Click on a day for an hourly weather forecast
The temperatures in Holyhead in September are usually low and can range between 13°C and 15°C.
You can expect rain for roughly half of the month of September in Holyhead. 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 Holyhead in September 2025.
If you’re planning to visit Holyhead in the near future, we highly recommend that you review the 14 day weather forecast for Holyhead before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 8° / 6° | 12 | 18 | 2 | 150 mm | Awful | Holyhead in January |
| February | 8° / 6° | 11 | 16 | 2 | 133 mm | Awful | Holyhead in February |
| March | 9° / 6° | 8 | 22 | 1 | 98 mm | Bad | Holyhead in March |
| April | 10° / 7° | 7 | 23 | 0 | 74 mm | Bad | Holyhead in April |
| May | 12° / 10° | 8 | 23 | 0 | 96 mm | Bad | Holyhead in May |
| June | 15° / 12° | 7 | 23 | 0 | 101 mm | Ok | Holyhead in June |
| July | 16° / 14° | 8 | 24 | 0 | 121 mm | Ok | Holyhead in July |
| August | 16° / 14° | 9 | 22 | 0 | 158 mm | Ok | Holyhead in August |
| September | 15° / 13° | 8 | 22 | 0 | 142 mm | Ok | Holyhead in September |
| October | 14° / 12° | 11 | 20 | 0 | 181 mm | Ok | Holyhead in October |
| November | 11° / 9° | 12 | 18 | 0 | 196 mm | Bad | Holyhead in November |
| December | 9° / 7° | 12 | 18 | 1 | 191 mm | Bad | Holyhead in December |