Bay Area/ San Jose/ Weather & Environment

San Jose Sizzles: 96-Degree Heat Wave, Fire Fears Grip South Bay

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Published on October 01, 2026
San Jose Sizzles: 96-Degree Heat Wave, Fire Fears Grip South BaySource: Terry Lucas / Wikimedia Commons

San Jose is waking to cloudy skies and temperatures around 59 degrees Thursday morning, but the gray start will not last. Sunshine is expected to push the city close to 90 degrees this afternoon, setting up an even hotter weekend across the South Bay.

The National Weather Service forecasts sunny conditions Thursday with light northwest winds, followed by a partly cloudy night and a low near 60. Friday should remain mostly cloudy but warm, with another high near 90 and no rain in sight.

Saturday Brings The Peak Heat

The hottest day of the stretch is expected Saturday, when San Jose could reach 96 degrees under sunny skies. Sunday should stay nearly as hot at 95, followed by highs around 92 Monday and Tuesday and 91 Wednesday.

Overnight lows will offer only partial relief, ranging from the low 60s Thursday night to the upper 60s over the weekend. Inland neighborhoods will run much warmer than coastal locations, where a compressed marine layer may keep mornings cooler and cloudier.

Dry Conditions Raise Fire-Weather Concerns

The weather service is warning of elevated fire-weather conditions in higher terrain as hot, dry air and poor overnight humidity recovery settle over the region. Gusts in exposed peaks could reach 45 mph, although winds in San Jose are expected to remain mostly light to moderate.

Residents heading outdoors should take extra care with grills, power tools and anything else that could spark a fire. The extended hot spell is a sharper update to Hoodline's earlier forecast, with the latest outlook now carrying significant heat through Wednesday.

Coastal Flooding Remains A Shoreline Issue

A Coastal Flood Advisory remains in effect through 5 p.m. Thursday for some low-lying locations along San Francisco Bay, San Pablo Bay and Monterey Bay. The advisory is aimed at bayshore communities rather than inland San Jose, but people walking, parking or working near the water should watch for minor flooding around high tide.