Dun Laoghaire weather in September (Dublin County, Ireland)

Will it be rainy or sunny in Dun Laoghaire this September? Want to know if it's a good time to visit? This page has all the weather details for the month.

Temperatures

Typically, September in Dun Laoghaire includes moderate temperatures and moderate rainfall. During September, the summer season is in full swing. During the day, temperatures usually reach up to 17°C. At night, they tend to fall to approximately 11°C.

Precipitation

Dun Laoghaire in September usually receives moderate rainfall, averaging around 80 mm for the month. Rain is expected on roughly 15 days.

Average sunshine

The month experiences a moderate amount of sunlight, with 128 hours hours. A nice balance between sunshine and clouds.

In case you lean more towards enjoying temperate temperatures and rain-free days July and August typically offer the most optimal weather. In contrast, January, February, March, November and December tend to have less optimal conditions.

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

 

Dun Laoghaire, monthly averages in September

Min Temperature 11°C  

Max Temperature 17°C  

Water Temperature 15°C *  

Chance of Rain 50%  

Precipitation 80 mm  

Rainy days 15 days  

Humidity 71% *  

Windspeed 14 km/h *  

Sunshine 128 hours *  

Percentage Sunshine 33% *  

* Data from: Dublin, Ireland (17 KM, 10 Miles).

Where to go in Ireland in September

Find out more about the weather in Ireland and which places have the best travel 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 this month?

For visitors traveling to Dun Laoghaire, 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. With a water temperature of around 15°C there is no need to bring your swimwear.

What To Do

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

Swimming

6/10

Cycling

6/10

Walking

6/10

Camping

8/10

Outdoor sports

9/10

Interested in more climate information?

This site provides you with all the information you need about the climate in Dun Laoghaire.

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 travel conditions. Find out where to go with our weather planner.