Cardiff, United Kingdom Climate & Monthly Averages
The climate of Cardiff
Weather in Cardiff is shaped by its oceanic climate - expect mild temperatures year-round with regular rainfall. July afternoons typically reach 69°F (20°C), while January highs hover near 46°F (8°C). Annual precipitation averages 47.8 inches (1215 mm) over about 171 rainy days.
Climate quick facts
- Hottest month: July - highs near 69°F (20°C)
- Coldest month: January - highs near 46°F (8°C)
- Record high: 91°F (33°C) · Record low: 22°F (-6°C) (2015–2024)
- Wettest month: December (17 rainy days) · Sunniest: June (11.7 h sun/day)
- Climate type: oceanic - mild temperatures year-round with regular rainfall
- Snow: about 2 days a year
Temperatures through the year
The warmest stretch of the year centers on July. Highs average 69°F (20°C) and overnight lows stay near 56°F (13°C). The coolest month is January, with typical highs of 46°F (8°C) and lows around 37°F (3°C). Based on 2015–2024 weather data, temperatures have reached as high as 91°F (33°C) and dropped as low as 22°F (-6°C).
Rain, sun and snow
December is usually the wettest month. It brings about 5.6 inches (143 mm) of rain over 17 days, while June is the driest. June brings the most sunshine, averaging 11.7 hours of sun a day. Snowfall is rare but not unheard of.
Monthly climate table
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 46° | 37° | 15 | 4.0 in | 4.1 h/day | 87% |
| February | 48° | 38° | 14 | 4.2 in | 5.3 h/day | 84% |
| March | 50° | 39° | 16 | 4.2 in | 6.9 h/day | 81% |
| April | 55° | 41° | 11 | 2.6 in | 9.8 h/day | 76% |
| May | 61° | 47° | 12 | 3.3 in | 11.1 h/day | 77% |
| June | 66° | 53° | 12 | 2.6 in | 11.7 h/day | 76% |
| July | 69° | 56° | 15 | 3.4 in | 11.4 h/day | 77% |
| August | 68° | 56° | 15 | 4.0 in | 10.0 h/day | 80% |
| September | 64° | 53° | 13 | 4.1 in | 8.5 h/day | 82% |
| October | 58° | 48° | 16 | 5.4 in | 6.3 h/day | 84% |
| November | 51° | 43° | 15 | 4.4 in | 4.4 h/day | 87% |
| December | 49° | 41° | 17 | 5.6 in | 3.3 h/day | 89% |
Cardiff month by month
Cardiff weather in January
January brings highs around 46°F (8°C), lows near 37°F (3°C), about 15 wet days - typically the coldest month of the year in Cardiff.
Cardiff weather in February
February brings highs around 48°F (9°C), lows near 38°F (3°C), about 14 wet days.
Cardiff weather in March
March brings highs around 50°F (10°C), lows near 39°F (4°C), about 16 wet days.
Cardiff weather in April
April brings highs around 55°F (13°C), lows near 41°F (5°C), about 11 wet days.
Cardiff weather in May
May brings highs around 61°F (16°C), lows near 47°F (9°C), about 12 wet days.
Cardiff weather in June
June brings highs around 66°F (19°C), lows near 53°F (12°C), about 12 wet days - typically the driest month and the sunniest month of the year in Cardiff.
Cardiff weather in July
July brings highs around 69°F (20°C), lows near 56°F (13°C), about 15 wet days - typically the hottest month of the year in Cardiff.
Cardiff weather in August
August brings highs around 68°F (20°C), lows near 56°F (13°C), about 15 wet days.
Cardiff weather in September
September brings highs around 64°F (18°C), lows near 53°F (12°C), about 13 wet days.
Cardiff weather in October
October brings highs around 58°F (15°C), lows near 48°F (9°C), about 16 wet days.
Cardiff weather in November
November brings highs around 51°F (11°C), lows near 43°F (6°C), about 15 wet days.
Cardiff weather in December
December brings highs around 49°F (9°C), lows near 41°F (5°C), about 17 wet days - typically the wettest month of the year in Cardiff.
Seasons in Cardiff
Spring (March through May)
Spring in Cardiff is mild, with daytime highs averaging 55°F (13°C) and nights around 43°F (6°C); expect showers on roughly 39 days across the season.
Summer (June through August)
Summer in Cardiff is crisp but comfortable, with daytime highs averaging 67°F (20°C) and nights around 55°F (13°C); expect showers on roughly 42 days across the season.
Fall (September through November)
Fall in Cardiff is mild, with daytime highs averaging 58°F (14°C) and nights around 48°F (9°C); expect showers on roughly 44 days across the season.
Winter (December through February)
Winter in Cardiff is brisk and cold, with daytime highs averaging 47°F (9°C) and nights around 38°F (4°C); expect showers on roughly 46 days across the season.
Climate questions, answered
What is the average temperature in Cardiff?
Is Cardiff hot in summer?
Is Cardiff cold in winter?
How many rainy days does Cardiff get in a year?
Best time to visit Cardiff
The best time to visit Cardiff is generally April to September, when warm days, manageable rainfall and plenty of daylight line up. Daytime temperatures in that window typically sit near 64°F (18°C).
Pack for Cardiff with a warm jacket and layers for the cooler season; a compact umbrella or rain shell - showers are a regular feature. Evenings can feel noticeably cooler than afternoons - July nights average 56°F (13°C).
Cardiff temperature records (2015-2024)
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ.