September
Best time
18.3°C / 11.8°C
12 rain days
mild, rainy
- comfortable temperatures (avg high 18.3°C / 65°F)
Best time to visit Cardiff
Cardiff, United Kingdom — ranked month by month from data: temperature, rainfall, snow, and peak hazard seasons. The standouts: September, June, July.
Best · September & June
Best months to visit
June
Best time
19.2°C / 12°C
13 rain days
mild, rainy
- comfortable temperatures (avg high 19.2°C / 67°F)
July
Best time
20.6°C / 13.6°C
14 rain days
mild, rainy
- comfortable temperatures (avg high 20.6°C / 69°F)
May
Best time
16.1°C / 8.7°C
12 rain days
mild, rainy
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OK — shoulder months
August
OK
19.8°C / 13.4°C
15 rain days
mild, rainy
- comfortable temperatures (avg high 19.8°C / 68°F)
April
OK
13.1°C / 5.4°C
10 rain days
cool, rainy
- manageable rain (10 days)
October
OK
14.8°C / 9.5°C
15 rain days
cool, rainy
November
OK
11°C / 6.2°C
16 rain days
cool, very wet
March
OK
10.3°C / 4.2°C
16 rain days
cool, very wet
February
OK
8.7°C / 3.4°C
14 rain days
chilly, rainy
December
OK
9.2°C / 4.9°C
18 rain days
chilly, very wet
January
OK
8.2°C / 3.1°C
17 rain days
chilly, very wet
How we ranked these
Each month is scored on temperature comfort (18–27°C avg high is the sweet spot), rainfall (more rain days = lower score), snow days, and peak hazard seasons (hurricanes, monsoons, etc.). Green-tier months are within ideal range with no major issues. Yellow are workable but with trade-offs. Red has at least one significant problem — extreme heat or cold, heavy rain, or peak storm season.