Letterkenny weather by month

Check out Letterkenny weather averages by month. Compare detailed monthly climate statistics including temperature, rainfall and sunshine figures.

Temperature
Rainfall
Sunshine & UV index

Temperature in Letterkenny (°C)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Max temperature (daytime)	7	7	8	11	13	16	17	17	15	12	9	7
Min temperature (night-time)	1	1	2	3	5	8	10	10	8	7	3	2
Heat & Humidity	0	0	0	0	0	0	0	0	0	0	0	0

Note: 0 = None, L = Low, M = Moderate, H = High, VH = Very high, E = Extreme

Sunshine & UV index in Letterkenny

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Daily hours of sunshine	1	2	3	5	6	5	4	4	3	2	2	1
Daily hours of daylight	8	10	12	14	16	17	17	15	13	10	8	7
UV Index (Maximum)	0	1	2	3	5	6	6	5	3	2	1	0

Rainfall in Letterkenny

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Number of days with some rain	24	19	22	18	19	19	20	21	22	23	23	23
Average monthly rainfall (mm)	137	96	98	74	82	78	87	98	120	132	137	141

More about Letterkenny

Letterkenny by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for Ireland

Fred Olsen: Top cruise offers for 2026/2027

Sale

Explore latest offers on Fred Olsen Cruises in 2026/2027
Find last minute deals or early bird discounts
Filter offers by price, destination, ship & departure point

Go to Fred Olsen deal >>

View all Fred Olsen offers

Cruise deal finder

Destination

The climate guide for Ireland (Letterkenny) shows long term monthly weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

What's the climate like in Letterkenny?

Letterkenny has a temperate climate with warm summers and some rainfall in all months.

Letterkenny weather in January

Expect daytime maximum temperatures of 7°C in Letterkenny, Ireland in January based on long-term weather averages. There is 1 hour of sunshine per day on average with 24 days with some rainfall and typically 137 mm of rainfall in the month.

7
7°C max day temperature
1
1 hour of sunshine per day
24
24 days with some rainfall
1
1°C min night temperature
8
8 hours of daylight per day
0
No heat & humidity
137
137 mm of monthly rainfall
0
No UV (Maximum) Index UV index

Back to months

Letterkenny weather in February

Expect daytime maximum temperatures of 7°C in Letterkenny, Ireland in February based on long-term weather averages. There are 2 hours of sunshine per day on average with 19 days with some rainfall and typically 96 mm of rainfall in the month.

7
7°C max day temperature
2
2 hours of sunshine per day
19
19 days with some rainfall
1
1°C min night temperature
10
10 hours of daylight per day
0
No heat & humidity
96
96 mm of monthly rainfall
1
1 (Low) UV index

Back to months

Letterkenny weather in March

Expect daytime maximum temperatures of 8°C in Letterkenny, Ireland in March based on long-term weather averages. There are 3 hours of sunshine per day on average with 22 days with some rainfall and typically 98 mm of rainfall in the month.

8
8°C max day temperature
3
3 hours of sunshine per day
22
22 days with some rainfall
2
2°C min night temperature
12
12 hours of daylight per day
0
No heat & humidity
98
98 mm of monthly rainfall
2
2 (Low) UV index

Back to months

Letterkenny weather in April

Expect daytime maximum temperatures of 11°C in Letterkenny, Ireland in April based on long-term weather averages. There are 5 hours of sunshine per day on average with 18 days with some rainfall and typically 74 mm of rainfall in the month.

11
11°C max day temperature
5
5 hours of sunshine per day
18
18 days with some rainfall
3
3°C min night temperature
14
14 hours of daylight per day
0
No heat & humidity
74
74 mm of monthly rainfall
3
3 (Moderate) UV index

Back to months

Letterkenny weather in May

Expect daytime maximum temperatures of 13°C in Letterkenny, Ireland in May based on long-term weather averages. There are 6 hours of sunshine per day on average with 19 days with some rainfall and typically 82 mm of rainfall in the month.

13
13°C max day temperature
6
6 hours of sunshine per day
19
19 days with some rainfall
5
5°C min night temperature
16
16 hours of daylight per day
0
No heat & humidity
82
82 mm of monthly rainfall
5
5 (Moderate) UV index

Back to months

Letterkenny weather in June

Expect daytime maximum temperatures of 16°C in Letterkenny, Ireland in June based on long-term weather averages. There are 5 hours of sunshine per day on average with 19 days with some rainfall and typically 78 mm of rainfall in the month.

16
16°C max day temperature
5
5 hours of sunshine per day
19
19 days with some rainfall
8
8°C min night temperature
17
17 hours of daylight per day
0
No heat & humidity
78
78 mm of monthly rainfall
6
6 (High) UV index

Back to months

Letterkenny weather in July

Expect daytime maximum temperatures of 17°C in Letterkenny, Ireland in July based on long-term weather averages. There are 4 hours of sunshine per day on average with 20 days with some rainfall and typically 87 mm of rainfall in the month.

17
17°C max day temperature
4
4 hours of sunshine per day
20
20 days with some rainfall
10
10°C min night temperature
17
17 hours of daylight per day
0
No heat & humidity
87
87 mm of monthly rainfall
6
6 (High) UV index

Back to months

Letterkenny weather in August

Expect daytime maximum temperatures of 17°C in Letterkenny, Ireland in August based on long-term weather averages. There are 4 hours of sunshine per day on average with 21 days with some rainfall and typically 98 mm of rainfall in the month.

17
17°C max day temperature
4
4 hours of sunshine per day
21
21 days with some rainfall
10
10°C min night temperature
15
15 hours of daylight per day
0
No heat & humidity
98
98 mm of monthly rainfall
5
5 (Moderate) UV index

Back to months

Letterkenny weather in September

Expect daytime maximum temperatures of 15°C in Letterkenny, Ireland in September based on long-term weather averages. There are 3 hours of sunshine per day on average with 22 days with some rainfall and typically 120 mm of rainfall in the month.

15
15°C max day temperature
3
3 hours of sunshine per day
22
22 days with some rainfall
8
8°C min night temperature
13
13 hours of daylight per day
0
No heat & humidity
120
120 mm of monthly rainfall
3
3 (Moderate) UV index

Back to months

Letterkenny weather in October

Expect daytime maximum temperatures of 12°C in Letterkenny, Ireland in October based on long-term weather averages. There are 2 hours of sunshine per day on average with 23 days with some rainfall and typically 132 mm of rainfall in the month.

12
12°C max day temperature
2
2 hours of sunshine per day
23
23 days with some rainfall
7
7°C min night temperature
10
10 hours of daylight per day
0
No heat & humidity
132
132 mm of monthly rainfall
2
2 (Low) UV index

Back to months

Letterkenny weather in November

Expect daytime maximum temperatures of 9°C in Letterkenny, Ireland in November based on long-term weather averages. There are 2 hours of sunshine per day on average with 23 days with some rainfall and typically 137 mm of rainfall in the month.

9
9°C max day temperature
2
2 hours of sunshine per day
23
23 days with some rainfall
3
3°C min night temperature
8
8 hours of daylight per day
0
No heat & humidity
137
137 mm of monthly rainfall
1
1 (Low) UV index

Back to months

Letterkenny weather in December

Expect daytime maximum temperatures of 7°C in Letterkenny, Ireland in December based on long-term weather averages. There is 1 hour of sunshine per day on average with 23 days with some rainfall and typically 141 mm of rainfall in the month.