Merthyr Tydfil in september: average Weather, Temperature and Climate
Weather in Merthyr Tydfil in september 2025
The weather in Merthyr Tydfil in the month of september comes from statistical datas on the last years. You can view the weather statistics for the whole month, but also by using the tabs for the beginning, the middle and the end of the month.
Average weather throughout september
good weather
Weather at 6am
52°F
Fog
32% of time
20%
19%
13%
Weather at 12pm
61°F
Partly Cloudy
30% of time
28%
21%
16%
Weather at 6pm
58°F
Partly Cloudy
30% of time
28%
20%
14%
Weather at 3am
52°F
30%
18%
17%
16%
Evolution of daily average temperature and precipitation in Merthyr Tydfil in september
These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in Merthyr Tydfil in september.
The climate of Merthyr Tydfil in september is good
The climate in september in Merthyr Tydfil is wet (with 2.8in of precipitation over 4 days). This is better than the previous month since in august it receives an average of 3.8in of rainfall over 6 days.
The climate is fairly cold in that area september, but it is tolerable when dressing cosy. The thermometer averaged maximum of 63°F. On average, the recorded minimum temperature is 52°F. Thus, the mean temperature average on this month of september in Merthyr Tydfil is 58°F. These temperatures are far removed from those records observed in Merthyr Tydfil in september with a maximum record of 79°F in 2021 and a minimum record of 38°F in 2020. You can plan to have about 8 days with temperatures up to 65°F, or 27% of time.
On this month of september, day length in Merthyr Tydfil is generally 12:39. The sun rises at 05:49 and sets at 18:28.
With a correct climate, this month is okay (but not the best) to go there in Wales.
Seasonal average climate and temperature of Merthyr Tydfil in september
Check below seasonal norms These statistics are set from the weather statements earlier years of september.
| September | |||||
| Outside temperature | |||||
| Average temperature | 58°F | ||||
| Highest temperature | 63°F | ||||
| Lowest temperature | 52°F | ||||
| Highest record temperature | 79°F (2021) | ||||
| Lowest record temperature | 38°F (2020) | ||||
| Number of days at +65°F | 8 day(s) (27%) | ||||
| Wind | |||||
| Wind speed | 20km/h | ||||
| Wind temperature | 50°F | ||||
| Precipitation (rainfall) | |||||
| Rainfall | 2.8in | ||||
| Number of days with rainfall | 4 day(s) (14%) | ||||
| Record daily rainfall | 1.6in (2019) | ||||
| Snowfall | 0cm | ||||
| Other climate data | |||||
| Humidity | 95% | ||||
| Visibility | 8.14km | ||||
| Cloud cover | 54% | ||||
| UV index | 4 | ||||
| Daily sunshine hours | 11 | ||||
| Sunrise and sunset | |||||
| Time of sunrise | 05:49 | ||||
| Time of sunset | 18:28 | ||||
| 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 Merthyr Tydfil in september 2024:
56°F to 68°F
61°F to 63°F
56°F to 63°F
49°F to 58°F
50°F to 59°F
59°F to 65°F
54°F to 67°F
58°F to 61°F
50°F to 58°F
54°F to 56°F
45°F to 52°F
41°F to 54°F
41°F to 56°F
47°F to 58°F
50°F to 59°F
50°F to 65°F
49°F to 63°F
50°F to 68°F
54°F to 70°F
54°F to 67°F
52°F to 68°F
58°F to 65°F
54°F to 61°F
49°F to 56°F
49°F to 52°F
52°F to 56°F
45°F to 52°F
47°F to 54°F
45°F to 52°F
54°F to 56°F
Map: other cities in Wales in september
Cities near Merthyr Tydfil:
| Brecon Beacons (National Park) in september | tolerable weather |
| Cardiff in september | good weather |
| Porthcawl in september | good weather |
| Barry in september | good 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.
Merthyr Tydfil
perfect weather
good
tolerable
bad
very bad
Weather data for Merthyr Tydfil in september:
Weather data for Merthyr Tydfil for september are derived from an average of the weather forecast since 2009 in Merthyr Tydfil. There is a margin of error and these forecasts are to be considered as general information only. The weather in Merthyr Tydfil 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 Merthyr Tydfil.