San Francisco Experiences Final Burst of October Heat Before Pacific Cool Down
San Francisco is experiencing a brief, late-season heat wave that will peak on Friday before a dramatic shift brings much cooler temperatures, offshore wind shifts, and eventual rain to the Bay Area, sfchronicle.com reported. The two-day warm spell pushes consecutive 80-degree days into a rare late-October window not seen in downtown San Francisco since Oct. 18–19, 2023, when temperatures reached 84 and 87 degrees.
Temperatures Peak Across the Bay Area on Friday
High temperatures on Friday climb a few degrees above Thursday’s totals. San Francisco and Oakland reach the mid-to-upper 80s, while parts of San Francisco and normally cooler western neighborhoods jump into the low 90s, yahoo.com reported. The South Bay reaches the low 90s, and interior locations climb into the mid-90s in Santa Rosa and Walnut Creek. Strong offshore winds keep the usual cooling sea breeze at bay through the morning.
These gusty northeast winds create elevated fire-weather concerns in the North Bay interior hills and mountains. Winds are expected to slowly subside, allowing the red flag warning for the North Bay interior hills to lapse at 11 a.m. Very dry air, hot temperatures, and dry vegetation keep fire danger elevated in the North Bay and East Bay hills through much of Friday, sfchronicle.com reported.
Weekend Weather Transition Brings Onshore Breezes
The weather pattern begins changing Saturday as offshore winds subside and a typical onshore breeze returns. Saturday features mostly sunny skies with temperatures still reaching the low 80s in San Francisco and Oakland, while interior locations peak in the low 90s. Sunday marks the beginning of a more substantial cooldown as a stronger sea breeze pushes cooler ocean air 10 to 15 degrees lower across many locations.
Sunday brings afternoon highs in the mid-to-upper 60s in San Francisco, mid-to-upper 70s inland, and mid-70s near North Bay pumpkin patches. By Monday, an upper-level storm system swings down the West Coast, capping regional temperatures in the 50s and 60s and setting up a chance for widespread light rain on Tuesday and Wednesday.
Frequently Asked Questions
When did downtown San Francisco last record consecutive 80-degree days this late in October?
Downtown San Francisco last experienced back-to-back days exceeding 80 degrees this late in the calendar during the Oct. 18–19, 2023 timeframe, when readings hit 84 and 87 degrees, according to sfchronicle.com.
When will the red flag warning expire?
The red flag warning covering the North Bay interior hills is scheduled to expire at 11 a.m. Friday as winds gradually weaken, sfchronicle.com reported.
How much cooler will temperatures be by Sunday?
A stronger sea breeze will push cooler ocean air inland on Sunday, knocking temperatures down by 10 to 15 degrees in many locations, with San Francisco highs dropping into the mid-to-upper 60s, according to yahoo.com.
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