ClimateForecastSeptemberOctober >>

Weather in September in Wales

Thinking about venturing to Wales this September and curious about the weather conditions to expect? This page holds all the key information you seek, responding to your question:

What is the weather like in Wales in September?

Wales is a region in the United Kingdom. September in Wales generally has pleasant temperatures, with precipitation levels ranging from moderate to high. September is a summer month.

Temperatures

You can expect pleasant maximum daytime temperatures of around 18°C and nighttime temperatures around 12°C in Cardiff.

Precipitation

In September, precipitation varies across different areas. From moderate rainfall in Cardiff with an average of 90 mm to high rainfall in Swansea with 103 mm.

Average sunshine

Cardiff enjoys a balanced 149 hours of sunlight. Ensuring it's neither too overcast nor too sunny.

For a closer look at September's conditions in Wales, see the map below. For a more detailed look at Wales's yearly weather, check out our Wales climate page.

Where to go in Wales in September

Find more information for the most popular destinations in the Wales on the map below. Click on a destination dot for more detailes.

Map not visible? Whoops sorry! Please refresh the page.
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).

Popular destinations

What is the weather like in September for the 2 most popular destinations in Wales?

Cardiff

In September Cardiff generally has pleasant temperatures with maximum daytime temperatures around 18°C, minimum nighttime temperatures around 12°C and moderate monthly rainfall. So on average the conditions are pleasant that month.

Cardiff
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
sun hoursMonthly sun hours sun hoursSun hours
precipitationMonthly rainfall precipitationRainfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
<<   August August
<<  
20°C 
14°C 
184 hours 
98 mm 
15 days 
18°C 
12°C 
149 hours 
90 mm 
16 days 
October   >> October
>>  
15°C 
10°C 
102 hours 
119 mm 
18 days 
Climate in Cardiff

Swansea

In September Swansea generally has pleasant temperatures with maximum daytime temperatures around 18°C, minimum nighttime temperatures around 12°C and high monthly rainfall. So on average the conditions are tolerable that month.

Swansea
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
sun hoursMonthly sun hours sun hoursSun hours
precipitationMonthly rainfall precipitationRainfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
<<   August August
<<  
20°C 
14°C 
184 hours 
109 mm 
16 days 
18°C 
12°C 
149 hours 
103 mm 
16 days 
October   >> October
>>  
15°C 
9°C 
102 hours 
141 mm 
19 days 
Climate in Swansea

Is your destination not in the list? Have a look at other destinations in Wales, in the United Kingdom.

Is September the best time to visit Wales?

Given the typically pleasant weather conditions in Cardiff, September might be a good time to visit Wales. It's worth noting that weather conditions might differ depending on the location you visit.

On average, the best time to visit Wales is in July and August with generally perfect weather in Cardiff. On the other hand, the weather in January, February, November and December tend to be poor.

Interested in more climate information?

We have much more information about the climate in Wales. Interested in the weather conditions in a specific month? Select the month below.

  • January      
  • February      
  • March      
  • April      
  • May      
  • June      
  • July      
  • August      
  • September      
  • October      
  • November      
  • December      
  • Weather and climate has detailed information for every country in the world. Are you going to the United Kingdom? Get detailed 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.