Last updated: March 2, 2024
The weather in Ontario, United States, during May is characterized by an average temperature of 17°C (62°F). Highs can soar to 31°C (87°F), while lows may dip to 2°C (36°F). Typically, the humidity level in Ontario throughout May hovers around 81%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In May, Ontario averages 126 mm (5.0 inches) of rainfall, typically over the course of 15 rainy days. The month enjoys an average of 14 hours 27 minutes of daylight, with the sun shining for approximately 8 hours 33 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 10, 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 | 1 | 3 | 5 | 7 | 9 | 10 | 10 | 9 | 6 | 4 | 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 | ||||||