Cardiff in september: average Weather, Temperature and Climate
Weather in Cardiff in september 2025
The weather in Cardiff in the month of september comes from statistical datas on the past years. You can view the weather statistics for the whole month, but also by clicking on 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
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%
Evolution of daily average temperature and precipitation in Cardiff in september
These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in Cardiff in september.
The climate of Cardiff in september is good
In september in Cardiff, the climate is rather dry (with 1.8in of precipitation over 3 days). The weather is better from the previous month since in august it receives an average of 2.8in of rainfall over 4 days.
The climate is rather cool around this city september, but it is liveable by dressing warm. The thermometer averaged maximum of 65°F. On average, the recorded minimum temperature is 54°F. Thus, the mean temperature average in september in Cardiff is 59°F. These temperatures are far removed from those records observed in Cardiff in september with a maximum record of 81°F in 2021 and a minimum record of 40°F in 2010. You can hope to have about 14 days with temperatures over 65°F, or 47% of the month.
On average, in Cardiff, the days of september last 12:39. The sun rises at 05:48 and sunset is at 18:27.
With a good climate, the month of september is a good time to go in this city in Wales.
Seasonal average climate and temperature of Cardiff in september
Check below seasonal norms These datas are compiled from the weather statements of the last years of the month of september.
| September | |||||
| Outside temperature | |||||
| Average temperature | 59°F | ||||
| Highest temperature | 65°F | ||||
| Lowest temperature | 54°F | ||||
| Highest record temperature | 81°F (2021) | ||||
| Lowest record temperature | 40°F (2010) | ||||
| Number of days at +65°F | 14 day(s) (47%) | ||||
| Sea temperature | |||||
| Average sea temperature | 62°F | ||||
| Lowest sea temperature | 61°F | ||||
| Highest sea temperature | 64°F | ||||
| Wind | |||||
| Wind speed | 21km/h | ||||
| Wind temperature | 52°F | ||||
| Precipitation (rainfall) | |||||
| Rainfall | 1.8in | ||||
| Number of days with rainfall | 3 day(s) (9%) | ||||
| Record daily rainfall | 0.6in (2019) | ||||
| Other climate data | |||||
| Humidity | 90% | ||||
| Visibility | 9.03km | ||||
| Cloud cover | 48% | ||||
| UV index | 5 | ||||
| Daily sunshine hours | 11 | ||||
| Sunrise and sunset | |||||
| Time of sunrise | 05:48 | ||||
| Time of sunset | 18:27 | ||||
| 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 Cardiff in september 2024:
58°F to 70°F
63°F to 67°F
59°F to 67°F
52°F to 61°F
54°F to 61°F
61°F to 65°F
58°F to 67°F
59°F to 63°F
54°F to 61°F
49°F to 59°F
49°F to 58°F
43°F to 58°F
43°F to 58°F
49°F to 61°F
50°F to 63°F
52°F to 67°F
49°F to 67°F
52°F to 70°F
56°F to 72°F
56°F to 68°F
56°F to 70°F
59°F to 65°F
58°F to 63°F
52°F to 59°F
52°F to 56°F
56°F to 59°F
49°F to 56°F
49°F to 56°F
49°F to 56°F
58°F to 59°F
Map: other cities in Wales in september
Cities near Cardiff:
| Barry in september | good weather |
| Merthyr Tydfil in september | good weather |
| Porthcawl in september | good weather |
| Brecon Beacons (National Park) in september | tolerable weather |
| Swansea in september | good weather |
| Llanelli in september | good weather |
| Llandrindod Wells in september | tolerable weather |
| Carmarthen in september | good weather |
| Newtown in september | tolerable weather |
| Aberystwyth in september | good weather |
| Pembrokeshire in september | good weather |
| Haverfordwest in september | good weather |
Click over cities on the map for information about the weather in september.
Cardiff
perfect weather
good
tolerable
bad
very bad
Weather data for Cardiff in september:
Weather data for Cardiff for september are derived from an average of the weather forecast since 2009 in Cardiff. There is a margin of error and these forecasts are to be considered as general information only. The weather in Cardiff 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 Cardiff.