Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
September
Weather in September
Temperature
The transition into September marks the average high-temperature at a still refreshing 15.5°C (59.9°F), differing minimally from August's 16.6°C (61.9°F). An average temperature of 12.7°C (54.9°F) is logged during the nights of September in Llanfflewyn, United Kingdom, a small step down from daytime highs.Humidity
In Llanfflewyn, the average relative humidity in September is 83%.Rainfall
In Llanfflewyn, during September, the rain falls for 15.4 days and regularly aggregates up to 31mm (1.22") of precipitation. In Llanfflewyn, United Kingdom, during the entire year, the rain falls for 196.7 days and collects up to 430mm (16.93") of precipitation.Snowfall
April through October are months without snowfall.Daylight
In Llanfflewyn, United Kingdom, the average length of the day in September is 12h and 41min.On the first day of September in Llanfflewyn, sunrise is at 6:28 am and sunset at 8:07 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 6:56 pm BST.
Sunshine
In Llanfflewyn, United Kingdom, the average sunshine in September is 6.8h.UV index
The months with the highest UV index in Llanfflewyn are May through September, with an average maximum UV index of 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: A daily high UV index of 4 in September leads to these guidelines:
Take precautions - Protection against sunburn is recommended. The Sun's radiation is especially intense around midday; try to stay in shade during this period. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Llanfflewyn in September?
What is the average humidity in September in Llanfflewyn?
How much does it rain in Llanfflewyn in September?
When it does not snow in Llanfflewyn?
What is the average length of the day in September in Llanfflewyn?
What time are sunrise and sunset in September in Llanfflewyn?
How many hours of sunshine does Llanfflewyn have in September?
What are the months with the highest UV index in Llanfflewyn?
What is the UV index reading in September in Llanfflewyn?
Average temperature in September
Llanfflewyn, United Kingdom
- Average high temperature in September: 15.5°C
The warmest month (with the highest average high temperature) is August (16.6°C).
The month with the lowest average high temperature is February (7.3°C).
- Average low temperature in September: 12.7°C
The month with the highest average low temperature is August (14.1°C).
The coldest month (with the lowest average low temperature) is February (5°C).
Average pressure in September
Llanfflewyn, United Kingdom
- Average pressure in September: 1015.5mbar
The month with the highest atmospheric pressure is May (1016.1mbar).
The month with the lowest atmospheric pressure is November (1008.7mbar).
Average wind speed in September
Llanfflewyn, United Kingdom
- Average wind speed in September: 21.4km/h
The windiest month (with the highest average wind speed) is December (28.6km/h).
The calmest month (with the lowest average wind speed) is June (17.2km/h).
Average humidity in September
Llanfflewyn, United Kingdom
- Average humidity in September: 83%
The months with the highest relative humidity are July and August (84%).
The months with the lowest relative humidity are April and November (80%).
Average rainfall in September
Llanfflewyn, United Kingdom
- Average rainfall in September: 31mm
The wettest month (with the highest rainfall) is November (51mm).
The driest months (with the least rainfall) are April and May (21mm).
Average rainfall days in September
Llanfflewyn, United Kingdom
- Average rainfall days in September: 15.4 days
The month with the highest number of rainy days is August (19.9 days).
The month with the least rainy days is June (13.2 days).
Average snowfall in September
Llanfflewyn, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is January (10mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in September
Llanfflewyn, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.1 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Llanfflewyn, United Kingdom
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 54min).
The month with the shortest days is December (Average daylight: 7h and 36min).
- Average sunshine in September: 6h and 5min
The month with the most sunshine is May (Average sunshine: 8h and 24min).
The month with the least sunshine is December (Average sunshine: 3h and 42min).
Average sunshine days in September
Llanfflewyn, United Kingdom
- Average sunshine days in September: 11 days
The month with the most sunshine days is June (14.7 days).
The month with the least sunshine days is December (6.2 days).
Average UV index in September
Llanfflewyn, United Kingdom
- Average UV index in September: 4
The months with the highest UV index are May, June, July, August and September (UV index 4).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Llanfflewyn, United Kingdom
- Average cloud cover in September: 53
The month with the most cloud cover is December (Cloud cover 65).
The month with the least cloud cover is May (Cloud cover 46).
Average visibility in September
Llanfflewyn, United Kingdom
- Average visibility in September: 10km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
