Cardiff weather in September (Wales, United Kingdom)

Is Cardiff a good destination in September, weather-wise? Curious if the timing is right for your trip? Our page offers an in-depth look at the monthly weather conditions.

Temperatures

September in Cardiff generally includes pleasant temperatures and moderate rainfall. The summer season is characteristic of September. During the daylight hours, temperatures often reach 18°C. After dark they usually decrease to around 12°C.

Precipitation

Cardiff in September usually receives moderate rainfall, averaging around 90 mm for the month. Historically, the month has about 16 days of rain.

Average sunshine

The area enjoys a moderate level of sunlight, with around 149 hours. It's a good balance between sunny and cloudy days.

If you prefer dry days with pleasant temperatures, July and August typically offer the best circumstances. While January, February, November and December tend to showcase less optimal conditions.

For an in-depth look at the yearly conditions, visit our specialized Cardiff climate page with graphs.

 

Cardiff, monthly averages in September

Min Temperature 12°C  

Max Temperature 18°C  

Water Temperature 15°C  

Chance of Rain 52%  

Precipitation 90 mm  

Rainy days 16 days  

Humidity 81%  

Windspeed 14 km/h  

Sunshine 149 hours  

Percentage Sunshine 37%  

Where to go in the United Kingdom in September

Find out more about the weather in the United Kingdom and which places have the best travel conditions in this month.

Weather conditions Weather

Temperatures

Precipitation

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Legend perfect weather pleasant tolerable unpleasant poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C and 29°C and not too much precipitation (less than 90 mm a month).

So, what should you wear in this month?

For visitors traveling to Cardiff, we recommend wearing layers. So maybe a skirt, t-shirt, shorts for during the day and jeans and a warm jacket for some days and evenings. Bring a rain jacket in case it rains during your stay. Plan on layering your clothes. With a water temperature of around 15°C there is no need to bring your swimwear.

What To Do

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

6/10

Cycling

9/10

Walking

9/10

Camping

8/10

Outdoor sports

9/10

Interested in more climate information?

This site provides you with all the information you need about the climate in Cardiff.

Our site offers climate and forecast data for every country in the world. Are you going to the United Kingdom? On this website you can find historical weather averages for many cities in the United Kingdom. Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.