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Currently: 74 °F. Sunny. (Weather station: San Francisco International Airport, USA). See more current weather. Annual Weather Averages Near San Francisco. Averages are for San Francisco International Airport, which is 11 miles from San Francisco. Based on weather reports collected during 1992–2021. Showing: Weather by CustomWeather, © 2024.
The hottest month of the year in San Francisco is September, with an average high of 72°F and low of 58°F. The cool season lasts for 2.0 months, from December 3 to February 4, with an average daily high temperature below 59°F. The coldest month of the year in San Francisco is January, with an average low of 46°F and high of 57°F.
San Francisco Climate Graph - California Climate Chart. San Francisco weather averages and climate San Francisco, California. Monthly temperature, precipitation and hours of sunshine. A climate graph showing rainfall, temperatures and normals.
San Francisco averages just three days a year when the temperature reaches 90 degrees Fahrenheit, and even fewer over 100 (38 °C). No matter how warm the day, at night the temperature always cools to less than 70 degrees. The city's hottest days usually occur in September and October.
Throughout the year, there is a fluctuation in average temperatures by 7.5 °C | 13.5 °F. The month of highest relative humidity is February (80.28 %). The month with the lowest relative humidity is June (68.77 %). The month which sees the most rainfall is January (0.17 days).
Here is the average precipitation. Winter, from December to mid-March, is mild and quite rainy. There are, however, sunny and dry periods, sometimes long. Very cold days are rare: at most, the temperature can approach freezing (0 °C or 32 °F) during the night, and only on colder periods it remains about 8/10 °C (46/50 °F) during the day.
Throughout the year, San Francisco experiences fairly consistent temperatures, with monthly averages hovering between 45.9°F (7.7°C) and 72.5°F (22.5°C). Relative humidity remains quite steady, oscillating around the 70% mark all year round, contributing to a humid and pleasant climate.
