Port Jefferson Weather in May
What's the weather like in Port Jefferson (New York) in May 2025?
The climate in Port Jefferson during May can be summarized as mild and a little damp.
May is in the spring in Port Jefferson and is typically the 5th warmest month of the year. Daytime maximum temperatures average around 20°C (69°F), whilst at night 9°C (49°F) is normal.
| Daytime temperature | 20.3°C 68.5°F |
|---|---|
| Nightly temperature | 9.3°C 48.7°F |
| Average temperature | 14.8°C 58.6°F |
| Daily sunshine | 9 hrs |
| Avg rainfall | 96 mm 3.8 ins |
| Rainy days | 11 days |
| Sea temperature | 11.2°C 52.2°F |
| Humidity | 70% |
| Windspeed | 18kph 11 mph |
On average May is the 6th wettest month of the year in Port Jefferson with around 96mm 3.8 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 11 days, although this may vary considerably.
On the flip side this corresponds to an average of 9 hours of sunshine per day.
May temperatures in Port Jefferson
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 Port Jefferson in May 2025.
Other monthly averages
Port Jefferson weather stats
| Hottest month: | July | 27.6°C 81.7°F |
|---|---|---|
| Driest month: | February | 84mm 3.3ins |
| Sunniest month: | August | 9.1hrs |
| Coldest month: | January | 2.9°C 37.2°F |
| Wettest month: | November | 107mm 4.2ins |
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