Donegal Weather in September
What's the weather like in Donegal (Ulster) in September 2024?
The climate in Donegal during September can be summarized as mild and wet.
September is in the fall / autumn in Donegal 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 (46°F) is normal.
| Daytime temperature | 15.1°C 59.1°F |
|---|---|
| Nightly temperature | 7.8°C 46°F |
| Average temperature | 11.4°C 52.5°F |
| Daily sunshine | 3.7 hrs |
| Avg rainfall | 145 mm 5.7 ins |
| Rainy days | 22 days |
| Sea temperature | 13.9°C 57°F |
| Humidity | 91% |
| Windspeed | 19.4kph 12 mph |
On average September is the 5th wettest month of the year in Donegal with around 145mm 5.7 inches of rain making it a wet 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 3.7 hours of sunshine per day.
September temperatures in Donegal
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 Donegal in September 2024.
Other monthly averages
Best places to visit in September
Donegal weather stats
| Hottest month: | July | 17.2°C 63°F |
|---|---|---|
| Driest month: | April | 84mm 3.3ins |
| Sunniest month: | April | 5.1hrs |
| Coldest month: | January | 6.1°C 43°F |
| Wettest month: | December | 173mm 6.8ins |
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