Last updated: March 2, 2024
The weather in Ontario, United States, during May is characterized by an average temperature of 15°C (59°F). Highs can soar to 31°C (88°F), while lows may dip to 1°C (35°F). Typically, the humidity level in Ontario throughout May hovers around 75%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In May, Ontario averages 141 mm (5.5 inches) of rainfall, typically over the course of 15 rainy days. The month enjoys an average of 14 hours 45 minutes of daylight, with the sun shining for approximately 8 hours 42 minutes each day. Additionally, there is a 34% probability of sunny days during this period.
Precipitation
Rainy days
Sunshine hours
Chance of sun
In May, the UV Index in Ontario reaches a maximum of 9, indicating a level of VeryHigh exposure. The most intense UV radiation typically occurs between 13:00 and 15:00, during which unprotected skin may burn in as little as 15 minutes.
| 07:00 | 08:00 | 09:00 | 10:00 | 11:00 | 12:00 | 13:00 | 14:00 | 15:00 | 16:00 | 17:00 | 18:00 | 19:00 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UVI | 1 | 2 | 3 | 5 | 7 | 8 | 9 | 8 | 7 | 5 | 3 | 2 | 1 |
| Exposure | Low | Moderate | High | VeryHigh | High | Moderate | Low | ||||||
| Time to burn | 45 min | 30 min | 25 min | 15 min | 25 min | 30 min | 45 min | ||||||