Spring (March–May): Average 46–55°F, mild and rainy with occasional sunshine. Common activities: Walking along Cardiff Bay, visiting Cardiff Castle. Suggested clothing: Light jacket, comfortable shoes, umbrella.
Summer (June–August): Average 59–62°F, warm and humid with occasional rain. Common activities: Boating on Cardiff Bay, exploring Cardiff city centre shops and restaurants, visiting St Fagans National Museum of History. Suggested clothing: Light and breathable clothing, rain gear.
Autumn (September–November): Average 48–55°F, cool and humid with increased rainfall. Common activities: Visiting museums and art galleries, enjoying Cardiff's café culture. Suggested clothing: Warm jacket, waterproof jacket, comfortable shoes.
Winter (December–February): Average 41–46°F, cold and humid with high rainfall. Common activities: Visiting indoor museums, enjoying Cardiff's Christmas celebrations. Suggested clothing: Warm coat, scarf, hat, gloves, waterproof jacket and waterproof shoes.
Cardiff climatological average
Annual average temperature: approx. 52.9°F / Annual rainfall: approx. 1182 mm / Summer humidity: 65%–75% / Rainiest month: December
Cardiff monthly average temperature and precipitation
Month
Air temperature (°F)
Precipitation (mm)
January
42.6°F
94.7
February
45.7°F
102.5
March
46.4°F
121.2
April
49.1°F
80.6
May
55.8°F
72.5
June
60.1°F
37.4
July
62.4°F
89.2
August
63.5°F
64.3
September
59.9°F
89.5
October
55.6°F
124.8
November
48.9°F
149.2
December
45°F
156.4
Cardiff weather for the next seven days
5/6
Wednesday
Patchy rain nearby
53.9°F/45.9°F
5/7
Thursday
Patchy rain nearby
55.9°F/43.3°F
5/8
Friday
Patchy rain nearby
59°F/46.4°F
5/9
Saturday
Patchy rain nearby
61.5°F/46.3°F
5/10
Sunday
Partly Cloudy
58.2°F/45.3°F
5/11
Monday
Patchy rain nearby
51.2°F/45°F
5/12
Tuesday
Moderate rain
48.8°F/44.9°F
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