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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.
Spanning March through May, the city experiences average high temperatures ranging from 60.1°F (15.6°C) to 65.7°F (18.7°C) and lows dawdling between 46.9°F (8.3°C) and 50.5°F (10.3°C). Rainfall significantly decreases during this period, falling from 0.87" (22mm) in March to 0.35" (9mm) by May.
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).
Plan your visit with detailed insights on the climate in San Francisco (CA) by month. Get accurate forecasts for San Francisco temperature & weather by month, days, & hours
Every day in San Francisco normally warms to over 40 °F (4 °C), and most reach 50 °F (10 °C). The city averages just 3 days a year when the thermometer reaches into the 90s °F (over 32 °C). The temperature normally doesn't climb above 100 °F (38 °C), even on the hottest days.
Based on annual weather averages for San Francisco, the best month to go for holiday is June and July. The temperature hovers around 17°c. The table below displays max and min temperature and rain data for the whole year as an average taken from last 12+ years of historical data for San Francisco. Average Weather in San Francisco in April.
