Will it rain in
Cardiff today?
Live hourly rain forecast and run verdict for Cardiff, Wales, UK.
Running in Cardiff means dealing with the Welsh capital's frequent showers and coastal breezes. Whether it's drizzle drifting in from the Bristol Channel, a damp lap around Bute Park, or gusty winds along Cardiff Bay, knowing whether to head out before you lace up matters. RainOrRun checks live conditions in Cardiff right now and gives you an instant verdict — plus the best hourly window if the weather's on the fence. We'll also recommend the right gear for whatever Cardiff's Atlantic-influenced weather is throwing at you today.
What to wear
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How often does it rain in Cardiff?
Cardiff records around 1216mm of rain a year, spread across about 171 days — roughly 47% of all days, or 14 days in an average month. That is a genuinely wet climate for running. Rain falls on more days than not in Cardiff, so the realistic approach is to run in it rather than around it — which makes a breathable waterproof and good grip the two things worth spending on.
The wettest month is December, averaging 143mm across about 17 rainy days. The driest is June, with 66mm over roughly 12 days. Average lows bottom out around 3°C in January — long-sleeve and light-glove weather rather than full winter kit. Summer highs peak around 20.5°C in July, comfortable for most daytime running.
Those are ten-year averages, not a forecast. What actually matters on the day is the next twelve hours — which is what the live verdict and hourly strip at the top of this page are for.
| Month | Rainfall | Rainy days | Avg high | Avg low |
|---|---|---|---|---|
| January | 102mm | 15 | 8.1°C | 3°C |
| February | 106mm | 14 | 8.9°C | 3.6°C |
| March | 107mm | 16 | 10.3°C | 4.3°C |
| April | 67mm | 11 | 13.1°C | 5.4°C |
| May | 83mm | 12 | 16.3°C | 8.8°C |
| June | 66mm | 12 | 19.2°C | 11.8°C |
| July | 86mm | 15 | 20.5°C | 13.6°C |
| August | 101mm | 15 | 20.1°C | 13.5°C |
| September | 105mm | 13 | 18.2°C | 11.7°C |
| October | 138mm | 16 | 14.8°C | 9.4°C |
| November | 112mm | 15 | 11°C | 6.1°C |
| December | 143mm | 17 | 9.4°C | 5°C |
Historical data: Open-Meteo archive, 2015–2024. A “rainy day” means at least 1mm of precipitation.
Running in Cardiff: common questions
Will it rain in Cardiff today?
The forecast card at the top of this page shows Cardiff's rain probability for the current hour, plus an hour-by-hour breakdown for the rest of the day, using live Open-Meteo data. Historically, Cardiff sees rain on about 171 days a year, so on any given day there is roughly a 47% chance of some rain falling.
Is it a good day to run in Cardiff?
RainOrRun scores the live Cardiff forecast on rain probability, rainfall amount, temperature, wind speed and severe weather, then returns a single verdict: Go, Maybe, or Don't Bother. A Maybe means conditions are borderline and it is worth picking your window rather than skipping the run.
What is the best time to run in Cardiff today?
The hourly strip above highlights the best single window of the day for Cardiff — the hour combining the lowest rain probability with the most comfortable temperature. You can also check up to eight days ahead using the date picker if you are planning a long run or a race.
What should I wear running in Cardiff today?
The gear section on this page updates with the live Cardiff forecast: a waterproof jacket and peaked cap when rain probability goes above 40%, a thermal base layer and gloves below 8 degrees Celsius, and a high-vis vest when wind or low light make you harder to see.
What is the wettest month in Cardiff?
December is the wettest month in Cardiff, averaging 143mm of rain across about 17 rainy days. June is the driest, with around 66mm over roughly 12 days. Figures are ten-year averages covering 2015 to 2024.
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