Last updated: June 24, 2025
In May, the average temperature in Romeoville, United States hovers around 16°C (61°F), with a diverse range of weather. Expect minimums dipping to -2°C (29°F) and maximums soaring to 34°C (94°F). The month brings 156 mm (6.1 in) of precipitation over about 15 days, contributing to an average humidity level of 79%. Be prepared for a mix of sunny days and showers!
In May in Romeoville, the average temperature is 16°C (61°F). Maximum temperatures can reach up to 34°C (94°F), while minimums can drop as low as -2°C (29°F). This range makes Romeoville an ideal destination for travelers seeking both warm and cool experiences.
In Romeoville in May, the total precipitation amount is 156 mm (6.1 in) distributed over 15 days.
In Romeoville in May humidity is 79%. With an average temperature of 16°C (61°F), this humidity feels like a warm, moist embrace, making travel a bit more challenging as the air tends to weigh heavily, but it also offers a refreshing atmosphere perfect for exploring local sights and enjoying nature.
In Romeoville 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 Romeoville.
UV Risk Categories
Weather in Romeoville varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Romeoville, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -3°C (26°F) | 61 mm (2.4 inches) | 82% | moderate |
| February Weather | -2°C (28°F) | 63 mm (2.5 inches) | 83% | moderate |
| March Weather | 4°C (40°F) | 89 mm (3.5 inches) | 84% | high |
| April Weather | 9°C (49°F) | 120 mm (4.7 inches) | 85% | very high |
| May Weather | 16°C (61°F) | 156 mm (6.1 inches) | 79% | very high |
| June Weather | 22°C (72°F) | 151 mm (6.0 inches) | 82% | very high |
| July Weather | 24°C (76°F) | 116 mm (4.6 inches) | 80% | very high |
| August Weather | 23°C (73°F) | 91 mm (3.6 inches) | 81% | very high |
| September Weather | 20°C (68°F) | 85 mm (3.4 inches) | 80% | very high |
| October Weather | 12°C (55°F) | 131 mm (5.2 inches) | 82% | high |
| November Weather | 4°C (39°F) | 57 mm (2.3 inches) | 88% | moderate |
| December Weather | 1°C (33°F) | 54 mm (2.1 inches) | 84% | low |