Annual mean 10°C · wettest around February · prevailing wind SW
Warmest
18.0 °C
Coldest
6.4 °C
Wettest
43%
Windiest
7.2 m/s
Prevailing
SW
5.7 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 Derry over the whole year is 10°C. July is the hottest month, with highs of about 17°C; January is the coldest, with lows of about 5°C. Derry has no sharply defined rainy season: the chance of rain on a given day runs from 24% in May, the driest month, to 38% in February, the wettest. Winds in Derry are highest in February, averaging 6.2 m/s (22 km/h), and lightest in July, at 4.0 m/s (14 km/h). The prevailing wind is from the SW. The clearest skies in Derry come in April, when the sky is typically 62% covered; July is the cloudiest month, at 74%.
Month by month Derry 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%
71%
5.4 m/s
0
0
12
February
8°C
5°C
1°C
38%
68%
6.2 m/s
0
0
13
March
9°C
5°C
4°C
31%
69%
5.2 m/s
0
0
26
April
11°C
7°C
6°C
24%
62%
4.8 m/s
4
0
44
May
14°C
10°C
10°C
24%
62%
4.4 m/s
17
0
71
June
16°C
13°C
13°C
27%
71%
4.3 m/s
35
1
77
July
17°C
14°C
15°C
28%
74%
4.0 m/s
48
2
80
August
17°C
13°C
14°C
31%
68%
4.3 m/s
48
1
81
September
16°C
12°C
12°C
31%
66%
4.6 m/s
29
1
74
October
13°C
10°C
9°C
31%
67%
5.1 m/s
5
0
61
November
9°C
7°C
5°C
32%
68%
4.8 m/s
1
0
33
December
7°C
6°C
2°C
35%
71%
5.4 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 Derry weather by season
Year round, Derry has days of about 7°C at their warmest in January, its coolest month, and 17°C in July, 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.
Derry weather in winterDecember to February
High 7°CLow 5°CRain 35%
Winter in Derry has typical daily highs of about 7°C and lows of about 5°C, with a 35% chance of rain on a given day.
Derry weather in springMarch to May
High 12°CLow 7°CRain 26%
Spring in Derry has typical daily highs of about 12°C and lows of about 7°C, with a 26% chance of rain on a given day.
Derry weather in summerJune to August
High 17°CLow 13°CRain 29%
Summer in Derry has typical daily highs of about 17°C and lows of about 13°C, with a 29% chance of rain on a given day.
Derry weather in autumnSeptember to November
High 12°CLow 10°CRain 31%
Autumn in Derry has typical daily highs of about 12°C and lows of about 10°C, with a 31% chance of rain on a given day.
When is the rainy season in Derry?
Derry has no sharply defined rainy season: the chance of rain on a given day runs from 24% in May, the driest month, to 38% in February, the wettest.
What time of year is Derry windiest?
Winds in Derry are highest in February, averaging 6.2 m/s (22 km/h), and lightest in July, at 4.0 m/s (14 km/h). The prevailing wind is from the SW.
What is the average temperature in Derry year round?
The average temperature in Derry over the whole year is 10°C. July is the hottest month, with highs of about 17°C; January is the coldest, with lows of about 5°C.