The San Francisco Bay Area is experiencing its hottest day of 2025 despite the official start of fall. Temperatures are expected to reach record highs, impacting residents and prompting heat advisories.
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California stays unusually cool as much of the U.S. faces a heatwave, thanks to coastal fog, Pacific Ocean currents, and marine layer patterns, which help moderate temperatures, especially around the Bay Area.
San Francisco is experiencing an unusual heatwave this week, ranking among the warmest cities in the U.S. Experts link the spike to broader climate crisis trends impacting weather patterns nationwide.