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Climate & Weather Averages in San Francisco, California, USA. Currently: 54 °F. Passing clouds. (Weather station: San Francisco International Airport, USA). See more current weather.
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 weather averages and climate San Francisco, California. Monthly temperature, precipitation and hours of sunshine. A climate graph showing rainfall, temperatures and normals.
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).
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.
Feb 9, 2024 · 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.
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.
