Last updated: June 18, 2025
In Oakville, Canada, the average temperature for May is a mild 12°C (54°F). However, you can expect temperatures to vary, with lows dipping to -1°C (30°F) and highs reaching up to 29°C (84°F). Precipitation is fairly frequent, with an average of 98 mm (3.9 in) falling over 12 days. Additionally, the average humidity hovers around 82%, contributing to a cozy, if sometimes damp, atmosphere.
In May in Oakville, the average temperature is 12°C (54°F). Maximum temperatures can reach 29°C (84°F), while minimum temperatures can drop as low as -1°C (30°F). This variation makes it ideal for travelers to pack a range of clothing to accommodate both warm days and chilly nights.
In Oakville in May, the precipitation amount is 98 mm (3.9 in) over the course of 12 days.
In Oakville in May humidity is 82%. With an average temperature of 12°C (54°F), this humidity feels like a heavy blanket wrapping around you, making every step feel sluggish and sweat-inducing, which can be quite uncomfortable for traveling.
In Oakville 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 Oakville.
UV Risk Categories
Weather in Oakville varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Oakville, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -3°C (26°F) | 73 mm (2.9 inches) | 91% | low |
| February Weather | -3°C (27°F) | 80 mm (3.2 inches) | 91% | moderate |
| March Weather | 1°C (34°F) | 64 mm (2.5 inches) | 88% | moderate |
| April Weather | 6°C (43°F) | 110 mm (4.3 inches) | 88% | very high |
| May Weather | 12°C (54°F) | 98 mm (3.9 inches) | 82% | very high |
| June Weather | 18°C (65°F) | 88 mm (3.5 inches) | 79% | very high |
| July Weather | 22°C (72°F) | 75 mm (2.9 inches) | 77% | very high |
| August Weather | 22°C (71°F) | 77 mm (3.0 inches) | 72% | very high |
| September Weather | 18°C (64°F) | 63 mm (2.5 inches) | 76% | high |
| October Weather | 12°C (53°F) | 108 mm (4.3 inches) | 83% | moderate |
| November Weather | 4°C (39°F) | 79 mm (3.1 inches) | 88% | moderate |
| December Weather | 0°C (32°F) | 78 mm (3.1 inches) | 87% | low |