Last updated: June 24, 2025
In Saint Clair, United States, the average temperature in May is a pleasant 15°C (60°F). However, be prepared for a wide range of temperatures, with a minimum of 1°C (33°F) and a scorching maximum of 36°C (97°F). During this month, you can expect approximately 140 mm (5.5 in) of precipitation spread over 14 days, contributing to an average humidity of 74%. Whether you're packing light or preparing for showers, make sure to plan accordingly!
In May in Saint Clair, the average temperature is 15°C (60°F). Maximum temperatures can reach 36°C (97°F), while minimums can drop to as low as 1°C (33°F). Travelers should be prepared for a wide range of temperatures, ensuring they pack accordingly for both warm days and cool nights.
In Saint Clair in May, the precipitation amount is 140 mm (5.5 in) over the course of 14 days.
In Saint Clair in May humidity is 74%. With an average temperature of 15°C (60°F), this humidity feels like a warm embrace that can make outdoor activities feel slightly stifling, so travelers should be prepared to hydrate frequently and take breaks in the shade.
In Saint Clair 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 Saint Clair.
UV Risk Categories
Weather in Saint Clair varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Saint Clair, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -8°C (17°F) | 34 mm (1.3 inches) | 82% | moderate |
| February Weather | -9°C (17°F) | 41 mm (1.6 inches) | 84% | moderate |
| March Weather | 1°C (34°F) | 68 mm (2.7 inches) | 80% | moderate |
| April Weather | 7°C (45°F) | 91 mm (3.6 inches) | 81% | very high |
| May Weather | 15°C (60°F) | 140 mm (5.5 inches) | 74% | very high |
| June Weather | 22°C (72°F) | 118 mm (4.7 inches) | 80% | very high |
| July Weather | 23°C (74°F) | 103 mm (4.1 inches) | 80% | very high |
| August Weather | 21°C (71°F) | 119 mm (4.7 inches) | 77% | very high |
| September Weather | 18°C (65°F) | 137 mm (5.4 inches) | 75% | very high |
| October Weather | 9°C (49°F) | 93 mm (3.7 inches) | 80% | moderate |
| November Weather | 1°C (35°F) | 36 mm (1.4 inches) | 87% | moderate |
| December Weather | -4°C (25°F) | 44 mm (1.7 inches) | 83% | moderate |