Greencastle Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Greencastle.
Climate overview of Greencastle
Greencastle, Donegal County, Ireland, experiences moderate temperature changes through the seasons. August is the warmest month with daytime highs of 17°C (63°F), while February is the coolest at 9°C (48°F).
The city receives considerable rainfall, with around 1421 mm (56 in) annually. November is the wettest month. The most sunshine falls in May, with an average of 6.8 hours of daily sunshine.
Greencastle Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Greencastle - and find the best time to visit.
Monthly Temperature in Greencastle
The climate in Greencastle experiences moderate temperature changes, with mild shifts between seasons. Typically, average maximum daytime temperatures range from a moderate 17°C (63°F) in August to a chilly 9°C (48°F) in the coolest month, February.
Nights vary from 13°C (55°F) in August to around 5°C (41°F) during the colder months.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Greencastle
Greencastle has a relatively rainy climate with high precipitation levels, averaging 1421 mm (56 in) of rainfall annually. Greencastle offers a pleasant mix of wetter and slightly drier months. The difference in precipitation between the wettest month November (148 mm (5.8 in)) and the driest month May (86 mm (3.4 in)) is not too significant. For more details, please visit our Greencastle Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Greencastle
For those who appreciate different seasons, Greencastle serves as an ideal destination. Expect longer, more sun-filled days in May with an average of 6.8 hours of sunshine daily, and embrace the darker days in December, offering only 1.3 hours of daily sunlight.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Best Time to Visit Greencastle
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: April, May, June, July, August, September and October
- Warmest weather: July, August and September
- Most sunshine: May
Frequently asked questions about the climate in Greencastle
What is the best time to visit Greencastle?
April, May, June, July, August, September and October typically offer the most optimal weather in Greencastle. In contrast, January, February, March, November and December tend to have less optimal conditions.
What temperatures can I expect in Greencastle?
Daytime highs range from 9°C (48°F) in February to 17°C (63°F) in August. Nighttime lows range from 5°C (41°F) to 13°C (55°F).
How much rain does Greencastle get?
Annual rainfall is around 1421 mm (56 in). November is the wettest month with 148 mm (5.8 in), while May is the driest with 86 mm (3.4 in).
How sunny is Greencastle?
Greencastle receives around 1,342 hours of sunshine per year. May is the sunniest month with 203 hours, while December is the cloudiest with just 39 hours.
Greencastle 3-Day Forecast
Greencastle on the map
Greencastle is highlighted - select any city to see its climate.
Popular this month
Where to go in August - average daytime high across popular destinations.
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