Wales in september: average Weather, Temperature and Climate, Where to go?
Weather in Wales in september 2025
Below, you have access to the weather forecast for september for most popular cities in Wales. These datas are statistics for the month of september from weather reports for many years. The percentage indicates the probability of having the weather mentioned.
Average weather in september in Cardiff
good weather
Weather at 6am
54°F
Partly Cloudy
27% of time
23%
22%
18%
Weather at 12pm
65°F
Partly Cloudy
35% of time
31%
24%
10%
Weather at 6pm
61°F
Clear/Sunny
36% of time
28%
22%
12%
Weather at 3am
56°F
25%
24%
18%
16%
Where to go in Wales in september?
Where to go in Wales in september: destination map
perfect weather
good
tolerable
bad
very bad
Where should you go in Wales in september when it comes to the weather?
Remember:
The climate in Wales in september ranges from good to tolerable depending on the region and city.
Although it is not perfect the weather in Wales that month is pretty good in Cardiff, Pembrokeshire and Swansea. I allows to savor sightseeing in these places. And even why not take a little time to relax under the sun!
If you do not go lazing in the sun, but, for example for cultural tours or hiking, the cities of Snowdonia National Park, Brecon Beacons (National Park), Holyhead and Conwy have a decent enough weather for it in september.
Climate in Wales in september
Climate in Cardiff in september
In the month of september, maximum temperature is 65°F and minimum temperature is 54°F (for an average temperature of 59°F). The climate is relatively cold there in this month, but it is liveable when dressing cosy. With about 1.8in over 3 days,
it rains very little throughout your stay.
With a good weather, september is a good month to go in Cardiff in Wales.
| September | |||
| Average temperature | 59°F | ||
| Highest temperature | 65°F | ||
| Lowest temperature | 54°F | ||
| Sea temperature | 62°F | ||
| Rainfall | 1.8in | ||
| Number of days with rainfall | 3 day(s) (9%) | ||
| Humidity | 90% | ||
| Daily sunshine hours | 11 | ||
| Cloud cover | 48% | ||
| Length of day | 12:39 | ||
| Our opinion at whereandwhen.net | good |
Climate in Brecon Beacons (National Park) in september
In september, maximum temperature is 61°F and minimum temperature is 50°F (for an average temperature of 56°F). The climate is quite cold here in this month, but it is bearable by dressing hot. With 3.5in over 5 days, rainfall can happen throughout your vacations. But this is moderate and it will not be continuous.
With a correct weather, september is okay (but not good month) for traveling in this locality.
| September | |||
| Average temperature | 56°F | ||
| Highest temperature | 61°F | ||
| Lowest temperature | 50°F | ||
| Rainfall | 3.5in | ||
| Number of days with rainfall | 5 day(s) (16%) | ||
| Humidity | 96% | ||
| Daily sunshine hours | 10 | ||
| Cloud cover | 61% | ||
| Length of day | 12:39 | ||
| Our opinion at whereandwhen.net | tolerable |
Climate in Conwy in september
In the month of september, maximum temperature is 61°F and minimum temperature is 54°F (for an average temperature of 58°F). The climate is quite cool in this location in september, but it is endurable by dressing cosy. With 4.4in over 8 days, you risk getting wet slightly during your trip. But this is reasonably and it is only of temporary showers.
With proper weather, september is okay (but not good time) for traveling in that area.
| September | |||
| Average temperature | 58°F | ||
| Highest temperature | 61°F | ||
| Lowest temperature | 54°F | ||
| Sea temperature | 61°F | ||
| Rainfall | 4.4in | ||
| Number of days with rainfall | 8 day(s) (25%) | ||
| Humidity | 89% | ||
| Daily sunshine hours | 11 | ||
| Cloud cover | 53% | ||
| Length of day | 12:41 | ||
| Our opinion at whereandwhen.net | good |
Climate in Holyhead in september
In the month of september, the mean temperature in Holyhead is 59°F (maximum temperature is 61°F and minimum temperature is 58°F). The climate is fairly cool in this location in september, but it is liveable when dressing cosy. With 5.6in over 9 days, rain may occur throughout your trip. But this is pretty reasonably and it is only of temporary showers.
With a correct climate, the month of september is okay (but not good time) for traveling in this city in Wales.
| September | |||
| Average temperature | 59°F | ||
| Highest temperature | 61°F | ||
| Lowest temperature | 58°F | ||
| Sea temperature | 60°F | ||
| Rainfall | 5.6in | ||
| Number of days with rainfall | 9 day(s) (29%) | ||
| Humidity | 86% | ||
| Daily sunshine hours | 11 | ||
| Cloud cover | 52% | ||
| Length of day | 12:41 | ||
| Our opinion at whereandwhen.net | good |
Climate in Pembrokeshire in september
In the month of september, maximum temperature is 63°F and minimum temperature is 59°F (for an average temperature of 61°F). The climate is relatively cold in this city in september, but it is endurable when dressing warm. With 4.8in over 8 days, rain may occur during your vacations. But this is pretty reasonably and you will not be too bothered by it.
With good weather conditions, the month of september is an advisable month to go in this locality in Wales.
| September | |||
| Average temperature | 61°F | ||
| Highest temperature | 63°F | ||
| Lowest temperature | 59°F | ||
| Sea temperature | 62°F | ||
| Rainfall | 4.8in | ||
| Number of days with rainfall | 8 day(s) (25%) | ||
| Humidity | 86% | ||
| Daily sunshine hours | 11 | ||
| Cloud cover | 48% | ||
| Length of day | 12:39 | ||
| Our opinion at whereandwhen.net | good |
All cities in Wales in september
| Cardiff in september | good weather |
| Brecon Beacons (National Park) in september | tolerable weather |
| Conwy in september | good weather |
| Holyhead in september | good weather |
| Pembrokeshire in september | good weather |
| Snowdonia National Park in september | tolerable weather |
| Swansea in september | good weather |
| Aberystwyth in september | good weather |
| Amlwch in september | good weather |
| Barmouth in september | tolerable weather |
| Barry in september | good weather |
| Buckley in september | good weather |
| Carmarthen in september | good weather |
| Fishguard in september | good weather |
| Haverfordwest in september | good weather |
| Llandrindod Wells in september | tolerable weather |
| Llandudno in september | good weather |
| Llanelli in september | good weather |
| Merthyr Tydfil in september | good weather |
| Newtown in september | tolerable weather |
| Porthcawl in september | good weather |
Weather data for Wales in september:
Weather data for Wales in september is derived from an average of the weather forecast since 2009 in Wales. There is a margin of error and these forecasts are to be considered as general information only. The weather in Wales can vary slightly from year to year, but these predictions should limit surprises. So you can pack your bags and check when is the best time to go to Wales.