday, October 2, should be cooler, with cooler conditions continuing through Sunday. Overnight temperatures will generally settle in the mid-50s.
Fire Weather And HeatRisk Increase Across The Region
Dry, breezy conditions are raising fire-weather concerns in higher terrain through Wednesday, especially in the North Bay and East Bay interior mountains. The National Weather Service says the strongest regional winds are expected Tuesday morning, with gusts potentially reaching 30 to 35 mph in those areas.
Moderate HeatRisk is expected across inland parts of the Bay Area from Wednesday through Sunday, while the marine layer keeps coastal locations cooler. San Jose residents should plan outdoor activity around the cooler morning hours, carry water during the hotter afternoons and take extra care with anything that could spark a fire.
Minor Bayshore Flooding Possible Through Thursday
A coastal flood advisory is in effect from late Monday morning through Thursday afternoon for some bayshore locations around San Francisco Bay, San Pablo Bay and Monterey Bay. The expected flooding is minor, but low-lying shoreline areas could see water around the highest tides, making extra caution worthwhile for people parking, walking or working near the water.
