Last updated: June 24, 2025
In May, the average temperature in New Haven, United States hovers around 19°C (66°F). While temperatures can dip as low as 0°C (33°F), they can also soar to a maximum of 33°C (92°F). Be prepared for a wet month, with 125 mm (4.9 in) of precipitation expected over about 15 days. Overall, you can expect a relatively humid experience, with an average humidity level of 81%.
In May in New Haven, the average temperature is 19°C (66°F). The maximum can reach 33°C (92°F) and the minimum can be as low as 0°C (33°F). This diverse climate makes New Haven an ideal destination for travelers seeking a mix of warm and cool experiences.
In New Haven in May, the precipitation amount is 125 mm (4.9 in) over a span of 15 days.
In New Haven in May, humidity is 81%. With an average temperature of 19°C (66°F), this humidity feels like a warm, heavy blanket enveloping you, making travel feel both muggy and slightly stifling, often leading to a need for frequent breaks in the shade.
In New Haven in May, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in New Haven.
UV Risk Categories
Weather in New Haven varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in New Haven, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 0°C (33°F) | 79 mm (3.1 inches) | 88% | moderate |
| February Weather | 3°C (37°F) | 104 mm (4.1 inches) | 88% | moderate |
| March Weather | 7°C (45°F) | 133 mm (5.2 inches) | 87% | high |
| April Weather | 12°C (54°F) | 116 mm (4.5 inches) | 85% | very high |
| May Weather | 19°C (66°F) | 125 mm (4.9 inches) | 81% | very high |
| June Weather | 23°C (74°F) | 130 mm (5.1 inches) | 82% | very high |
| July Weather | 25°C (78°F) | 113 mm (4.4 inches) | 81% | very high |
| August Weather | 24°C (75°F) | 96 mm (3.8 inches) | 73% | very high |
| September Weather | 21°C (71°F) | 79 mm (3.1 inches) | 73% | very high |
| October Weather | 15°C (59°F) | 96 mm (3.8 inches) | 78% | high |
| November Weather | 6°C (44°F) | 96 mm (3.8 inches) | 89% | moderate |
| December Weather | 4°C (39°F) | 104 mm (4.1 inches) | 87% | moderate |