Annual mean 10°C · wettest around December · prevailing wind W
Warmest
27.1 °C
Coldest
-0.2 °C
Wettest
21%
Windiest
4.5 m/s
Prevailing
W
3.6 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
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 27°C; January is the coldest, with lows of about -4°C. Derry has no sharply defined rainy season: the chance of rain on a given day runs from 11% in September, the driest month, to 17% in December, the wettest. Winds in Derry are highest in March, averaging 3.3 m/s (12 km/h), and lightest in August, at 2.1 m/s (8 km/h). The prevailing wind is from the W. The clearest skies in Derry come in November, when the sky is typically 51% covered; May is the cloudiest month, at 62%.
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
0°C
-4°C
-5°C
13%
59%
3.0 m/s
0
0
3
February
2°C
-3°C
-4°C
14%
57%
3.0 m/s
1
0
9
March
6°C
-0°C
0°C
13%
57%
3.3 m/s
2
0
19
April
12°C
5°C
7°C
16%
62%
3.2 m/s
13
1
47
May
18°C
11°C
15°C
12%
62%
2.7 m/s
45
10
70
June
24°C
16°C
22°C
12%
57%
2.4 m/s
69
29
53
July
27°C
20°C
27°C
12%
53%
2.3 m/s
48
55
22
August
26°C
18°C
26°C
11%
52%
2.1 m/s
61
49
30
September
22°C
14°C
21°C
11%
53%
2.1 m/s
71
24
62
October
16°C
9°C
13°C
15%
57%
2.3 m/s
41
4
73
November
9°C
2°C
4°C
14%
51%
2.7 m/s
9
0
30
December
2°C
-2°C
-3°C
17%
56%
2.7 m/s
0
0
8
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 0°C at their warmest in January, its coolest month, and 27°C in July, its warmest; the coolest hours of the day run from -4°C to 20°C through the year, and the average temperature over the year is 10°C around the clock. Rain is most likely around December and least likely around September. 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 1°CLow -3°CRain 14%
Winter in Derry has typical daily highs of about 1°C and lows of about -3°C, with a 14% chance of rain on a given day.
Derry weather in springMarch to May
High 12°CLow 5°CRain 14%
Spring in Derry has typical daily highs of about 12°C and lows of about 5°C, with a 14% chance of rain on a given day.
Derry weather in summerJune to August
High 26°CLow 18°CRain 12%
Summer in Derry has typical daily highs of about 26°C and lows of about 18°C, with a 12% chance of rain on a given day.
Derry weather in autumnSeptember to November
High 15°CLow 8°CRain 13%
Autumn in Derry has typical daily highs of about 15°C and lows of about 8°C, with a 13% 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 11% in September, the driest month, to 17% in December, the wettest.
What time of year is Derry windiest?
Winds in Derry are highest in March, averaging 3.3 m/s (12 km/h), and lightest in August, at 2.1 m/s (8 km/h). The prevailing wind is from the W.
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 27°C; January is the coldest, with lows of about -4°C.