Average humidity in Thornhill
The mean monthly relative humidity over the year in Thornhill (Ontario), Canada.
- On average, September is the most humid month, at 87.0%.
- On average, May is the least humid month, at 76.0%.
- The average annual percentage of humidity is 81%.
Forecast for Thornhill
partly cloudy and no rain
partly cloudy and chance of slight rain
clear and no rain