Click on a day for an hourly weather forecast
The temperatures in Haverfordwest in September are usually low and can range between 13°C and 16°C.
You can expect about 3 to 8 days of rain in Haverfordwest 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 Haverfordwest in September 2025.
If you’re planning to visit Haverfordwest in the near future, we highly recommend that you review the 14 day weather forecast for Haverfordwest before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 9° / 6° | 10 | 21 | 0 | 102 mm | Bad | Haverfordwest in January |
| February | 8° / 6° | 8 | 21 | 0 | 76 mm | Bad | Haverfordwest in February |
| March | 9° / 6° | 8 | 23 | 0 | 68 mm | Bad | Haverfordwest in March |
| April | 11° / 7° | 6 | 24 | 0 | 52 mm | Ok | Haverfordwest in April |
| May | 13° / 9° | 7 | 24 | 0 | 61 mm | Bad | Haverfordwest in May |
| June | 16° / 12° | 6 | 24 | 0 | 71 mm | Good | Haverfordwest in June |
| July | 18° / 14° | 7 | 24 | 0 | 70 mm | Ok | Haverfordwest in July |
| August | 18° / 15° | 9 | 23 | 0 | 91 mm | Ok | Haverfordwest in August |
| September | 16° / 13° | 7 | 23 | 0 | 89 mm | Ok | Haverfordwest in September |
| October | 14° / 12° | 10 | 21 | 0 | 122 mm | Ok | Haverfordwest in October |
| November | 11° / 9° | 13 | 17 | 0 | 127 mm | Bad | Haverfordwest in November |
| December | 10° / 7° | 12 | 19 | 0 | 128 mm | Bad | Haverfordwest in December |