Click on a day for an hourly weather forecast
The temperatures in Ontario in December are quite cold with temperatures between 9°C and 18°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Ontario during the month of December. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Ontario in December 2024.
If you’re planning to visit Ontario in the near future, we highly recommend that you review the 14 day weather forecast for Ontario before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 19° / 9° | 2 | 29 | 0 | 57 mm | Good | Ontario in January |
| February | 19° / 9° | 2 | 26 | 0 | 63 mm | Good | Ontario in February |
| March | 20° / 10° | 2 | 29 | 0 | 36 mm | Good | Ontario in March |
| April | 22° / 12° | 1 | 29 | 0 | 22 mm | Good | Ontario in April |
| May | 24° / 14° | 0 | 31 | 0 | 7 mm | Perfect | Ontario in May |
| June | 28° / 18° | 0 | 30 | 0 | 1 mm | Perfect | Ontario in June |
| July | 31° / 21° | 0 | 31 | 0 | 10 mm | Good | Ontario in July |
| August | 32° / 22° | 0 | 31 | 0 | 6 mm | Good | Ontario in August |
| September | 31° / 21° | 0 | 30 | 0 | 5 mm | Good | Ontario in September |
| October | 26° / 17° | 1 | 30 | 0 | 10 mm | Perfect | Ontario in October |
| November | 22° / 12° | 1 | 29 | 0 | 22 mm | Good | Ontario in November |
| December | 18° / 9° | 3 | 28 | 0 | 72 mm | Good | Ontario in December |