Click on a day for an hourly weather forecast
The temperatures in Clonmel in September are usually low and can range between 11°C and 16°C.
You can expect about 3 to 8 days of rain in Clonmel 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 Clonmel in September 2025.
If you’re planning to visit Clonmel in the near future, we highly recommend that you review the 14 day weather forecast for Clonmel before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 8° / 4° | 8 | 21 | 2 | 82 mm | Awful | Clonmel in January |
| February | 9° / 4° | 6 | 20 | 2 | 66 mm | Bad | Clonmel in February |
| March | 10° / 4° | 5 | 25 | 1 | 53 mm | Ok | Clonmel in March |
| April | 11° / 5° | 5 | 25 | 0 | 54 mm | Ok | Clonmel in April |
| May | 13° / 8° | 4 | 27 | 0 | 59 mm | Ok | Clonmel in May |
| June | 16° / 10° | 4 | 26 | 0 | 70 mm | Good | Clonmel in June |
| July | 18° / 12° | 4 | 27 | 0 | 64 mm | Good | Clonmel in July |
| August | 18° / 12° | 6 | 25 | 0 | 83 mm | Good | Clonmel in August |
| September | 16° / 11° | 4 | 26 | 0 | 61 mm | Good | Clonmel in September |
| October | 14° / 9° | 7 | 24 | 0 | 101 mm | Ok | Clonmel in October |
| November | 10° / 6° | 7 | 22 | 0 | 102 mm | Bad | Clonmel in November |
| December | 9° / 5° | 7 | 22 | 1 | 93 mm | Bad | Clonmel in December |