San Francisco Braces for Late-September Temperature Spike
San Francisco Braces for Late-September Temperature Spike
US · Published Sep 30, 2026
• San Francisco is preparing for a potential temperature spike on September 29, 2026, as forecasts suggest a high near 74°F (23.3°C) at the San Francisco International Airport (KSFO) station.
• The historical average high for this date is 71°F (21.7°C), with a record high of 93°F (33.9°C).

Impact & Risks

The potential temperature increase could lead to warmer-than-average conditions for late September in San Francisco. While the forecasted high of 74°F (23.3°C) is within the climatological range, any offshore wind events or a complete burn-off of the marine layer could push temperatures into the upper 70s or beyond. This could result in discomfort for residents unaccustomed to higher temperatures and may increase energy demand for cooling systems. However, the likelihood of extreme heat, such as the record 93°F (33.9°C) set in 1980, remains low based on current guidance.

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