San Francisco Bay Area braces for its hottest day of 2025 as temperatures soar unexpectedly despite the onset of fall. Forecasts predict highs reaching historic levels, challenging seasonal norms.
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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.