WalesAverage weather for Swansea in September
It's cool to moderate in September in Swansea with an average temperature of 18°C. Temperatures this month range from a low of 17°C to a high of 20°C. At night, you can expect temperatures between 12°C and 15°C.
Start of September
The month of September starts in Swansea with mild temps, averaging around 20°C during the day and nights around 15°C. A few showers might pop up early in the month, but overall, it’ll stay mostly sunny and dry.
Mid September
By mid-September, daytime temps drop to around 19°C, with nights around 14°C. There’s a chance of some showers during this time, but plenty of dry and sunny days too.
End of September
By the end of September, the average daytime temperature in Swansea is around 18°C, while nighttime temps are about 13°C. Expect regular precipitation, but if you’re lucky, you’ll also get some dry and sunny days.
In September, there is an average of 78 mm of precipitation, spread over 12 days. The wind speed is around 5 Bft, mostly coming from the Southwest.
Swansea in September |
New York | ||
|---|---|---|---|
 Average temperature |
18°C | 27°C | |
 Max. temperature |
20°C | 31°C | |
| Min. temperature |
17°C | -5°C | |
 Total precipitation |
78 mm | 57 mm | |
| Rainy days |
12 days | 9 days | |
August
UV index
The UV index is a maximum of 6 this month. That's a moderate to high value on the intensity scale of 1 to 11. Unprotected skin can burn within 15-25 minutes.
Is September a good time to visit Swansea?
Looking for great weather? September is a good time to be in Swansea. The temperatures are nice, and there’s not too much rain.
Temperature records
With 27°C in 2023, Swansea reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 12°C in 2018. The extreme nighttime temperatures ranged from a lowest recorded value of 6°C to a highest value of 21°C.
Check out the climate of Swansea for all months and discover the best travel time
Daily Temperature in September in Swansea
This chart shows the average daily high and low temperatures in September for Swansea, in degrees Celsius. The red line represents the highs, and the blue line shows the lows. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, provide the average temperatures for this month.
Daily Precipitation in September in Swansea
The chart below shows the average daily precipitation in September for Swansea, measured in millimeters over the past few years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are listed at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that it rained more often. But remember, it’s just an average, and every day can be different. Based on historical weather data for September, you can expect about 12 days of precipitation in Swansea.
Daily UV index in September in Swansea
This chart shows the average daily UV index in September in Swansea, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Temperature in September in Swansea over the years
This chart shows the average temperature in September in Swansea, measured in degrees Celsius, over the past few years.
Total precipitation in September in Swansea over the years
This chart shows the average precipitation in September in Swansea, measured in millimeters over the past years. Precipitation is always measured as water, whether it’s snow or hail.
Daily weather in September for Swansea
Click on any day in September to get detailed info about the usual weather on that day in Swansea. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in September in Swansea
Have you been to Swansea in September?
Share your weather experience in September in Swansea.
Average weather in Swansea by month
Click on a month below to see detailed weather info for Swansea. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
