San Jose woke up today to mostly cloudy skies and a mild 63°F at Mineta San José International, but the easy start will not last for long. Temperatures are expected to climb into the upper 70s this afternoon, with breezy northwest winds picking up later in the day. The real shift hits midweek: inland valleys are forecast to jump into the upper 80s tomorrow and peak in the mid-90s on Thursday. Coastal neighborhoods should stay noticeably cooler, with a brief shot at drizzle along the coast overnight until tomorrow morning.
Afternoon Winds Pick Up
Northwest winds will strengthen through the afternoon, with sustained speeds mostly in the single digits to low teens and gusts into the 20s across the valley. Common wind funnels, gaps and exposed bayfront spots could see even stronger bursts later in the day. Out on the water, mariners should pay close attention to Small Craft Advisories and Gale Warnings in the offshore waters, as outlined by the National Weather Service San Francisco.
Heat Risk Midweek
By midweek, temperatures will surge. Highs are expected to reach around 88°F tomorrow and about 94°F on Thursday, with the hottest interior spots potentially touching triple digits. That kind of spike brings a moderate risk of heat-related illness for sensitive groups, including older adults, young children and people who work outdoors. Anyone planning to be outside is encouraged to move strenuous activities to the coolest parts of the day, take frequent water breaks and seek air-conditioned spaces during the peak afternoon heat.
Cooling Centers And Safety
Residents in San Jose who do not have air conditioning can turn to local cooling centers and other heat-safety resources listed by the county. Hours and locations can vary, so it is worth checking details before heading out. For an updated list of respite locations and practical heat tips, see Santa Clara County heat resources. Officials also stress basic safety: never leave children or pets in parked cars, even for a short time, and check on vulnerable neighbors during the hottest part of the afternoon.
Marine And Fire Concerns
Conditions offshore will be rough. Small Craft Advisories are in effect for portions of Monterey Bay, and gale conditions are possible in the outer waters from tomorrow night into early Thursday. On land, forecasters note that gusty northerly winds combined with very low humidity from tomorrow into Thursday could lead to elevated to near-critical fire weather in interior North Bay areas and the Diablo Range. Gusts of 25 to 35 mph are expected to spread through those regions, with a few isolated stronger gusts possible. Officials advise extra caution with any outdoor burning or equipment that might spark, and recommend that residents in hillier areas or near wildland fuels stay tuned for updates.
