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Greencastle Weather in September
Greencastle in September sees moderate temperatures, with highs around 16°C (61°F) and overnight lows of 12°C (54°F). Rainfall is fairly high at around 115 mm (4.5 in) on average, so pack waterproofs just in case.
Rainfall in Greencastle in September
You can expect rain on roughly 21 days based on historical data, averaging 115 mm (4.5 in) for the month. Expect frequent rainfall this month, and not just light drizzle. When it rains, it tends to come down hard.
Temperature in Greencastle in September
September in Greencastle brings moderate temperatures, with highs of 16°C (61°F) and nights around 12°C (54°F). Conditions are often most pleasant around the middle of the day. At 12°C (54°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping.
Sunshine in Greencastle in September
The area experiences a moderate amount of sunshine, with approximately 118 hours of sunlight expected. This means a decent mix of sun and overcast.So this is a great month to visit if you prefer dry days with pleasant temperatures.
Greencastle Temperature in September
Min Temperature
12°C (54°F)
Max Temperature
16°C (61°F)
Chance of Rain
70%
Precipitation
115 mm (4.5 in)
Rainy days
21 days
Sunshine
118 hours *
Percentage Sunshine
*
* Data from: Derry, Ireland (31 KM, 19 Miles).
Greencastle Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Greencastle - and find the best time to visit.
Best Places in Ireland in September
Find out more about the weather in Ireland and which places have the best travel conditions in this month. See all of Ireland in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Greencastle in September
Pack for changing conditions in Greencastle in September. Bring a mix of short and long sleeves, a warm layer like a hoodie or light jacket, and comfortable pants. The key is being able to add or remove layers as the days goes by. Prepare for significant rainfall with proper waterproof clothing and shoes. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.
What To Do in Greencastle in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming5/10 -
Cycling5/10 -
Walking5/10 -
Camping6/10 -
Outdoor sports9/10
Greencastle 3-Day Forecast
More climate data for Greencastle
See the full Greencastle climate overview or explore weather in Ireland.
Popular in September
Where to go in September - average daytime high across popular destinations.
Westport
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18°C (64°F) Cork18°C (64°F) Kenmare18°C (64°F) Killarney17°C (63°F) Galway18°C (64°F) Dublin18°C (64°F) Bucket list
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