Swansea Weather in September

During September, Swansea experiences pleasant daytime temperatures of 18°C (64°F) and cooler nights around 12°C (54°F). As part of the summer season, expect quite a bit of rainfall. Around 103 mm (4.1 in) is typical.

Rainfall in Swansea in September

You can expect rain on around 16 days based on historical patterns, with 103 mm (4.1 in) average for the month. Wet weather is a regular and significant part of this month. Frequent days of rain combined with high totals means proper waterproofs are worth packing.

Temperature in Swansea in September

September in Swansea brings typical temperatures with highs around 18°C (64°F) and lows of 12°C (54°F). September is in the summer season. Even when the weather is stable, mornings and evenings can still feel distinctly cool. At 12°C (54°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping.

Sunshine in Swansea in September

With about 149 hours of sunshine, the area enjoys a nice balance of sun and overcast, creating a pleasant environment.

Our weather planner can help you find worldwide destinations with pleasant weather during this period. July typically offers the best weather for Swansea.

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Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United Kingdom, check out our Swansea's climate page.

Swansea Temperature in September

Min Temperature 12°C (54°F)  

Max Temperature 18°C (64°F)  

Chance of Rain 53%  

Precipitation 103 mm (4.1 in)  

Rainy days 16 days  

Humidity 81% *  

Sunshine 149 hours *  

Percentage Sunshine 37% *  

* Data from: Cardiff, the United Kingdom (48 KM, 29 Miles).

What to Wear in Swansea in September

Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Prepare for significant rainfall with proper waterproof clothing and shoes. Sunglasses could come in handy during the sunnier parts of your trip.

What To Do in Swansea in September

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

Swimming

6/10

Cycling

9/10

Walking

9/10

Camping

6/10

Outdoor sports

9/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United Kingdom, check out our Swansea's climate page.

More climate data for Swansea

Temperature Rainfall Sunshine Humidity

See the full Swansea climate overview or explore weather in the United Kingdom.