September weather forecastLlanfechell, United Kingdom
September
Weather in September
September, the first month of the autumn in Llanfechell, is also a moderate month, with an average temperature ranging between max 15.5°C (59.9°F) and min 12.7°C (54.9°F).Temperature
Llanfechell, United Kingdom, measures an average high-temperature of a moderate 15.5°C (59.9°F) in September, nearly consistent with the preceding month. Llanfechell, during September nights, records a temperature marginally cooler than the daytime average, at a fresh 12.7°C (54.9°F).Humidity
In Llanfechell, the average relative humidity in September is 83%.Rainfall
In September, in Llanfechell, the rain falls for 15.4 days. Throughout September, 31mm (1.22") of precipitation is accumulated. In Llanfechell, during the entire year, the rain falls for 196.7 days and collects up to 430mm (16.93") of precipitation.Snowfall
In Llanfechell, snow does not fall in April through October.Daylight
In Llanfechell, the average length of the day in September is 12h and 41min.On the first day of September in Llanfechell, United Kingdom, 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 September, the average sunshine in Llanfechell is 6.8h.UV index
May through September, with an average maximum UV index of 4, are months with the highest UV index in Llanfechell. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for average individuals.Note: In September, the maximum UV index of 4 suggests these recommendations:
Undertake protective steps - Preventing sun damage is advised. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Llanfechell, 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
Llanfechell, 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
Llanfechell, 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
Llanfechell, 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
Llanfechell, 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
Llanfechell, 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
Llanfechell, 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
Llanfechell, 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
Llanfechell, United Kingdom
- Average daylight in September: 12h and 42min
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 48min
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
Llanfechell, 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
Llanfechell, 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
Llanfechell, 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
Llanfechell, 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).
