San Francisco Weather in May
San Francisco in May sees pleasant daytime temperatures of 19°C (66°F) and nighttime lows of 11°C (52°F). With just 7.1 mm (0.3 in) of rainfall expected, it's a dry month overall.
Rainfall in San Francisco in May
You can expect rain on around 2 days based on historical patterns, with 7.1 mm (0.3 in) average for the month. Rain days are few and the total is low, so this is a largely dry month. Any showers that do occur tend to be brief.
Temperature in San Francisco in May
Weather in San Francisco is at its perfect in May. Highs reach 19°C (66°F), while nights settle around 11°C (52°F). Even when the weather is stable, mornings and evenings can still feel distinctly cool. Nights drop to around 11°C (52°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.
Sunshine in San Francisco in May
The days are predominantly sunny, with an estimated total of around 324 hours of sunshine. These sun-filled days are perfect for playing sports, visiting parks, or going for a bike ride.
Wind Speed in San Francisco in May
Average wind conditions reach 6 m/s (12 knots) in May. This creates notably windy weather that is clearly felt and can influence daily activities. Keep in mind this is an average. Some days are less intense, while others can be quite gusty.
Average water temperature in May
At 13°C (55°F), the water is cool but manageable for those who don't mind a bit of a shock getting in. Most people adjust after a few minutes.If your ideal day consists of dry skies and pleasant temperatures, May, June, July, August, September and October typically offer the best circumstances for San Francisco.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our San Francisco's climate page.
San Francisco Temperature in May
Min Temperature
11°C (52°F)
Max Temperature
19°C (66°F)
Water Temperature
13°C (55°F)
Chance of Rain
8%
Precipitation
7.1 mm (0.3 in)
Rainy days
2 days
Humidity
72%
Windspeed
6 m/s (12 knots)
Sunshine
324 hours
Percentage Sunshine
73%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in San Francisco typically stay consistent throughout May, with daily highs averaging around 19°C (66°F). Nights are cool, with lows around 11°C (52°F).
Average temperatures in May
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in May
Historical weather for San Francisco in May
Browse day-by-day weather records for San Francisco spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
San Francisco historical weather extremes in May
Our historical data for San Francisco spans 1976 to 2026, revealing these weather extremes.
- On May 27, 1984, temperatures climbed to 36°C (97°F), marking the warmest May day on record.
- The coldest May day was on May 24, 2009, with a maximum of 12°C (54°F).
- The coldest night in May in San Francisco was on May 28, 1977, with a minimum of 5°C (41°F).
Best Places in the United States of America in May
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in May →
perfect weather
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unpleasant
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What to Wear in San Francisco in May
Comfortable temperatures call for an easy wardrobe in May. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Dry conditions mean you won't need to worry about rain protection. Expect water temperatures of around 13°C (55°F), which is definitely too cold for comfortable swimming. Your luggage space is better used for other items. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.What To Do in San Francisco in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our San Francisco's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full San Francisco climate overview or explore weather in the United States of America.
