Our verdict
The best time to visit Cardiff is June-September
In summer, the average maximum temperature is around 19℃ (66℉), but temperatures can sometimes reach as high as 22℃ (72℉) on the hottest days of the year. The coldest it usually gets in winter-time in Cardiff is around 1℃ (33℉).
If you’re a sun-chaser and want to visit Cardiff when the days are longest, you should visit in July. November sees the most amount of rain in a month if you’re ok with chancing getting drenched, so if you’re looking to stay dry, visit in April instead.
Keep reading to find out more detailed information about the seasons and climate in Cardiff, as well as our favourite tools to help you find the best options for transport, accommodation, and much more.
Quick links: Fast facts / Seasons / Average temperatures / Monthly climate / FAQs / Map
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Cardiff seasons
Before you continue, it’s important to know when the seasons are in Cardiff as they might be different to yours depending on where in the world you’re travelling from. Cardiff is in the Northern Hemisphere, so the seasons fall during these months:
| Season | Months |
|---|---|
| Summer | June to August |
| Autumn/fall | September to November |
| Winter | December to February |
| Spring | March to May |
Average temperatures in Cardiff
If the temperature is a big factor for you to help you decide when to visit, the chart below shows the average minimum and maximum temperatures in Cardiff for each month side-by-side so you can easily see the difference in weather throughout the year. To see the temperatures in both Celsius (°C) and Fahrenheit (°F), hover or tap the shaded boxes on the graph.
Cardiff climate by month
If you already have a rough idea about which months you might want to travel, the section below shows a detailed breakdown of the climate in Cardiff for each month so you can see if it all suits your wants and needs. Scroll down, or use the quick menu below to jump to your preferred month.
Jump to:
Cardiff in January
- Average temperature: 6℃ (42℉)
- Average high temperature: 8℃ (46℉)
- Average low temperature: 4℃ (39℉)
- Average humidity: 85%
- Average sunny days: 15 days
- Average rainfall: 16mm (1") over 11 days
- Average snow days: 1 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Cardiff in January, make sure you pack a thick snow/winter jacket, thermals and some extra layers as it's always very cold.
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Cardiff in February
- Average temperature: 6℃ (43℉)
- Average high temperature: 8℃ (46℉)
- Average low temperature: 4℃ (39℉)
- Average humidity: 83%
- Average sunny days: 15 days
- Average rainfall: 22mm (1") over 9 days
- Average snow days: 1 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Cardiff in February, make sure you pack a thick snow/winter jacket, thermals and some extra layers as it's always very cold.
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Cardiff in March
- Average temperature: 7℃ (45℉)
- Average high temperature: 10℃ (50℉)
- Average low temperature: 4℃ (40℉)
- Average humidity: 82%
- Average sunny days: 19 days
- Average rainfall: 17mm (1") over 10 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Cardiff in March, make sure you pack a thick snow/winter jacket, thermals and some extra layers as it's always very cold.
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Cardiff in April
- Average temperature: 9℃ (49℉)
- Average high temperature: 12℃ (54℉)
- Average low temperature: 6℃ (43℉)
- Average humidity: 81%
- Average sunny days: 19 days
- Average rainfall: 12mm (0") over 9 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Cardiff in April, make sure you pack a warm jacket or coat.
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Cardiff in May
- Average temperature: 12℃ (53℉)
- Average high temperature: 15℃ (58℉)
- Average low temperature: 8℃ (47℉)
- Average humidity: 81%
- Average sunny days: 18 days
- Average rainfall: 15mm (1") over 10 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Cardiff in May, make sure you pack a warm jacket or coat.
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Cardiff in June
- Average temperature: 14℃ (58℉)
- Average high temperature: 17℃ (63℉)
- Average low temperature: 11℃ (52℉)
- Average humidity: 84%
- Average sunny days: 17 days
- Average rainfall: 16mm (1") over 9 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Cardiff in June, make sure you pack a warm jacket or coat.
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Cardiff in July
- Average temperature: 16℃ (61℉)
- Average high temperature: 19℃ (66℉)
- Average low temperature: 13℃ (56℉)
- Average humidity: 83%
- Average sunny days: 16 days
- Average rainfall: 13mm (1") over 11 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Cardiff in July, make sure you pack a light jumper or hoodie.
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Cardiff in August
- Average temperature: 16℃ (61℉)
- Average high temperature: 19℃ (65℉)
- Average low temperature: 13℃ (56℉)
- Average humidity: 83%
- Average sunny days: 15 days
- Average rainfall: 22mm (1") over 12 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Cardiff in August, make sure you pack a light jumper or hoodie.
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Cardiff in September
- Average temperature: 14℃ (58℉)
- Average high temperature: 17℃ (63℉)
- Average low temperature: 11℃ (53℉)
- Average humidity: 83%
- Average sunny days: 16 days
- Average rainfall: 17mm (1") over 10 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Cardiff in September, make sure you pack a warm jacket or coat.
Cardiff in October
- Average temperature: 12℃ (54℉)
- Average high temperature: 14℃ (58℉)
- Average low temperature: 10℃ (50℉)
- Average humidity: 85%
- Average sunny days: 16 days
- Average rainfall: 26mm (1") over 11 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Cardiff in October, make sure you pack a warm jacket or coat.
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Cardiff in November
- Average temperature: 9℃ (48℉)
- Average high temperature: 10℃ (51℉)
- Average low temperature: 7℃ (45℉)
- Average humidity: 85%
- Average sunny days: 14 days
- Average rainfall: 31mm (1") over 13 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Cardiff in November, make sure you pack a warm jacket or coat.
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Cardiff in December
- Average temperature: 7℃ (45℉)
- Average high temperature: 9℃ (47℉)
- Average low temperature: 5℃ (41℉)
- Average humidity: 86%
- Average sunny days: 15 days
- Average rainfall: 27mm (1") over 12 days
- Average snow days: 1 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Cardiff in December, make sure you pack a warm jacket or coat.
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