The weather in Letterkenny in December is very cold with temperatures between 2°C and 7°C, warm clothes are a must.
You can expect rain for roughly half of the month of December in Letterkenny. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Please note that Letterkenny can expect a few days of snow in December.
Our weather forecast can give you a great sense of what weather to expect in Letterkenny in December 2025.
If you’re planning to visit Letterkenny in the near future, we highly recommend that you review the 14 day weather forecast for Letterkenny before you arrive.
Temperatures
7° / 2°
Rainy Days
8
Snowy Days
2
Dry Days
21
Rainfall
76
mm
Sun Hours
2.4
Hrs
