Last updated: June 18, 2025
In Saint-Thomas, Canada, the average temperature in May hovers around 13°C (56°F). Conditions can vary widely, with minimums dipping to -2°C (29°F) and maximums soaring to 35°C (96°F). Expect 96 mm (3.8 in) of precipitation spread over 11 days, contributing to an average humidity level of 80%. Plan your visit accordingly to make the most of the diverse weather!
In May in Saint-Thomas, the average temperature is 13°C (56°F), with maximums reaching 35°C (96°F) and minimums dropping as low as -2°C (29°F). Travelers should be prepared for a wide range of temperatures during this time.
In Saint-Thomas in May, the precipitation amount is 96 mm (3.8 in) spread over 11 days, resulting in a significant accumulation of rainfall.
In Saint-Thomas in May humidity is 80%. With average temperature 13°C (56°F) this humidity feels like a damp chill that seeps into your bones, making outdoor exploration more challenging and necessitating layered clothing for comfort.
In Saint-Thomas 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-Thomas.
UV Risk Categories
Weather in Saint-Thomas varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Saint-Thomas, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -9°C (15°F) | 83 mm (3.3 inches) | 93% | low |
| February Weather | -8°C (18°F) | 82 mm (3.2 inches) | 92% | moderate |
| March Weather | -3°C (27°F) | 85 mm (3.4 inches) | 86% | moderate |
| April Weather | 5°C (42°F) | 121 mm (4.8 inches) | 85% | high |
| May Weather | 13°C (56°F) | 96 mm (3.8 inches) | 80% | very high |
| June Weather | 19°C (66°F) | 95 mm (3.7 inches) | 74% | very high |
| July Weather | 22°C (71°F) | 89 mm (3.5 inches) | 76% | very high |
| August Weather | 20°C (69°F) | 104 mm (4.1 inches) | 75% | very high |
| September Weather | 16°C (60°F) | 64 mm (2.5 inches) | 78% | high |
| October Weather | 9°C (49°F) | 124 mm (4.9 inches) | 86% | moderate |
| November Weather | 0°C (33°F) | 114 mm (4.5 inches) | 88% | moderate |
| December Weather | -6°C (21°F) | 90 mm (3.5 inches) | 89% | low |