The highest day temperature in May 2026 was 81°F. The lowest night temperature was 48°F. The average values for day and night temperatures during May were 64.4°F и 52.9°F respectivly.

The average sea surface temperature in May 2026 for San Francisco was 59.4°F. The maximum and minimum values were 56.0°F and 61.2°F respectively.

Most of the days in May are sunny but you can also expect cloudy and gloomy days.

Precipitation total in May for San Francisco is 0.4 in.

The average wind speed in May is 9.9 mph. This value is relatively stable throughout the year.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for San Francisco in May is 9.6 hours.