Last updated: March 2, 2024
The weather in Ontario, United States, during August is characterized by an average temperature of 21°C (70°F). Highs can soar to 31°C (87°F), while lows may dip to 10°C (51°F). Typically, the humidity level in Ontario throughout August hovers around 69%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In August, Ontario averages 117 mm (4.6 inches) of rainfall, typically over the course of 12 rainy days. The month enjoys an average of 13 hours 53 minutes of daylight, with the sun shining for approximately 10 hours 36 minutes each day. Additionally, there is a 57% probability of sunny days during this period.
Precipitation
Rainy days
Sunshine hours
Chance of sun
In August, 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 | ||||||