When to go · United Kingdom

When to go to Cardiff

Twelve months of averages for Cardiff, and what they say about when to go.

National Museum Cardiff · Photo: Ham II · CC BY-SA 3.0 · Wikimedia Commons

When to go

What the averages say

Mean daily highs and lows and the month's rain, averaged over 2001 to 2020.

On these averages, Cardiff has a mean high between 18°C and 32°C and under 150 mm of rain in June to September.

Cold months (a mean high under 10°C): December to March.
The warmest month is July (20°C) and the coolest January (7°C). The wettest is December (104 mm) and the driest April (56 mm); about 966 mm of rain falls in a year.

How these sentences are worded

Each sentence is written from the figures by fixed rules, and says no more than they do. Mild to warm: a mean daily high from 18°C up to 32°C. Hot: 32°C or more. Cool: 10°C up to 18°C. Cold: under 10°C. Dry: under 50 mm of rain in the month; wet: 150 mm or more. Humid: a high of 25°C or more with relative humidity of 70% or more. A month is described as good for going when it is mild to warm and not wet.

Cardiff: highs, lows and rainHighLowRain

The year at a glance

Mild to warm and dry
Mild to warm, humid or showery
Hot
Cool
Wet
Cold

JanCold
FebCold
MarCold
AprCool
MayCool
JunMild–warm, mixed
JulMild–warm, mixed
AugMild–warm, mixed
SeptMild–warm, mixed
OctCool
NovCool
DecCold

Month by month

Every month in Cardiff

The whole year, with humidity, cloud and the sunlight reaching the ground.

Climate in Cardiff by month: mean daily high and low, rain, and what the month is like
Month	High	Low	Rain	Humidity	Cloud	Sunlight (kWh/m²/day)	High in Dubai	What it is like
January	7°C	3°C	94 mm	93%	80%	0.8	23°C	Cold
February	7°C	3°C	73 mm	91%	79%	1.5	24°C	Cold
March	9°C	3°C	70 mm	89%	75%	2.7	27°C	Cold
April	12°C	5°C	56 mm	85%	69%	4.1	31°C	Cool
May	16°C	8°C	67 mm	83%	70%	5	35°C	Cool
June	18°C	11°C	72 mm	82%	71%	5.3	37°C	Mild to warm, humid or showery
July	20°C	13°C	80 mm	82%	70%	5	39°C	Mild to warm, humid or showery
August	20°C	13°C	84 mm	84%	73%	4.2	39°C	Mild to warm, humid or showery
September	18°C	11°C	63 mm	85%	70%	3.2	37°C	Mild to warm, humid or showery
October	14°C	9°C	100 mm	89%	76%	1.8	34°C	Cool
November	10°C	6°C	103 mm	92%	81%	1	29°C	Cool
December	8°C	4°C	104 mm	93%	82%	0.6	25°C	Cold

The Dubai column is Dubai's mean daily high, for comparison.

Modelled averages for an area about 50 km across, not a weather station's record: NASA POWER climatology, 2001–2020. These data were obtained from the NASA Langley Research Center (LaRC) POWER Project funded through the NASA Earth Science/Applied Science Program.

When to go nearby

Plan it

Plan a trip to Cardiff

Tell us when and who is travelling, and a person puts the flights, the stays and the rest into one quote.

Plan a trip to Cardiff More about Cardiff When to go

Month

High

Low

Rain

Humidity

Cloud

Sunlight (kWh/m²/day)

High in Dubai

What it is like

January

7°C

3°C

94 mm

93%

80%

0.8

23°C

Cold

February

7°C

3°C

73 mm

91%

79%

1.5

24°C

Cold

March

9°C

3°C

70 mm

89%

75%

2.7

27°C

Cold

April

12°C

5°C

56 mm

85%

69%

4.1

31°C

Cool

May

16°C

8°C

67 mm

83%

70%

35°C

Cool

June

18°C

11°C

72 mm

82%

71%

5.3

37°C

Mild to warm, humid or showery

July

20°C

13°C

80 mm

82%

70%

39°C

Mild to warm, humid or showery

August

20°C

13°C

84 mm

84%

73%

4.2

39°C

Mild to warm, humid or showery

September

18°C

11°C

63 mm

85%

70%

3.2

37°C

Mild to warm, humid or showery

October

14°C

9°C

100 mm

89%

76%

1.8

34°C

Cool

November

10°C

6°C

103 mm

92%

81%

29°C

Cool

December

8°C

4°C

104 mm

93%

82%

0.6

25°C

Cold