Average temperatures, rainfall and packing tips for Cardiff, United Kingdom in January
January in Cardiff is typically cool, with average daytime highs around 8°C and nights near 2°C. It is usually the coldest month of the year in Cardiff.
January is one of the wetter months in Cardiff, with around 85 mm of rain - plan around showers.
If your dates are flexible, the most comfortable months in Cardiff are usually June, July and August.
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In January, Cardiff averages a daytime high of about 8°C and a night-time low of around 2°C, based on recent historical data. That makes it the coldest month of the year there.
January is one of the wetter months in Cardiff, with around 85 mm of rain - plan around showers.
January is a workable time to visit Cardiff, with cool days - just pack accordingly. If your dates are flexible, the most comfortable months in Cardiff are usually June, July and August.