San Juan Weather in May
What's the weather like in San Juan (San Juan) in May 2025?
The climate in San Juan during May can be summarized as hot, humid and wet.
May is in the spring in San Juan and is typically the 6th warmest month of the year. Daytime maximum temperatures average around a steamy 30°C (85°F), whilst at night 22°C (72°F) is normal.
| Daytime temperature | 29.5°C 85°F |
|---|---|
| Nightly temperature | 22.4°C 72.2°F |
| Average temperature | 25.9°C 78.6°F |
| Daily sunshine | 8.7 hrs |
| Avg rainfall | 182 mm 7.1 ins |
| Rainy days | 16 days |
| Sea temperature | 27.5°C 81.4°F |
| Humidity | 76% |
| Windspeed | 15.1kph 9 mph |
On average May is the 3rd wettest month of the year in San Juan with around 182mm 7.1 inches of rain making it a wet time to visit. This rainfall is typically spread over 16 days, although this may vary considerably.
On the flip side this corresponds to an average of 8.7 hours of sunshine per day.
May temperatures in San Juan
May rainfall
May hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in San Juan in May 2025.
Other monthly averages
San Juan weather stats
| Hottest month: | August | 30.2°C 86.4°F |
|---|---|---|
| Driest month: | March | 79mm 3.1ins |
| Sunniest month: | March | 9.6hrs |
| Coldest month: | February | 26.9°C 80.4°F |
| Wettest month: | August | 195mm 7.7ins |
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