Letterkenny Weather in September
What's the weather like in Letterkenny (Ulster) in September 2024?
The climate in Letterkenny during September can be summarized as mild and damp.
September is in the fall / autumn in Letterkenny and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a cool 15°C (59°F), whilst at night 8°C (47°F) is normal.
| Daytime temperature | 15.1°C 59.2°F |
|---|---|
| Nightly temperature | 8.3°C 46.9°F |
| Average temperature | 11.7°C 53.1°F |
| Daily sunshine | 3.8 hrs |
| Avg rainfall | 120 mm 4.7 ins |
| Rainy days | 22 days |
| Sea temperature | 14.1°C 57.4°F |
| Humidity | 90% |
| Windspeed | 21.6kph 14 mph |
On average September is the 5th wettest month of the year in Letterkenny with around 120mm 4.7 inches of rain making it a damp time to visit. This rainfall is typically spread over 22 days, although this may vary considerably.
On the flip side this corresponds to an average of 3.8 hours of sunshine per day.
September temperatures in Letterkenny
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 Letterkenny in September 2024.
Other monthly averages
Best places to visit in September
Letterkenny weather stats
| Hottest month: | July | 16.8°C 62.2°F |
|---|---|---|
| Driest month: | April | 74mm 2.9ins |
| Sunniest month: | April | 5.3hrs |
| Coldest month: | January | 6.4°C 43.5°F |
| Wettest month: | December | 141mm 5.6ins |
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