Click on a day for an hourly weather forecast
The temperatures in Leinster 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 Leinster 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 Leinster in September 2025.
If you’re planning to visit Leinster in the near future, we highly recommend that you review the 14 day weather forecast for Leinster before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 8° / 4° | 10 | 18 | 2 | 103 mm | Awful | Leinster in January |
| February | 8° / 4° | 8 | 18 | 2 | 92 mm | Awful | Leinster in February |
| March | 9° / 5° | 7 | 23 | 1 | 78 mm | Bad | Leinster in March |
| April | 10° / 6° | 7 | 22 | 1 | 72 mm | Bad | Leinster in April |
| May | 13° / 8° | 6 | 25 | 0 | 74 mm | Ok | Leinster in May |
| June | 15° / 11° | 6 | 24 | 0 | 98 mm | Good | Leinster in June |
| July | 17° / 12° | 7 | 24 | 0 | 97 mm | Ok | Leinster in July |
| August | 17° / 12° | 7 | 24 | 0 | 106 mm | Ok | Leinster in August |
| September | 16° / 11° | 7 | 23 | 0 | 89 mm | Ok | Leinster in September |
| October | 13° / 10° | 8 | 23 | 0 | 123 mm | Bad | Leinster in October |
| November | 10° / 7° | 9 | 21 | 0 | 124 mm | Bad | Leinster in November |
| December | 8° / 5° | 9 | 20 | 2 | 114 mm | Awful | Leinster in December |