Cardiff, United Kingdom - Weather and Climate
The climate in Cardiff, Wales, United Kingdom, is marked by big temperature swings throughout the year.
Temperatures range from pleasant during the warmest months
to cold in the cooler months.
It also has a relatively rainy climate with high levels of precipitation.
Now, let’s break down all the climate details for a clearer picture.
Average maximum day and minimum night temperature
In Cardiff, temperatures differ significantly between summer and winter months. On average, daytime temperatures range from a pleasant 20°C in August to a chilly 9°C in February.
Nighttime temperatures can drop, with average lows reaching 4°C in February.Check out our detailed temperature page for more information.
Temperature ranges by month
Precipitation and rainy days
Cardiff experiences significant rainfall throughout the year, averaging 1138 mm of precipitation annually. The wettest period in Cardiff occurs in December, which receives around 119 mm of precipitation. During the driest month, March, Cardiff experiences moderate rainfall, totaling approximately 76 mm. The consistent precipitation levels throughout the year contribute to a relatively stable climate.
The mean monthly precipitation over the year, including rain, hail and snow
The average number of days each month with precipitation
Sunshine over the year
In Cardiff, summer days are longer and more sunny, with daily sunshine hours peaking at 6.7 hours in July. As the darker season arrives, the brightness of the sun becomes less. December sees a soft sun for only 1.6 hours per average day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Average water temperature
The mean water temperature over the year ranges from 7°C in February to 16°C in August.
Water temperature over the year
Average monthly humidity
The city experiences its highest humidity in January, reaching 89%. In June, the humidity drops to its lowest level at 73%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Average wind speed
The mean wind speed over the year ranges from 4 m/s in May, June, July, August and September to 5 m/s in January, February, March, April, October, November and December.
The mean monthly wind speed over the year (meters per second)
Forecast for Cardiff
Select a Month of Interest
Check the conditions for any month of the year.
The best time of year to visit Cardiff in the United Kingdom
During the months of July and August you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.Other facts from our historical weather data:
August has an average maximum temperature of 20°C and is the warmest month of the year.
The coldest month is February with an average maximum temperature of 9°C.
December tops the wettest month list with 119 mm of rainfall.
March is the driest month with 76 mm of precipitation.
July is the sunniest month with an average of 202 hours of sunshine.
No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.
