Carmarthen in september: average Weather, Temperature and Climate
Weather in Carmarthen in september 2025
The weather in Carmarthen in september comes from statistical datas on the past years. You can view the weather statistics for the whole month, but also navigating through the tabs for the beginning, the middle and the end of the month.
Average weather throughout september
good weather
Weather at 6am
54°F
Partly Cloudy
25% of time
22%
19%
18%
Weather at 12pm
63°F
Moderate rain at times
24% of time
24%
24%
21%
Weather at 6pm
59°F
Clear/Sunny
28% of time
27%
22%
16%
Weather at 3am
56°F
26%
24%
21%
16%
Evolution of daily average temperature and precipitation in Carmarthen in september
These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in Carmarthen in september.
The climate of Carmarthen in september is good
The weather in september in Carmarthen is wet (with 3.9in of precipitation over 7 days). This is better than the previous month since in august it receives an average of 4.2in of rainfall over 7 days.
The climate is relatively fresh in this city september, but it is bearable when dressing hot. Temperatures are up to 63°F. The minimum is 54°F. Thus, the mean temperature average on this month of september in Carmarthen is 59°F. These temperatures are far removed from those records observed in Carmarthen in september with a maximum record of 79°F in 2021 and a minimum record of 43°F in 2010. You can expect to have about 10 days with temperatures up to 65°F, or 33% of the month.
Day length in Carmarthen in september is 12:39. Sunrise is at 05:52 and sunset is at 18:31.
With a correct weather, this month is okay (but not the best) to go there in Wales.
Seasonal average climate and temperature of Carmarthen in september
Check below seasonal norms These statistics are generated from the weather statements of the last years of september.
| September | |||||
| Outside temperature | |||||
| Average temperature | 59°F | ||||
| Highest temperature | 63°F | ||||
| Lowest temperature | 54°F | ||||
| Highest record temperature | 79°F (2021) | ||||
| Lowest record temperature | 43°F (2010) | ||||
| Number of days at +65°F | 10 day(s) (33%) | ||||
| Wind | |||||
| Wind speed | 21km/h | ||||
| Wind temperature | 52°F | ||||
| Precipitation (rainfall) | |||||
| Rainfall | 3.9in | ||||
| Number of days with rainfall | 7 day(s) (22%) | ||||
| Record daily rainfall | 2.1in (2018) | ||||
| Other climate data | |||||
| Humidity | 91% | ||||
| Visibility | 8.95km | ||||
| Cloud cover | 51% | ||||
| UV index | 4 | ||||
| Daily sunshine hours | 11 | ||||
| Sunrise and sunset | |||||
| Time of sunrise | 05:52 | ||||
| Time of sunset | 18:31 | ||||
| Length of day | 12:39 | ||||
| Our opinion about the weather in september | |||||
| Our opinion at whereandwhen.net | good | ||||
How was the weather last september?
Here is the day by day recorded weather in Carmarthen in september 2024:
56°F to 68°F
58°F to 63°F
56°F to 63°F
50°F to 59°F
52°F to 61°F
61°F to 70°F
54°F to 67°F
59°F to 63°F
54°F to 59°F
56°F to 59°F
50°F to 56°F
43°F to 54°F
41°F to 56°F
50°F to 59°F
54°F to 61°F
49°F to 65°F
49°F to 65°F
49°F to 68°F
54°F to 68°F
54°F to 67°F
52°F to 67°F
59°F to 65°F
58°F to 63°F
54°F to 58°F
50°F to 52°F
54°F to 56°F
49°F to 56°F
47°F to 56°F
49°F to 56°F
56°F to 59°F
Map: other cities in Wales in september
Cities near Carmarthen:
| Llanelli in september | good weather |
| Swansea in september | good weather |
| Haverfordwest in september | good weather |
| Pembrokeshire in september | good weather |
| Fishguard in september | good weather |
| Porthcawl in september | good weather |
| Aberystwyth in september | good weather |
| Brecon Beacons (National Park) in september | tolerable weather |
| Merthyr Tydfil in september | good weather |
| Llandrindod Wells in september | tolerable weather |
| Barry in september | good weather |
| Cardiff in september | good weather |
Click over cities on the map for information about the weather in september.
Carmarthen
perfect weather
good
tolerable
bad
very bad
Weather data for Carmarthen in september:
Weather data for Carmarthen for september are derived from an average of the weather forecast since 2009 in Carmarthen. There is a margin of error and these forecasts are to be considered as general information only. The weather in Carmarthen can vary slightly from year to year, but this data should limit surprises. So you can pack your bags or check for the best time in year to go to Carmarthen.