Annual mean 10°C · wettest around February · prevailing wind SW
Warmest
17.9 °C
Coldest
6.3 °C
Wettest
43%
Windiest
7.1 m/s
Prevailing
SW
5.6 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
never good
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Letterkenny over the whole year is 10°C. August is the hottest month, with highs of about 17°C; January is the coldest, with lows of about 5°C. Letterkenny has no sharply defined rainy season: the chance of rain on a given day runs from 23% in May, the driest month, to 38% in February, the wettest. Winds in Letterkenny are highest in February, averaging 6.1 m/s (22 km/h), and lightest in July, at 3.9 m/s (14 km/h). The prevailing wind is from the SW. The clearest skies in Letterkenny come in May, when the sky is typically 65% covered; July is the cloudiest month, at 76%.
Month by month Letterkenny climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
7°C
5°C
1°C
34%
73%
5.3 m/s
0
0
12
February
8°C
5°C
1°C
38%
71%
6.1 m/s
0
0
13
March
9°C
5°C
3°C
32%
71%
5.0 m/s
0
0
25
April
11°C
6°C
6°C
24%
66%
4.6 m/s
4
0
45
May
14°C
10°C
10°C
23%
65%
4.2 m/s
19
0
71
June
16°C
12°C
13°C
27%
73%
4.2 m/s
35
1
77
July
17°C
14°C
15°C
28%
76%
3.9 m/s
47
2
80
August
17°C
13°C
14°C
32%
71%
4.2 m/s
47
1
80
September
15°C
11°C
12°C
31%
69%
4.4 m/s
28
1
74
October
13°C
10°C
8°C
32%
70%
4.9 m/s
4
0
61
November
9°C
7°C
5°C
32%
72%
4.8 m/s
1
0
33
December
7°C
6°C
2°C
35%
74%
5.3 m/s
0
0
17
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Letterkenny weather by season
Year round, Letterkenny has days of about 7°C at their warmest in January, its coolest month, and 17°C in August, its warmest; the coolest hours of the day run from 5°C to 14°C through the year, and the average temperature over the year is 10°C around the clock. Rain is most likely around February and least likely around May. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Letterkenny weather in winterDecember to February
High 7°CLow 5°CRain 36%
Winter in Letterkenny has typical daily highs of about 7°C and lows of about 5°C, with a 36% chance of rain on a given day.
Letterkenny weather in springMarch to May
High 11°CLow 7°CRain 26%
Spring in Letterkenny has typical daily highs of about 11°C and lows of about 7°C, with a 26% chance of rain on a given day.
Letterkenny weather in summerJune to August
High 17°CLow 13°CRain 29%
Summer in Letterkenny has typical daily highs of about 17°C and lows of about 13°C, with a 29% chance of rain on a given day.
Letterkenny weather in autumnSeptember to November
High 12°CLow 9°CRain 32%
Autumn in Letterkenny has typical daily highs of about 12°C and lows of about 9°C, with a 32% chance of rain on a given day.
When is the rainy season in Letterkenny?
Letterkenny has no sharply defined rainy season: the chance of rain on a given day runs from 23% in May, the driest month, to 38% in February, the wettest.
What time of year is Letterkenny windiest?
Winds in Letterkenny are highest in February, averaging 6.1 m/s (22 km/h), and lightest in July, at 3.9 m/s (14 km/h). The prevailing wind is from the SW.
What is the average temperature in Letterkenny year round?
The average temperature in Letterkenny over the whole year is 10°C. August is the hottest month, with highs of about 17°C; January is the coldest, with lows of about 5°C.