Annual mean 11°C · wettest around March · prevailing wind SW
Warmest
20.7 °C
Coldest
6.4 °C
Wettest
42%
Windiest
5.9 m/s
Prevailing
SW
5.1 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 Caerdydd over the whole year is 11°C. July is the hottest month, with highs of about 20°C; January is the coldest, with lows of about 5°C. Caerdydd has no sharply defined rainy season: the chance of rain on a given day runs from 24% in July, the driest month, to 38% in March, the wettest. Winds in Caerdydd are highest in February, averaging 5.0 m/s (18 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 Caerdydd come in May, when the sky is typically 49% covered; December is the cloudiest month, at 71%.
Month by month Caerdydd 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
2°C
31%
65%
4.4 m/s
0
0
15
February
8°C
5°C
3°C
35%
66%
5.0 m/s
0
0
19
March
9°C
5°C
4°C
38%
64%
4.8 m/s
1
0
30
April
12°C
7°C
7°C
27%
53%
4.4 m/s
6
0
50
May
16°C
11°C
12°C
31%
49%
4.1 m/s
27
0
77
June
18°C
14°C
15°C
26%
56%
4.4 m/s
50
4
79
July
20°C
15°C
18°C
24%
55%
4.0 m/s
68
10
74
August
19°C
15°C
17°C
32%
58%
4.1 m/s
66
4
78
September
17°C
13°C
15°C
32%
57%
4.0 m/s
49
2
79
October
14°C
11°C
11°C
34%
62%
4.2 m/s
17
0
74
November
10°C
7°C
6°C
33%
65%
4.3 m/s
1
0
43
December
8°C
6°C
4°C
36%
71%
4.5 m/s
0
0
25
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 Caerdydd weather by season
Year round, Caerdydd has days of about 7°C at their warmest in January, its coolest month, and 20°C in July, its warmest; the coolest hours of the day run from 5°C to 15°C through the year, and the average temperature over the year is 11°C around the clock. Rain is most likely around March and least likely around July. 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.
Caerdydd weather in winterDecember to February
High 8°CLow 5°CRain 34%
Winter in Caerdydd has typical daily highs of about 8°C and lows of about 5°C, with a 34% chance of rain on a given day.
Caerdydd weather in springMarch to May
High 12°CLow 8°CRain 32%
Spring in Caerdydd has typical daily highs of about 12°C and lows of about 8°C, with a 32% chance of rain on a given day.
Caerdydd weather in summerJune to August
High 19°CLow 15°CRain 27%
Summer in Caerdydd has typical daily highs of about 19°C and lows of about 15°C, with a 27% chance of rain on a given day.
Caerdydd weather in autumnSeptember to November
High 14°CLow 10°CRain 33%
Autumn in Caerdydd has typical daily highs of about 14°C and lows of about 10°C, with a 33% chance of rain on a given day.
When is the rainy season in Caerdydd?
Caerdydd has no sharply defined rainy season: the chance of rain on a given day runs from 24% in July, the driest month, to 38% in March, the wettest.
What time of year is Caerdydd windiest?
Winds in Caerdydd are highest in February, averaging 5.0 m/s (18 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 Caerdydd year round?
The average temperature in Caerdydd over the whole year is 11°C. July is the hottest month, with highs of about 20°C; January is the coldest, with lows of about 5°C.