Best time to visit Cardiff
The best time to visit Cardiff is June, judged on twenty years of weather records and the events worth going for.
Cardiff, Wales, United Kingdom
°C
mm
- Average daily high and low
- Precipitation
- Good month
- Best month
- Made good or best by an event
| Month | Average daily high | Average daily low | Precipitation | Verdict |
|---|---|---|---|---|
| January | 7.5 °C / 46 °F | 3.4 °C / 38 °F | 95 mm / 3.7 in | neither best nor good |
| February | 7.9 °C / 46 °F | 3.6 °C / 38 °F | 81 mm / 3.2 in | neither best nor good |
| March | 9.6 °C / 49 °F | 4.3 °C / 40 °F | 76 mm / 3 in | neither best nor good |
| April | 12.5 °C / 55 °F | 5.9 °C / 43 °F | 56 mm / 2.2 in | good month |
| May | 15.3 °C / 60 °F | 8.9 °C / 48 °F | 79 mm / 3.1 in | good month |
| June | 18 °C / 64 °F | 11.9 °C / 53 °F | 75 mm / 2.9 in | best month |
| July | 19.7 °C / 67 °F | 13.7 °C / 57 °F | 87 mm / 3.4 in | good month |
| August | 19.1 °C / 66 °F | 13.6 °C / 56 °F | 90 mm / 3.5 in | good month |
| September | 17.5 °C / 64 °F | 11.7 °C / 53 °F | 81 mm / 3.2 in | good month |
| October | 14.3 °C / 58 °F | 9.6 °C / 49 °F | 105 mm / 4.1 in | neither best nor good |
| November | 10.7 °C / 51 °F | 6.4 °C / 44 °F | 111 mm / 4.4 in | neither best nor good |
| December | 8.4 °C / 47 °F | 4.6 °C / 40 °F | 114 mm / 4.5 in | neither best nor good |
Good and best months depend on more than temperature, rain and events. How they are chosen
Each activity on this page has its own good and best months, rated on twenty years of daily weather records. Which measures count, and how much, depends on the activity: humidity for exploring outdoors, wind for the beach, hiking and skiing, snow for skiing alone. Between them, the activities are rated on:
- Daytime highs
- Night-time lows
- How warm it feels
- Humidity
- How much of the day is sunny
- Hours of daylight
- Monthly rainfall
- How many days it rains
- Days of heavy rain
- Wind
- Snowfall and days with snow
- Major events, such as festivals
The chart shows the good and best months for exploring outdoors.
The event icon marks a month that an event lifts to good or best, such as a festival or a natural spectacle. Choose “Weather only” in the toolbar to rate the months on weather alone.
Best months by activity
Exploring outdoors
Mild days and nights, mostly dry and bright. The default for 'when should I go'.
- JJanuary: neither
- FFebruary: neither
- MMarch: neither
- AApril: good
- MMay: good
- JJune: best
- JJuly: good
- AAugust: good
- SSeptember: good
- OOctober: neither
- NNovember: neither
- DDecember: neither
- Best
- June
- Good
- April–May, July–September
Cardiff is at its best for exploring outdoors from April to September, peaking in June, thanks to milder temperatures and far more sunshine; October through March is cold, dark, damp and often feels colder still thanks to wind-chill.
Why these months
April · good
In its favour: share of daylight that is sunny 71%, days with heavy rain 1.2 days, average daily low 5.9 °C / 43 °F.
Against: feels like (high) 9.4 °C / 49 °F, average daily high 12.5 °C / 55 °F, wet days 10.3 days, precipitation 56 mm / 2.2 in, share of rain falling in the daytime 46%, relative humidity 77%.
Watch out for: Bank holiday weekend travel and price rush.
May · good
In its favour: share of daylight that is sunny 69%, feels like (high) 13 °C / 55 °F, average daily high 15.3 °C / 60 °F, average daily low 8.9 °C / 48 °F.
Against: wet days 12.5 days, days with heavy rain 2.5 days, precipitation 79 mm / 3.1 in, share of rain falling in the daytime 45%, relative humidity 78%.
Watch out for: Bank holiday weekend travel and price rush.
June · best
In its favour: feels like (high) 16.8 °C / 62 °F, average daily high 18 °C / 64 °F, share of daylight that is sunny 69%, days with heavy rain 1.9 days, average daily low 11.9 °C / 53 °F.
Against: wet days 11.4 days, precipitation 75 mm / 2.9 in, share of rain falling in the daytime 43%, relative humidity 78%.
Also on: Tafwyl.
