Letterkenny weather live forecast

Today's maximum temperature in Letterkenny is expected to be 18°C. Select a day from the live weather forecast for Letterkenny, Ireland for more weather parameters.

Thursday
21st May
18

12

1

UV1
Friday
22nd May
19

12

2

UV4
Saturday
23rd May
18

10

3

UV4
Sunday
24th May
20

11

1

UV3
Monday
25th May
20

11

9

UV6

5-day weather forecast updated at 04:03 on Thursday 21st May 2026 GMT

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The 5-day weather forecast for Ireland (Letterkenny) is provided by the Swiss meteorological agency, meteoblue. Find out more about our data sources.

Letterkenny weather forecast by day

Below are the detailed weather forecasts for Letterkenny for the next 5 days.

Letterkenny weather for Thursday 21st May 2026

Expect mostly cloudy with light rain in Letterkenny, Ireland with a maximum temperature of 18°C, maximum UV of 1 (Low) and 1 hour of bright sunshine. There are 2-5 mm of rainfall expected with 79% chance of some rain and a moderate breeze of 25 kph from the south.

18
°C maximum temperature
12
°C minimum temperature
mostly cloudy with light rain
1
hour of sunshine
UV1
UV index (Low)
79
% chance of some rain
<5
mm of rainfall expected
0
no heat & humidity
25
kph wind from S

Letterkenny weather for Friday 22nd May 2026

Expect mostly cloudy with light rain in Letterkenny, Ireland with a maximum temperature of 19°C, maximum UV of 4 (Moderate) and 2 hours of bright sunshine. There are 2-5 mm of rainfall expected with 62% chance of some rain and a moderate breeze of 21 kph from the south.

19
°C maximum temperature
12
°C minimum temperature
mostly cloudy with light rain
2
hours of sunshine
UV4
UV index (Moderate)
62
% chance of some rain
<5
mm of rainfall expected
19
°C wind chill
21
kph wind from S

Letterkenny weather for Saturday 23rd May 2026

Expect broken clouds in Letterkenny, Ireland with a maximum temperature of 18°C, maximum UV of 4 (Moderate) and 3 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 24 kph from the south-west.

18
°C maximum temperature
10
°C minimum temperature
broken clouds
3
hours of sunshine
UV4
UV index (Moderate)
0
mm of rainfall expected
18
°C wind chill
24
kph wind from SW

Letterkenny weather for Sunday 24th May 2026

Expect overcast skies in Letterkenny, Ireland with a maximum temperature of 20°C, maximum UV of 3 (Moderate) and 1 hour of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 19 kph from the south.

20
°C maximum temperature
11
°C minimum temperature
overcast skies
1
hour of sunshine
UV3
UV index (Moderate)
0
mm of rainfall expected
0
no heat & humidity
19
kph wind from S

Letterkenny weather for Monday 25th May 2026

Expect broken clouds in Letterkenny, Ireland with a maximum temperature of 20°C, maximum UV of 6 (High) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 13 kph from the south-west.