Last updated: June 18, 2025
The average temperature in Rock Island, Canada during May is 12°C (53°F). Visitors can expect a wide range of temperatures, with a minimum of -2°C (29°F) and a maximum of 32°C (89°F). Expect precipitation of 103 mm (4.1 in) spread over 13 days, alongside an average humidity level of 78%. Be prepared for a mix of conditions that define the character of this month!
In May in Rock Island, the average temperature is 12°C (53°F). The maximum can reach 32°C (89°F), and the minimum can be as low as -2°C (29°F). This variation makes Rock Island an intriguing destination for travelers, offering both warm days and the possibility of chilly evenings.
In Rock Island in May, the precipitation amount is 103 mm (4.1 in) spread over a duration of 13 days.
In Rock Island in May, humidity is 78%. With an average temperature of 12°C (53°F), this humidity feels like a damp chill that lingers in the air, making it essential to wear layers while exploring the sights, as the cool moisture can seep into your bones and leave you feeling a bit uncomfortable if not properly dressed for the weather.
In Rock Island 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 Rock Island.
UV Risk Categories
Weather in Rock Island varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Rock Island, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -8°C (17°F) | 88 mm (3.5 inches) | 91% | low |
| February Weather | -7°C (20°F) | 82 mm (3.2 inches) | 89% | moderate |
| March Weather | -3°C (27°F) | 80 mm (3.1 inches) | 85% | moderate |
| April Weather | 5°C (40°F) | 112 mm (4.4 inches) | 84% | high |
| May Weather | 12°C (53°F) | 103 mm (4.1 inches) | 78% | very high |
| June Weather | 17°C (62°F) | 116 mm (4.5 inches) | 72% | very high |
| July Weather | 20°C (67°F) | 119 mm (4.7 inches) | 75% | very high |
| August Weather | 19°C (66°F) | 104 mm (4.1 inches) | 74% | very high |
| September Weather | 14°C (58°F) | 83 mm (3.3 inches) | 77% | high |
| October Weather | 8°C (47°F) | 149 mm (5.9 inches) | 85% | moderate |
| November Weather | 0°C (33°F) | 114 mm (4.5 inches) | 86% | moderate |
| December Weather | -5°C (23°F) | 84 mm (3.3 inches) | 85% | low |