Winter (December to February)
Cool weather with highs around 9° and lows near 4°, very frequent rain (16 rainy days per month on average). Not an ideal time for a leisure trip.
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When to visit United Kingdom
Climate · 10-year averages
When to visit Cardiff?
Best time to visit Cardiff: in Juneandin September. Month-by-month temperatures, rainfall and sunshine, based on ten years of weather data.
Best time to go
In Juneandin September
Hottest month
July · 20°
Coldest month
January · 3°
Wettest month
December · 139 mm
Climate month by month
Bars: monthly rainfall. Lines: average highs and lows. Month color: our travel comfort index.
- JanuaryÀ éviter
8° / 3°
- Rain
- 111 mm · 17 d
- Sunshine
- 4.1 h/day
- Humidity
- 87%
- FebruaryÀ éviter
8° / 3°
- Rain
- 102 mm · 14 d
- Sunshine
- 5.6 h/day
- Humidity
- 83%
- MarchÀ éviter
10° / 4°
- Rain
- 97 mm · 16 d
- Sunshine
- 7.2 h/day
- Humidity
- 81%
- AprilCorrect
13° / 5°
- Rain
- 61 mm · 10 d
- Sunshine
- 9.9 h/day
- Humidity
- 76%
- MayCorrect
16° / 9°
- Rain
- 82 mm · 12 d
- Sunshine
- 11.1 h/day
- Humidity
- 77%
- JuneTrès bien
19° / 12°
- Rain
- 67 mm · 13 d
- Sunshine
- 11.7 h/day
- Humidity
- 76%
- JulyCorrect
20° / 13°
- Rain
- 80 mm · 14 d
- Sunshine
- 11.6 h/day
- Humidity
- 76%
- AugustCorrect
20° / 13°
- Rain
- 105 mm · 15 d
- Sunshine
- 10.2 h/day
- Humidity
- 80%
- SeptemberTrès bien
18° / 12°
- Rain
- 87 mm · 12 d
- Sunshine
- 8.7 h/day
- Humidity
- 81%
- OctoberMitigé
15° / 9°
- Rain
- 134 mm · 15 d
- Sunshine
- 6.2 h/day
- Humidity
- 84%
- NovemberÀ éviter
11° / 6°
- Rain
- 114 mm · 16 d
- Sunshine
- 4.5 h/day
- Humidity
- 87%
- DecemberÀ éviter
9° / 5°
- Rain
- 139 mm · 18 d
- Sunshine
- 3.5 h/day
- Humidity
- 88%
2014–2023 averages from the ERA5 reanalysis (Copernicus) via Open-Meteo. A day counts as a “rainy day” from 1 mm of rain.
Our take, season by season
Spring (March to May)
Cool weather with highs around 13° and lows near 6°, regular rain (13 rainy days per month on average). Not an ideal time for a leisure trip.
Summer (June to August)
Mild weather with highs around 20° and lows near 13°, regular rain (14 rainy days per month on average). A decent time to go, as long as you're willing to make a few compromises.
Fall (September to November)
Cool weather with highs around 15° and lows near 9°, regular rain (14 rainy days per month on average). Not an ideal time for a leisure trip.
Frequently asked questions
- When is the best time to visit Cardiff?
- The best time to visit Cardiff is in Juneandin September, with highs between 18° and 19° and few rainy days.
- What is the hottest month in Cardiff?
- July is the hottest month, with an average high of 20 °C.
- What is the coldest month in Cardiff?
- January is the coldest month, with an average low of 3 °C.
- When does it rain the most in Cardiff?
- December is the wettest month (139 mm, about 18 rainy days). The driest is April (61 mm).
- When should you avoid Cardiff?
- The least favorable months are from November to March: too hot, too cold, or too rainy to make the most of your trip.
When to visit other cities · United Kingdom
The capital and the country's other major cities.
More practical info: United Kingdom
- Country guideEverything about a country on one page: time, weather, currency, plugs, emergency numbers, tipping, visas.
- WeatherTemperature, rain, wind, and UV index for every capital.
- Air qualityPollution, fine particulate matter, and ozone, with a 36-hour forecast.
- Local timeLive clock, time zone, and time difference from where you are.
- Public holidaysEvery public holiday of the year, plus the next one coming up.
- Power OutletsPlug type, voltage, and whether your devices need an adapter.
- Driving SideWhich side of the road to drive on and which license you need before renting a car.
- Emergency NumbersPolice, ambulance, and fire department numbers for every country.
- TippingHow much to tip at restaurants, in taxis, and at hotels.
- Dialing CodesHow to call a country from abroad.
- Salat TimesFajr, Dhuhr, Asr, Maghrib, Isha, and Imsak times in every capital.
- QiblaReal-time compass pointing to the Kaaba from your GPS location.
- Visa requirements from FranceDo you need a visa for United Kingdom?