Click on a day for an hourly weather forecast
The temperatures in Sligo in September are usually low and can range between 10°C and 15°C.
You can expect rain for roughly half of the month of September in Sligo. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in Sligo in September 2025.
If you’re planning to visit Sligo in the near future, we highly recommend that you review the 14 day weather forecast for Sligo before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 7° / 3° | 11 | 18 | 3 | 133 mm | Awful | Sligo in January |
| February | 8° / 3° | 10 | 15 | 3 | 127 mm | Awful | Sligo in February |
| March | 9° / 4° | 9 | 20 | 2 | 95 mm | Awful | Sligo in March |
| April | 11° / 5° | 6 | 24 | 0 | 68 mm | Ok | Sligo in April |
| May | 13° / 7° | 8 | 23 | 0 | 103 mm | Bad | Sligo in May |
| June | 16° / 10° | 8 | 22 | 0 | 111 mm | Ok | Sligo in June |
| July | 17° / 11° | 9 | 22 | 0 | 136 mm | Ok | Sligo in July |
| August | 16° / 11° | 9 | 22 | 0 | 136 mm | Ok | Sligo in August |
| September | 15° / 10° | 8 | 22 | 0 | 109 mm | Ok | Sligo in September |
| October | 13° / 8° | 9 | 22 | 0 | 130 mm | Bad | Sligo in October |
| November | 10° / 6° | 11 | 19 | 0 | 141 mm | Bad | Sligo in November |
| December | 8° / 4° | 11 | 19 | 1 | 139 mm | Bad | Sligo in December |