Last updated: June 24, 2025
In May, the average temperature in New Haven, United States hovers around 17°C (63°F). While you might experience a chilly minimum of -1°C (30°F), the mercury can also soar to a sweltering 34°C (94°F). Expect 127 mm (5.0 in) of precipitation spread across 14 days, contributing to an average humidity of 81%. Be prepared for a mix of weather!
In May in New Haven, the average temperature is 17°C (63°F), with maximums reaching 34°C (94°F) and minimums dropping as low as -1°C (30°F). This variation makes it an ideal time for travelers to pack both light clothing for warm days and warmer layers for chilly nights.
In New Haven in May, the total precipitation amount is 127 mm (5.0 in), occurring over the course of 14 days.
In New Haven in May humidity is 81%. With an average temperature of 17°C (63°F), this humidity feels like a warm blanket enveloping you, making travel slightly oppressive and calling for frequent breaks in air-conditioned spaces to recharge and enjoy your journey comfortably.
In New Haven in May, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For 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 | -2°C (29°F) | 74 mm (2.9 inches) | 85% | moderate |
| February Weather | -1°C (31°F) | 80 mm (3.2 inches) | 85% | moderate |
| March Weather | 5°C (41°F) | 102 mm (4.0 inches) | 86% | high |
| April Weather | 10°C (50°F) | 92 mm (3.6 inches) | 87% | very high |
| May Weather | 17°C (63°F) | 127 mm (5.0 inches) | 81% | very high |
| June Weather | 22°C (72°F) | 121 mm (4.8 inches) | 82% | very high |
| July Weather | 24°C (76°F) | 104 mm (4.1 inches) | 81% | very high |
| August Weather | 23°C (74°F) | 96 mm (3.8 inches) | 79% | very high |
| September Weather | 20°C (68°F) | 65 mm (2.5 inches) | 78% | very high |
| October Weather | 14°C (57°F) | 101 mm (4.0 inches) | 81% | high |
| November Weather | 5°C (41°F) | 82 mm (3.2 inches) | 89% | moderate |
| December Weather | 1°C (35°F) | 61 mm (2.4 inches) | 86% | low |