Water temperature in San Diego (CA) in May
Is it warm enough to swim in San Diego in May? Average water temperature in San Diego in May is 63°F and therefore is not suitable for comfortable swimming. The warmest sea in San Diego in May is 68°F, and the coldest is 57.4°F. Average high air temperature in San Diego in May is 69°F, and average low temperature is 59°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in San Diego
Changes water temperature in San Diego in May 2025, 2024
To get an accurate forecast for the water temperature in San Diego 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 Diego, 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 | 61°F | 62.1°F | 57.4°F | 66°F |
| May 2 | 61°F | 63.1°F | 58.1°F | 67.3°F |
| May 3 | 60.6°F | 63.7°F | 59.2°F | 66.9°F |
| May 4 | 59.5°F | 63.7°F | 59.5°F | 67.3°F |
| May 5 | 60.6°F | 63.1°F | 59.7°F | 67.3°F |
| May 6 | 61.2°F | 62.4°F | 59.2°F | 66.7°F |
| May 7 | 61.2°F | 62.2°F | 59.4°F | 66.4°F |
| May 8 | 61°F | 62.1°F | 60.1°F | 68°F |
| May 9 | 61.2°F | 62.4°F | 60.8°F | 67.6°F |
| May 10 | 61.2°F | 62.6°F | 60.4°F | 66.7°F |
| May 11 | 62.8°F | 62.8°F | 60.3°F | 67.5°F |
| May 12 | 63°F | 63°F | 60.1°F | 67.6°F |
| May 13 | 62.2°F | 63°F | 60.1°F | 67.3°F |
| May 14 | 61.2°F | 62.2°F | 60.3°F | 66.6°F |
| May 15 | 62.1°F | 61°F | 59.9°F | 66.4°F |
| Day | 2025 | 2024 | Min | Max |
|---|---|---|---|---|
| May 16 | 62.2°F | 61°F | 59.2°F | 66.4°F |
| May 17 | 61.5°F | 61.9°F | 58.8°F | 66.9°F |
| May 18 | 61.7°F | 62.6°F | 58.8°F | 67.1°F |
| May 19 | 62.6°F | 63.1°F | 58.8°F | 65.7°F |
| May 20 | 64.2°F | 63°F | 59°F | 65.8°F |
| May 21 | 64.9°F | 63.5°F | 59.5°F | 66.2°F |
| May 22 | 64.9°F | 63.9°F | 59.5°F | 66°F |
| May 23 | 64.9°F | 63.3°F | 60.1°F | 65.5°F |
| May 24 | 65.1°F | 63.7°F | 59.9°F | 65.1°F |
| May 25 | 66°F | 63°F | 60.4°F | 66°F |
| May 26 | 66.6°F | 62.4°F | 60.8°F | 66.6°F |
| May 27 | 66.7°F | 62.8°F | 60.4°F | 67.5°F |
| May 28 | 66.7°F | 61.9°F | 60.8°F | 66.7°F |
| May 29 | 66.2°F | 61.7°F | 60.4°F | 66.7°F |
| May 30 | 65.8°F | 62.1°F | 61°F | 67.3°F |
| May 31 | 65.8°F | 62.1°F | 61.5°F | 67.6°F |
Average water temperature in San Diego in May over a decade
| 2016 | 2017 | 2018 | 2019 | 2020 |
| 64.4°F | 63.5°F | 62.4°F | 62.1°F | 66.6°F |
| 2021 | 2022 | 2023 | 2024 | 2025 |
| 62.8°F | 62.2°F | 61.3°F | 62.6°F | 63.1°F |
San Diego sea state in May
Chart comparing the height of waves in San Diego 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 Diego in May
This data display average monthly climate indicators in San Diego 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 temperature69°F
- Average LOW temperature59°F
- Average humidity
71 - Average rainfall days1 days
- Average rainfall5mm/0.2''
- Average daylight14h
- Average sunshine8.1h
- Average UV index9
San Diego water temperature during other months:
You can also view information about water temperature for other months by clicking on the month button below
