September weather forecast
Swansea, United Kingdom

As September arrives, summer starts bidding adieu to Swansea, bringing a noticeable drop in temperature. The average sea temperature falls back to a mild 16.5°C (61.7°F), signaling the end of the swimming season. The decrease in daylight and sunshine hours insinuates the start of autumn. Nonetheless, the still warm temperatures and dry spell make September an excellent time for outdoor pursuits.

Temperature

Swansea greets September with an average high-temperature of a still comfortable 17.8°C (64°F), marking a slight deviation from the preceding month. In the month of September, Swansea experiences an average low-temperature of 12.4°C (54.3°F).

Rainfall

In September, in Swansea, the rain falls for 16 days. Throughout September, 77mm (3.03") of precipitation is accumulated. Throughout the year, in Swansea, United Kingdom, there are 201 rainfall days, and 999mm (39.33") of precipitation is accumulated.

Sea temperature

In Swansea, the average seawater temperature in September is 16.5°C (61.7°F).
Note: Most people do not find swimming enjoyable in water of 16.5°C (61.7°F). The task of controlling breathing becomes tougher as the temperature drops from 21°C (69.8°F) to 15°C (59°F).

Daylight

The average length of the day in September is 12h and 38min.
On the first day of the month, sunrise is at 6:29 am and sunset at 8:02 pm. On the last day of September, in Swansea, sunrise is at 7:15 am and sunset at 6:55 pm BST.

Sunshine

In Swansea, the average sunshine in September is 5h.

UV index

The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the average person.
Note: In September, the average maximum UV index of 4 translates into the following recommendations:
Take precautions - Protection against skin and eye damage is obliged. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. To cut down UV radiation exposure by about half, sport a wide-brim hat.