San Jose is expected to have clear skies and a sunny afternoon near 80 Sunday before a cooling trend settles in. Monday’s high is forecast near 70, and rain chances arrive Tuesday before a wetter-looking stretch midweek.
The cooling shift reflects a broader pattern change: weakening high pressure is allowing the marine layer to reform as breezier onshore winds develop, while an upper-level trough digs into the region early in the week. The National Weather Service expects the cooling trend to continue through the workweek, with light showers possible around midweek. The agency’s Sunday forecast discussion describes the pattern as a transition from the recent warmth to cooler conditions.
Monday will be partly sunny with a high near 70.
Fog And Showers Build Midweek
Monday night brings patchy fog and a slight chance of rain showers. Tuesday carries a 30% chance of showers with a high near 71, with rain chances continuing Wednesday and Thursday.
October showers fit San Jose’s seasonal pattern: the National Weather Service says fall rainfall is infrequent and most storms during the season bring light showers. The city also sits in the rain shadow of the Santa Cruz Mountains, receiving about one-quarter of the rainfall measured in the mountains. Fog can form in sheltered South Bay pockets such as Almaden Valley, Evergreen and Coyote Creek, though dense fog at San Jose International Airport is uncommon, the NWS climate overview for San Jose notes.
The midweek pattern looks more like intermittent light rain than an all-day washout, but morning visibility could be reduced by fog. Skies are expected to be mostly sunny again Friday, with a high near 70; the San Jose point forecast puts Friday’s high in the lower 70s.
Coastal Conditions Remain Dangerous
The beach warning covers Pacific Coast beaches and remains in effect through 9 p.m. Sunday. The National Weather Service warns of breaking waves of 7 to 12 feet, with an increased risk of sneaker waves and strong rip currents that can sweep people off beaches, rocks and jetties. The agency advises staying out of the water and away from jetties, piers and rocks while the Beach Hazards Statement is in effect.
Anyone trading South Bay sunshine for the Pacific coast should take extra care Sunday, as hazardous beach conditions are expected.
