Weather in San Francisco in May 2025
Average weather
Average temperature in San Francisco in May
Going from a maximum of +77°F during the day to a minimum of +48°F during the night, the temperature in May averages around +64°F.
The average maximum temperature goes up 0% by the end of the month, compared with the beginning of the month, from +63°F to +63°F.
Is San Francisco warm or cold in May?
San Francisco is typically mild in May.
Maximum temperatures go up compared to the previous month from +66°F to +68°F. The minimum temperature also goes up from +50°F to +52°F.
Pack a light jacket as it will be warm in the day and cool in the evenings.
Take a look at how May is compared to other months in San Francisco:
Water temperature in San Francisco in May
Water in San Francisco in May is Cold. It varies from +49°F to +56°F, with an average of +53°F. The air temperature averaging +68°F is higher than the water temperature.
The water temperature in May is one of the coldest of the entire year:
Can you swim in San Francisco in May?
Climate in San Francisco in May
| April | May | June | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +66°F | +68°F | +73°F | ||||
| Min. temperature | ||||||
| +39°F | +45°F | +46°F | ||||
| Max. temperature | ||||||
| +86°F | +91°F | +97°F | ||||
| Rainfall | ||||||
| 36 mm | 16 mm | 3 mm | ||||
| Wind | ||||||
| 3 m/s | 3 m/s | 3 m/s | ||||
| Avg. water temperature | ||||||
| +53°F | +53°F | +52°F | ||||
| Humidity | ||||||
| 78% | 79% | 79% | ||||
| Air pressure | ||||||
| 1016 HPa | 1014 HPa | 1013 HPa | ||||
| Sunny days | ||||||
| 8 | 9 | 11 | ||||
| Cloudy days | ||||||
| 14 | 17 | 17 | ||||
| Rainy days | ||||||
| 8 | 4 | 1 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
May weather is still as good as in April. It’s getting warmer as May arrives. The average maximum temperature goes up from +66°F to +68°F during the day. As May arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 36 mm to 16 mm. Humidity rises from 78% to 79%. The average wind speed doesn’t change much during May, staying around 3 m/s. The good news is there are likely to be more sunny days in May, from 8 to 9.
June brings much the same weather, it remains good.
Wind
The average wind speed is 1 m/s getting up to 6 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in San Francisco is gradually decreasing during May, going from 6 m/s to 1 m/s over the course of the month.
Rain
How was the weather last May in San Francisco?
Climate Change Over the Years
The climate in San Francisco in May has not changed that much over the last 43 years.
The average temperature was the lowest in 1982 (+65°F) and the highest in 2014 (+70°F). The driest year was 2013 with only 127 mm of rainfall, and the wettest year was 1983 with 1162 mm.
FAQ
Is May a good time to visit San Francisco?
Can you sunbathe in San Francisco in May?
Can you swim in San Francisco in May?
Is San Francisco rainy in May?
Is it sunny in San Francisco in May?
Other cities in USA
Monthly weather in San Francisco
Source of the data
For this page, we’ve looked at the typical weather in San Francisco, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.