Water temperature in San Francisco (CA) in May
Is it warm enough to swim in San Francisco in May? Average water temperature in San Francisco in May is 52.2°F and therefore is not suitable for comfortable swimming. The warmest sea in San Francisco in May is 57°F, and the coldest is 48.4°F. Average high air temperature in San Francisco in May is 64°F, and average low temperature is 51°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in San Francisco
Changes water temperature in San Francisco in May 2025, 2024
To get an accurate forecast for the water temperature in San Francisco for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in San Francisco, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of May.
You can choose any other years:
| Day | 2025 | 2024 | Min | Max |
|---|---|---|---|---|
| May 1 | 53.8°F | 50.5°F | 50°F | 56.3°F |
| May 2 | 53.4°F | 50.2°F | 49.8°F | 56.8°F |
| May 3 | 52.7°F | 49.8°F | 49.8°F | 55.9°F |
| May 4 | 51.4°F | 50.4°F | 49.6°F | 55.2°F |
| May 5 | 50.9°F | 50°F | 49.5°F | 55°F |
| May 6 | 50.7°F | 50.9°F | 50°F | 54.9°F |
| May 7 | 51.3°F | 50.9°F | 49.6°F | 54.9°F |
| May 8 | 51.3°F | 50.9°F | 48.7°F | 55.2°F |
| May 9 | 51.3°F | 51.1°F | 48.9°F | 55.4°F |
| May 10 | 50.9°F | 52°F | 49.5°F | 55.6°F |
| May 11 | 53.4°F | 53.2°F | 49.1°F | 55.9°F |
| May 12 | 55.2°F | 50.9°F | 48.7°F | 56.3°F |
| May 13 | 55°F | 51.1°F | 48.9°F | 56.5°F |
| May 14 | 55.2°F | 51.8°F | 50°F | 56.3°F |
| May 15 | 54°F | 52.3°F | 50.2°F | 57°F |
| Day | 2025 | 2024 | Min | Max |
|---|---|---|---|---|
| May 16 | 52.5°F | 49.6°F | 49.6°F | 55.8°F |
| May 17 | 52.9°F | 49.1°F | 49.1°F | 55.9°F |
| May 18 | 51.6°F | 50.5°F | 50.2°F | 56.8°F |
| May 19 | 51.3°F | 53.2°F | 49.8°F | 56.7°F |
| May 20 | 50.7°F | 52.3°F | 49.6°F | 55.8°F |
| May 21 | 51.1°F | 52°F | 49.3°F | 55.6°F |
| May 22 | 50.7°F | 51.6°F | 49.3°F | 55.6°F |
| May 23 | 50.7°F | 51.8°F | 48.4°F | 55.8°F |
| May 24 | 50.9°F | 52°F | 48.6°F | 56.3°F |
| May 25 | 51.1°F | 52°F | 49.3°F | 54.9°F |
| May 26 | 51.3°F | 51.6°F | 49.6°F | 54.3°F |
| May 27 | 51.1°F | 51.8°F | 49.3°F | 54.5°F |
| May 28 | 52.5°F | 51.1°F | 50.4°F | 54.3°F |
| May 29 | 52°F | 50.9°F | 50.5°F | 54.7°F |
| May 30 | 49.8°F | 51.6°F | 49.8°F | 54.3°F |
| May 31 | 52.7°F | 52°F | 50.4°F | 55°F |
Average water temperature in San Francisco in May over a decade
| 2016 | 2017 | 2018 | 2019 | 2020 |
| 54.3°F | 52.5°F | 53.1°F | 54.9°F | 53.8°F |
| 2021 | 2022 | 2023 | 2024 | 2025 |
| 50.5°F | 50.5°F | 53.2°F | 51.3°F | 52°F |
San Francisco sea state in May
Chart comparing the height of waves in San Francisco in May over the past years. The red line indicates the height of the waves when swimming in the sea is prohibited. To view the current sea conditions, click on the graph.
Weather and climate in San Francisco in May
This data display average monthly climate indicators in San Francisco in May based on our historical weather readings over a period of ten years. In addition to temperature, we include data on the number of rainy and sunny days so you can have all the information about your destination before your trip
- Average HIGH temperature64°F
- Average LOW temperature51°F
- Average rainfall days4 days
- Average rainfall8mm/0.3''
- Average daylight14h
- Average sunshine10.5h
- Average UV index8
San Francisco water temperature during other months:
You can also view information about water temperature for other months by clicking on the month button below
