Climate Overview
The climate in San Francisco Airport is temperate. The average annual temperature is 15°C and approximately 1936mm of precipitation falls per year. San Francisco Airport receives a notable amount of rainfall throughout the year, including during its driest month. San Francisco Airport sits near the equator, so seasonal temperature differences are minimal throughout the year.
Temperature
San Francisco Airport sees moderate temperature variation throughout the year, ranging from 8°C to 21°C. November is the warmest month, though highs remain moderate at 21°C with a mean of 15°C. July is the coolest month, with minimum temperatures around 8°C and an average of 13°C. On average, daily temperatures fluctuate by about 10°C between overnight lows and afternoon highs.
Precipitation
San Francisco Airport is a fairly wet location, receiving approximately 1936mm of precipitation annually, which averages out to around 161mm per month. The wettest month is December, averaging 272mm of rainfall. February and January also tend to see above-average precipitation. The driest month is July, with just 30mm. That's 241mm less than December, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.
Wind
San Francisco Airport is relatively calm, with an average annual wind speed of 3km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is August, averaging 4km/h, though still comfortable for most outdoor activities. The calmest conditions occur in February, with average winds dropping to 3km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 1km/h gap between the calmest and windiest months.
Seasons
87 days until Summer
It is currently spring in San Francisco Airport, which began on September 23, 2026. San Francisco Airport sits near the equator, so the traditional four-season cycle is less pronounced. Temperatures remain relatively stable year-round. The warmest period peaks in November at around 21°C, while the coldest stretch bottoms out in July near 8°C. Summer is next, beginning on December 21, 2026 (87 days from now).
Spring
Temperatures range from 9 to 21°C. Rainfall is heavy, totalling around 478mm across the season with a monthly average of 159mm. Winds are generally light, averaging 3km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 11 to 21°C. Rainfall is heavy, totalling around 808mm across the season with a monthly average of 269mm. Winds are generally light, averaging 3km/h. Comfortable clothing with a light layer for cooler evenings is all you need.
Autumn
Temperatures range from 10 to 20°C. Rainfall is heavy, totalling around 520mm across the season with a monthly average of 173mm. Winds are generally light, averaging 3km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 8 to 20°C. Rainfall is relatively light, with around 129mm over the season and a monthly average of 43mm. Winds are generally light, averaging 4km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.
Monthly Climate Data
The table below shows monthly climate averages for San Francisco Airport based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.
