Llansteffan Weather in September
What's the weather like in Llansteffan (Wales) in September 2025?
The climate in Llansteffan during September can be summarized as mild and a little damp.
September is in the fall / autumn in Llansteffan and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 17°C (63°F), whilst at night 10°C (50°F) is normal.
| Daytime temperature | 17°C 62.6°F |
|---|---|
| Nightly temperature | 10.2°C 50.4°F |
| Average temperature | 13.6°C 56.5°F |
| Daily sunshine | 5 hrs |
| Avg rainfall | 99 mm 3.9 ins |
| Rainy days | 15 days |
| Sea temperature | 15.9°C 60.6°F |
| Humidity | 88% |
| Windspeed | 19.4kph 12 mph |
On average September is the 5th wettest month of the year in Llansteffan with around 99mm 3.9 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 15 days, although this may vary considerably.
On the flip side this corresponds to an average of 5 hours of sunshine per day.
September temperatures in Llansteffan
September rainfall
September hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Llansteffan in September 2025.
Other monthly averages
Best places to visit in September
Llansteffan weather stats
| Hottest month: | July | 19.1°C 66.4°F |
|---|---|---|
| Driest month: | May | 64mm 2.5ins |
| Sunniest month: | May | 7.2hrs |
| Coldest month: | February | 7.4°C 45.3°F |
| Wettest month: | October | 122mm 4.8ins |
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