Click on a day for an hourly weather forecast
The temperatures in Monaghan in September are quite cold with temperatures between 8°C and 15°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Monaghan 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 Monaghan in September 2025.
If you’re planning to visit Monaghan in the near future, we highly recommend that you review the 14 day weather forecast for Monaghan before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 6° / 1° | 9 | 18 | 4 | 62 mm | Awful | Monaghan in January |
| February | 7° / 1° | 9 | 14 | 6 | 71 mm | Awful | Monaghan in February |
| March | 9° / 1° | 8 | 20 | 3 | 60 mm | Awful | Monaghan in March |
| April | 11° / 3° | 5 | 25 | 1 | 51 mm | Ok | Monaghan in April |
| May | 14° / 5° | 6 | 25 | 0 | 66 mm | Good | Monaghan in May |
| June | 16° / 8° | 7 | 24 | 0 | 78 mm | Ok | Monaghan in June |
| July | 18° / 10° | 6 | 25 | 0 | 81 mm | Good | Monaghan in July |
| August | 17° / 10° | 6 | 25 | 0 | 79 mm | Good | Monaghan in August |
| September | 15° / 8° | 5 | 25 | 0 | 56 mm | Good | Monaghan in September |
| October | 12° / 6° | 7 | 24 | 0 | 68 mm | Bad | Monaghan in October |
| November | 9° / 4° | 8 | 21 | 0 | 74 mm | Bad | Monaghan in November |
| December | 6° / 2° | 8 | 21 | 2 | 68 mm | Awful | Monaghan in December |