Last updated: June 24, 2025
In May, the average temperature in Mount Vernon, United States hovers around 20°C (69°F), offering a comfortable climate for visitors. However, be prepared for a range of temperatures, with lows dipping to 4°C (39°F) and highs soaring to 34°C (94°F). Expect 165 mm (6.5 in) of precipitation spread over 13 days, contributing to an average humidity level of 80%. Whether you're exploring the outdoors or enjoying local attractions, pack accordingly!
In May in Mount Vernon, the average temperature is 20°C (69°F). Maximum temperatures can reach 34°C (94°F), while the minimum can drop to as low as 4°C (39°F). This range makes it an ideal time to explore outdoor activities while being prepared for some cooler evenings.
In Mount Vernon in May, the precipitation amount is 165 mm (6.5 in) spread over 13 days.
In Mount Vernon in May, humidity is 80%. With an average temperature of 20°C (69°F), this humidity feels like a warm blanket enveloping you, making every step slightly more challenging as you navigate the air that clings to your skin, often leaving you longing for a cool breeze while exploring the sights.
In Mount Vernon in May, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Mount Vernon.
UV Risk Categories
Weather in Mount Vernon varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Mount Vernon, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 1°C (34°F) | 93 mm (3.7 inches) | 84% | moderate |
| February Weather | 3°C (38°F) | 107 mm (4.2 inches) | 82% | moderate |
| March Weather | 9°C (48°F) | 143 mm (5.6 inches) | 84% | high |
| April Weather | 14°C (57°F) | 131 mm (5.2 inches) | 83% | very high |
| May Weather | 20°C (69°F) | 165 mm (6.5 inches) | 80% | extreme |
| June Weather | 25°C (77°F) | 100 mm (3.9 inches) | 83% | extreme |
| July Weather | 27°C (80°F) | 94 mm (3.7 inches) | 82% | very high |
| August Weather | 25°C (77°F) | 86 mm (3.4 inches) | 82% | very high |
| September Weather | 23°C (73°F) | 64 mm (2.5 inches) | 79% | very high |
| October Weather | 16°C (61°F) | 121 mm (4.8 inches) | 79% | high |
| November Weather | 7°C (45°F) | 91 mm (3.6 inches) | 88% | moderate |
| December Weather | 5°C (41°F) | 88 mm (3.4 inches) | 87% | moderate |