Letterkenny weather in September (Donegal County, Ireland)

What can you expect from the weather in Letterkenny during September? Check out this comprehensive weather guide.

In September, Letterkenny typically experiences moderate temperatures and moderate rainfall. Anticipate daytime temperatures around 17°C, while night temperatures can drop to 10°C.

Letterkenny in September usually receives moderate rainfall, averaging around 99 mm for the month. Rain is expected on roughly 22 days.

The area experiences a moderate amount of sunshine, with approximately 118 hours of sunlight expected. This makes it neither too gloomy nor overly bright.

If you favor pleasant temperatures and minimal rainfall, September is one of the better months to visit Letterkenny. May, July, August and September typically offer the most agreeable circumstances. On the other hand, January, February, November and December tend to be characterized by conditions that may not be as optimal.

For an in-depth look at the yearly conditions, visit our specialized Letterkenny climate page with graphs.

 

Letterkenny, monthly averages in September

Min Temperature 10°C  

Max Temperature 17°C  

Chance of Rain 72%  

Precipitation 99 mm  

Rainy days 22 days  

Sunshine 118 hours *  

Percentage Sunshine *  

* Data from: Derry, Ireland (27 KM, 17 Miles).

Where to go in Ireland in September

Find out more about the weather in Ireland in September and which places have the best weather conditions in this month.

Weather conditions Weather

Temperatures

Precipitation

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Legend perfect weather pleasant tolerable unpleasant poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C and 29°C and not too much precipitation (less than 90 mm a month).

So, what should you wear in Letterkenny in September?

For visitors traveling to Letterkenny, we recommend wearing layers. So maybe a skirt, t-shirt, shorts for during the day and jeans and a warm jacket for some days and evenings. Bring a rain jacket in case it rains during your stay. Plan on layering your clothes.

What To Do

We rated the following activities from 1 (least suitable) to 10 (best) to do in September.

Swimming

5/10

Cycling

6/10

Walking

6/10

Camping

8/10

Outdoor sports

9/10

Interested in more climate information?

Weather and Climate provides you with all the information you need about the climate in Letterkenny.

Our site offers climate and forecast data for every country in the world. Are you going to Ireland? On this website you can find historical weather averages for many cities in Ireland. Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal climate conditions. Find out where to go with our weather planner.