Last updated: June 24, 2025
The average temperature in Mount Vernon, United States during May hovers around 13°C (55°F). Expect a range with minimums dipping to 1°C (34°F) and maximums soaring up to 32°C (89°F). Be prepared for some rain, as the area experiences an average precipitation of 83 mm (3.3 in) over 10 days. Don't forget to account for the average humidity level of 78%, which can make the air feel quite different!
In May in Mount Vernon, the average temperature is 13°C (55°F). Maximum can reach 32°C (89°F) and minimum can be as low as 1°C (34°F). This variability makes Mount Vernon a destination where travelers should prepare for both warm and cool weather conditions.
In Mount Vernon in May, the total precipitation amount is 83 mm (3.3 in) over a span of 10 days.
In Mount Vernon in May, humidity is 78%. With an average temperature of 13°C (55°F), this humidity feels like a damp blanket enveloping you, making outdoor activities feel steamy and your clothes cling uncomfortably, often leaving you longing for a cool breeze or an air-conditioned escape while exploring.
In Mount Vernon 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 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 | -6°C (21°F) | 83 mm (3.2 inches) | 91% | low |
| February Weather | -5°C (23°F) | 84 mm (3.3 inches) | 89% | moderate |
| March Weather | -1°C (31°F) | 72 mm (2.9 inches) | 85% | moderate |
| April Weather | 6°C (43°F) | 121 mm (4.8 inches) | 84% | very high |
| May Weather | 13°C (55°F) | 83 mm (3.3 inches) | 78% | very high |
| June Weather | 18°C (65°F) | 74 mm (2.9 inches) | 72% | very high |
| July Weather | 21°C (70°F) | 121 mm (4.7 inches) | 75% | very high |
| August Weather | 21°C (69°F) | 82 mm (3.2 inches) | 74% | very high |
| September Weather | 17°C (62°F) | 70 mm (2.7 inches) | 77% | high |
| October Weather | 10°C (50°F) | 127 mm (5.0 inches) | 85% | moderate |
| November Weather | 2°C (36°F) | 110 mm (4.3 inches) | 86% | moderate |
| December Weather | -4°C (26°F) | 113 mm (4.4 inches) | 85% | low |