Letterkenny weather
Our guide to the weather in Letterkenny during September
We've looked at the most up-to-date weather data for Letterkenny, 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 Letterkenny weather in September.
What's the temperature like in Letterkenny during September?
The temperature reaches around 16℃ during the daytime in September, falling away to 8℃ 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 Letterkenny during September?
On average, there will be 6 rainy days during the month, amounting to 59.4mm 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 Letterkenny 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.
Weather in Letterkenny
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