San Francisco weather in May
Long-run climate averages for San Francisco, CA in May, plus what the forecast models say for the days ahead.
In May, San Francisco averages 62°F by day and 52°F at night. The wettest month is usually January.
May in San Francisco averages a daytime high of 62°F and an overnight low of 52°F, which reads as mild for this part of the world. Across the whole year San Francisco sees roughly 33 inches of precipitation.
Climate averages tell you what to pack. They do not tell you what next Tuesday looks like - for that, see the live San Francisco forecast with every model compared and how much they currently agree.
San Francisco weather by month
what to expect in San Francisco through the yearHere is San Francisco's typical weather in each month: the average daytime high and overnight low in °F, how each month feels, and the wettest month marked. Use it to plan any trip to San Francisco by season.
Bottom line: over the last 30 days the European model has been the most accurate forecast for San Francisco, scoring 90/100 on our CheckWeather Score, ahead of the American at 77. See the full US accuracy scoreboard for exactly how every model is tested.
Common questions
How warm is San Francisco in May?
Is May a good time to visit San Francisco?
Does it rain a lot in San Francisco in May?
Climate averages from ERA5 reanalysis. Model accuracy re-scored over a rolling 30 days. Page updated .