Last updated: June 24, 2025
In January, the average temperature in Ontario, United States hovers around 0°C (33°F), with lows dipping to a frigid -27°C (-17°F) and highs reaching a mild 15°C (59°F). Visitors can expect 42 mm (1.7 in) of precipitation over approximately 8 days, contributing to a notably high average humidity of 88%. Be prepared for chilly and damp conditions during your stay!
In January in Ontario, the average temperature is 0°C (33°F). Maximums can reach 15°C (59°F), while minimums can drop as low as -27°C (-17°F). It's advisable to pack warm layers and be prepared for chilly conditions during your travels.
In Ontario in January, the precipitation amount is 42 mm (1.7 in) over the course of 8 days.
In Ontario in January, humidity is 88%. With an average temperature of 0°C (33°F), this humidity feels like a damp chill that seeps into your bones, making travel uncomfortable and requiring extra layers to stay warm and dry.
In Ontario in January, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Ontario, you can check the information here.
UV Risk Categories
Weather in Ontario varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Ontario, focusing on differences in temperature, rainfall, humidity, and UV levels.
Temperature | Precipitation | Humidity | UV | |
---|---|---|---|---|
January Weather | 0°C (33°F) | 42 mm (1.7 inches) | 88% | moderate |
February Weather | 2°C (36°F) | 46 mm (1.8 inches) | 89% | moderate |
March Weather | 8°C (47°F) | 32 mm (1.3 inches) | 85% | high |
April Weather | 12°C (55°F) | 23 mm (0.9 inches) | 79% | high |
May Weather | 17°C (64°F) | 28 mm (1.1 inches) | 71% | very high |
June Weather | 23°C (73°F) | 16 mm (0.6 inches) | 71% | extreme |
July Weather | 29°C (84°F) | 1 mm (0.0 inches) | 66% | very high |
August Weather | 27°C (82°F) | 5 mm (0.2 inches) | 50% | very high |
September Weather | 21°C (70°F) | 10 mm (0.4 inches) | 48% | very high |
October Weather | 12°C (55°F) | 16 mm (0.6 inches) | 65% | moderate |
November Weather | 6°C (43°F) | 27 mm (1.1 inches) | 84% | moderate |
December Weather | 1°C (35°F) | 29 mm (1.1 inches) | 87% | low |