July · good
In its favour: feels like (high) 18.8 °C / 66 °F, average daily high 19.7 °C / 67 °F, share of daylight that is sunny 70%, average daily low 13.7 °C / 57 °F.
Against: wet days 12.8 days, precipitation 87 mm / 3.4 in, days with heavy rain 2.5 days, share of rain falling in the daytime 48%, relative humidity 79%.
Also on: Tafwyl, The Welsh Proms.
August · good
In its favour: feels like (high) 17.9 °C / 64 °F, average daily high 19.1 °C / 66 °F, share of daylight that is sunny 68%, average daily low 13.6 °C / 56 °F.
Against: wet days 12.8 days, precipitation 90 mm / 3.5 in, days with heavy rain 2.9 days, share of rain falling in the daytime 47%, relative humidity 81%.
Watch out for: Bank holiday weekend travel and price rush.
September · good
In its favour: feels like (high) 15.9 °C / 61 °F, share of daylight that is sunny 65%, average daily high 17.5 °C / 64 °F, average daily low 11.7 °C / 53 °F.
Against: wet days 11.2 days, days with heavy rain 2.7 days, precipitation 81 mm / 3.2 in, share of rain falling in the daytime 45%, relative humidity 82%.
An activity is listed only where it applies: skiing at ski destinations, beach and swimming at beach destinations. The nearest ski area is Glencoe Mountain Resort, 581 km away.
Weather averages
Monthly averages over twenty years, 2006–2025. Highs, lows and precipitation are in the chart at the top.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels like (high) | 3.6 °C | 3.8 °C | 5.7 °C | 9.4 °C | 13 °C | 16.8 °C | 18.8 °C | 17.9 °C | 15.9 °C | 11.9 °C | 7.5 °C | 4.6 °C |
| Days with heavy rain | 3 days | 2.4 days | 2.1 days | 1.2 days | 2.5 days | 1.9 days | 2.5 days | 2.9 days | 2.7 days | 3.4 days | 3.5 days | 4.2 days |
| Time rain usually falls | 5 am | 3 pm | 5 pm | 4 pm | 4 pm | 2 pm | 2 pm | 12 pm | 5 pm | 11 am | 6 am | 3 pm |
| Sunshine per day | 4.3 h | 5.5 h | 7.4 h | 9.9 h | 10.8 h | 11.4 h | 11.3 h | 9.9 h | 8.1 h | 6 h | 4.7 h | 3.9 h |
| Relative humidity | 87% | 85% | 81% | 77% | 78% | 78% | 79% | 81% | 82% | 85% | 86% | 88% |
Air quality
Averaged over a shorter period (2022–2025) than the twenty-year averages above, and not counted towards good or best months.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Air pollution (PM2.5) 2022–2025 | 7.1 µg/m³ | 6.4 µg/m³ | 8.5 µg/m³ | 8.7 µg/m³ | 9.1 µg/m³ | 9 µg/m³ | 6.6 µg/m³ | 7.3 µg/m³ | 7.2 µg/m³ | 6.3 µg/m³ | 6 µg/m³ | 5.6 µg/m³ |
| Air pollution (PM2.5, daily peak) 2022–2025 | 12 µg/m³ | 10.8 µg/m³ | 14.5 µg/m³ | 14.4 µg/m³ | 14.4 µg/m³ | 14.4 µg/m³ | 11 µg/m³ | 11.1 µg/m³ | 11.1 µg/m³ | 9.9 µg/m³ | 10.2 µg/m³ | 9.2 µg/m³ |
- Good 15 µg/m³ or less
- Fair 15 to 25 µg/m³
- Moderate 25 to 37.5 µg/m³
- Poor 37.5 to 50 µg/m³
- Very poor 50 to 75 µg/m³
- Extremely poor over 75 µg/m³
Each figure is compared with the World Health Organization's guideline for a day's air, 15 µg/m³ or less, and with its interim targets above that. The words are ours: the WHO does not name its steps. The figures are modelled monthly averages, so single days can be well above them. The daily peak is the average of each day's highest hour, shaded on the same scale.
Events and seasons
What the weather records cannot show. A major event can lift a month to good or best. The warnings are there to help you plan, and never count against a month.
Reasons to go
- Winter Wonderland
January and December
- Six Nations rugby
February and March
- St David's Day Parade
1 March
- Tafwyl
June and July
- The Welsh Proms
July
- Armistice Day and Remembrance Sunday
11 November
- Boxing Day sales
26 December
Worth knowing before you go
- Christmas and New Year closures and travel rush
18 December–1 January
- Bank holiday weekend travel and price rush
January, March, April, May and August, dates vary from year to year