Bay Area/ San Jose/ Weather & Environment

San Jose Turns Cooler Tuesday as Midweek Cooling Continues

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Published on September 15, 2026
San Jose Turns Cooler Tuesday as Midweek Cooling ContinuesSource: Google Street View

San Jose is waking up Tuesday as early clouds and marine-layer conditions figure into the forecast. The bigger story is a transition toward cooler weather, with onshore flow and a cooling trend through midweek.

Tuesday Turns Cooler, Breezier By Afternoon

The National Weather Service discussion mentions high clouds early Tuesday and increasing onshore flow later. Temperatures should be 3 to 5 degrees lower than Monday, followed by a partly cloudy night with a low around 55 degrees.

Wednesday brings continued cooling, with gusty onshore conditions possible. Greater coverage of stratus and fog is expected to return Tuesday night and Wednesday morning, and stronger winds may occur along the coast, inland valleys, and gaps and passes.

Marine-Layer Conditions Continue Midweek

Marine-layer conditions are expected to deepen Wednesday into Thursday, followed by a late-week warming trend.

Interior locations should return to the 80s next weekend as seasonal warming develops late in the week and continues into the weekend, following the warmer pattern tracked in an earlier Hoodline forecast.

No Rain For San Jose, Coastal Boaters Face An Advisory

Patchy light coastal drizzle is possible. No watches or warnings are listed for Santa Clara County in the current outlook. A Small Craft Advisory remains posted for portions of the coastal waters through Wednesday, a concern for boaters rather than everyday San Jose travel.