Click on a day for an hourly weather forecast
The temperatures in Mason in September are comfortable with low of 15°C and and high up to 25°C.
You can expect about 3 to 8 days of rain in Mason during the month of September. 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 Mason in September 2025.
If you’re planning to visit Mason in the near future, we highly recommend that you review the 14 day weather forecast for Mason before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 2° / -5° | 7 | 12 | 12 | 77 mm | Awful | Mason in January |
| February | 4° / -4° | 6 | 11 | 11 | 100 mm | Awful | Mason in February |
| March | 11° / 2° | 8 | 17 | 5 | 107 mm | Awful | Mason in March |
| April | 16° / 7° | 8 | 21 | 2 | 136 mm | Bad | Mason in April |
| May | 23° / 13° | 9 | 22 | 0 | 152 mm | Good | Mason in May |
| June | 27° / 17° | 6 | 24 | 0 | 131 mm | Perfect | Mason in June |
| July | 29° / 19° | 8 | 23 | 0 | 127 mm | Ok | Mason in July |
| August | 28° / 18° | 6 | 25 | 0 | 101 mm | Perfect | Mason in August |
| September | 25° / 15° | 5 | 25 | 0 | 88 mm | Perfect | Mason in September |
| October | 18° / 9° | 5 | 26 | 0 | 84 mm | Good | Mason in October |
| November | 11° / 3° | 5 | 23 | 3 | 88 mm | Bad | Mason in November |
| December | 5° / -1° | 7 | 15 | 10 | 96 mm | Awful | Mason in December |