Dundalk weather

Our guide to the weather in Dundalk during September

16

Average high

3

UV Index

48mm

Monthly rainfall

88%

Humidity

We've looked at the most up-to-date weather data for Dundalk, covering the last 12 years up to 2024, plus we've asked our team of travel bloggers for their first-hand experiences in order to answer the most frequently asked questions about Dundalk weather in September.

What's the temperature like in Dundalk during September?

The temperature reaches around 16℃ during the daytime in September, falling away to 9℃ at night. The UV index will be moderate at this time of year, so not something to worry about for the average person. However, if you're going to be outside for long periods it's worth wearing a broad spectrum SPF 30+ sunscreen and UV-blocking sunglasses. Remember that bright surfaces, such as water and sand increase UV exposure.

Does it rain in Dundalk during September?

On average, there will be 4 rainy days during the month, amounting to 47.9mm in total. That's broadly comparable with the amount of rain we see in England during the summer months, and would be considered dry. There's a small chance that you'll catch a thunderstorm during your trip.

Is it windy in Dundalk during September?

You're unlikely to experience any strong winds. Expect a gentle breeze that increases to moderate at times during September. With moderate air temperatures, any breeze will feel cool.

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Weather in Dundalk

Our month-by-month guide to the weather and climate in Dundalk

6.6

Dundalk weather in

January
7.5

Dundalk weather in

February
9.1

Dundalk weather in

March
11.3

Dundalk weather in

April
13.7

Dundalk weather in

May
16.4

Dundalk weather in

June
17.9

Dundalk weather in

July
17.5

Dundalk weather in

August
15.7

Dundalk weather in

September
12.9

Dundalk weather in

October
9.3

Dundalk weather in

November
6.9

Dundalk weather in

December