Last updated: June 24, 2025
In May, the average temperature in Monticello, United States hovers around 16°C (61°F). However, be prepared for a range—thermometers can dip as low as -1°C (31°F) or soar to a warm 33°C (92°F). With an average humidity of 75% and approximately 158 mm (6.2 in) of precipitation spread over 15 days, don’t forget your umbrella and a light jacket for those cooler moments!
In May, in Monticello, the average temperature is 16°C (61°F). Maximums can reach 33°C (92°F) and minimums can drop as low as -1°C (31°F). Travelers should prepare for a wide range of weather conditions, from warm days to chilly nights.
In Monticello in May, the precipitation amount is 158 mm (6.2 in) over the course of 15 days.
In Monticello in May humidity is 75%. With an average temperature of 16°C (61°F), this humidity feels like a warm, muggy embrace, making traveling somewhat uncomfortable as you may find yourself constantly adjusting your clothing and seeking shade to escape the sticky air.
In Monticello 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 Monticello.
UV Risk Categories
Weather in Monticello varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Monticello, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -6°C (21°F) | 48 mm (1.9 inches) | 84% | moderate |
| February Weather | -5°C (22°F) | 59 mm (2.3 inches) | 85% | moderate |
| March Weather | 3°C (37°F) | 67 mm (2.6 inches) | 84% | moderate |
| April Weather | 8°C (47°F) | 80 mm (3.1 inches) | 83% | very high |
| May Weather | 16°C (61°F) | 158 mm (6.2 inches) | 75% | very high |
| June Weather | 22°C (72°F) | 122 mm (4.8 inches) | 79% | extreme |
| July Weather | 24°C (75°F) | 87 mm (3.4 inches) | 75% | very high |
| August Weather | 22°C (72°F) | 84 mm (3.3 inches) | 69% | very high |
| September Weather | 19°C (66°F) | 124 mm (4.9 inches) | 74% | very high |
| October Weather | 11°C (52°F) | 131 mm (5.2 inches) | 79% | moderate |
| November Weather | 3°C (37°F) | 48 mm (1.9 inches) | 88% | moderate |
| December Weather | -1°C (30°F) | 43 mm (1.7 inches) | 82% | moderate |