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WalesThe weather in September in Llanelli
It's cool to moderate in September in Llanelli 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.
Looking for great weather? September is a good time to be in Llanelli. The temperatures are nice, and there’s not too much rain.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in September for Llanelli, Wales. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
Temperature records
With 26°C in 2023, Llanelli 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 5°C to a highest value of 21°C.
Rainfall amount
In September, there is an average of 76 mm of precipitation, spread over 11 days. The wind speed is around 5 Bft, mostly coming from the Southwest.
Daily weather in September for Llanelli
Click on any day in September to get detailed info about the usual weather on that day in Llanelli. Check out the historical temperatures and precipitation over the past 10 years on this day.
September weather comparison
| Llanelli | New York | |
|---|---|---|
| Average temperature | 18°C | 27°C |
| Max. temperature | 20°C | 31°C |
| Min. temperature | 12°C | -5°C |
| Total precipitation | 76 mm | 57 mm |
| Rainy days | 11 days | 9 days |
Start of September
The month of September starts in Llanelli with mild temps, averaging around 20°C during the day and nights around 15°C.
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 Llanelli 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.
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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.
Check out the climate of Llanelli for all months and discover the best travel time
Temperature charts
These charts show the average temperatures in September in Llanelli, Wales. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in September in Llanelli
Temperature in September in Llanelli over the years
Precipitation charts
These charts show the average amount of precipitation in September in Llanelli, Wales. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Daily Precipitation in September in Llanelli
Total precipitation in September in Llanelli over the years
Daily UV index in September in Llanelli
This chart shows the average daily UV index in September in Llanelli, 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.
Weather experiences in September in Llanelli
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Average weather in Llanelli by month
Click on a month below to see detailed weather info for Llanelli. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.