Click on a day for an hourly weather forecast
The temperatures in Aberystwyth 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 Aberystwyth 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 Aberystwyth in September 2025.
If you’re planning to visit Aberystwyth in the near future, we highly recommend that you review the 14 day weather forecast for Aberystwyth before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 6° / 2° | 13 | 13 | 5 | 177 mm | Awful | Aberystwyth in January |
| February | 7° / 3° | 11 | 13 | 5 | 140 mm | Awful | Aberystwyth in February |
| March | 9° / 3° | 9 | 20 | 3 | 107 mm | Awful | Aberystwyth in March |
| April | 11° / 4° | 6 | 23 | 1 | 79 mm | Ok | Aberystwyth in April |
| May | 14° / 7° | 8 | 23 | 0 | 102 mm | Ok | Aberystwyth in May |
| June | 16° / 9° | 8 | 22 | 0 | 119 mm | Ok | Aberystwyth in June |
| July | 18° / 11° | 8 | 23 | 0 | 127 mm | Ok | Aberystwyth in July |
| August | 17° / 12° | 8 | 23 | 0 | 133 mm | Ok | Aberystwyth in August |
| September | 16° / 10° | 7 | 23 | 0 | 117 mm | Ok | Aberystwyth in September |
| October | 13° / 8° | 9 | 21 | 0 | 152 mm | Bad | Aberystwyth in October |
| November | 9° / 6° | 11 | 19 | 1 | 171 mm | Bad | Aberystwyth in November |
| December | 7° / 4° | 13 | 15 | 3 | 194 mm | Awful | Aberystwyth in December |