Click on a day for an hourly weather forecast
The temperatures in Galway in September are usually low and can range between 10°C and 16°C.
You can expect about 3 to 8 days of rain in Galway 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 Galway in September 2025.
If you’re planning to visit Galway in the near future, we highly recommend that you review the 14 day weather forecast for Galway before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 8° / 4° | 11 | 19 | 1 | 139 mm | Bad | Galway in January |
| February | 8° / 4° | 11 | 16 | 2 | 131 mm | Awful | Galway in February |
| March | 10° / 4° | 9 | 20 | 1 | 104 mm | Bad | Galway in March |
| April | 12° / 5° | 6 | 24 | 0 | 81 mm | Ok | Galway in April |
| May | 14° / 7° | 8 | 23 | 0 | 106 mm | Ok | Galway in May |
| June | 17° / 9° | 7 | 23 | 0 | 109 mm | Ok | Galway in June |
| July | 18° / 11° | 9 | 22 | 0 | 122 mm | Ok | Galway in July |
| August | 17° / 11° | 8 | 23 | 0 | 130 mm | Ok | Galway in August |
| September | 16° / 10° | 7 | 23 | 0 | 106 mm | Ok | Galway in September |
| October | 13° / 8° | 9 | 22 | 0 | 122 mm | Bad | Galway in October |
| November | 10° / 6° | 11 | 19 | 0 | 149 mm | Bad | Galway in November |
| December | 8° / 4° | 11 | 19 | 1 | 150 mm | Bad | Galway in December |