Letterkenny Weather in May
What's the weather like in Letterkenny (Ulster) in May 2025?
The climate in Letterkenny during May can be summarized as cool and a little damp.
May is in the spring in Letterkenny and is typically the 6th warmest month of the year. Daytime maximum temperatures average around a cool 13°C (56°F), whilst at night 5°C (42°F) is normal.
| Daytime temperature | 13.4°C 56.1°F |
|---|---|
| Nightly temperature | 5.4°C 41.7°F |
| Average temperature | 9.4°C 48.9°F |
| Daily sunshine | 6 hrs |
| Avg rainfall | 82 mm 3.2 ins |
| Rainy days | 19 days |
| Sea temperature | 10.5°C 50.9°F |
| Humidity | 84% |
| Windspeed | 20.5kph 13 mph |
On average May is the 3rd driest month of the year in Letterkenny with around 82mm 3.2 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 19 days, although this may vary considerably.
On the flip side this corresponds to an average of 6 hours of sunshine per day.
May temperatures in Letterkenny
May rainfall
May 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 May 2025.
Other monthly averages
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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