San Francisco Unlikely to Hit 80°F on September 23, 2026
Forecast models for San Francisco indicate that the high temperature on September 23, 2026, is unlikely to reach 80°F (26.7°C). According to AccuWeather's monthly model, daily highs for September 2026 are expected to range between 63°F and 73°F (17.2°C to 22.8°C). The National Weather Service (NWS) extended forecast through September 26, 2026, does not signal any significant warming event near the 23rd. Historically, late September temperatures in San Francisco average well below 80°F due to the city's coastal location and marine influence. While there is a 30% chance of temperatures falling between 80°F and 81°F (26.7°C to 27.2°C), the majority of outcomes favor cooler conditions.
