September weather forecastKillyleagh, United Kingdom
September
Weather in September
September, the first month of the autumn in Killyleagh, is still a mild month, with temperature in the range of an average high of 15°C (59°F) and an average low of 12.3°C (54.1°F).Temperature
The introduction of September sees an average high-temperature of a mild 15°C (59°F), hardly deviating from August. The nights of September cool down to an average low of 12.3°C (54.1°F), subtly lower than daytime highs.Humidity
In Killyleagh, United Kingdom, the average relative humidity in September is 83%.Rainfall
In Killyleagh, in September, during 10.8 rainfall days, 27mm (1.06") of precipitation is typically accumulated. In Killyleagh, during the entire year, the rain falls for 167.4 days and collects up to 395mm (15.55") of precipitation.Snowfall
April through October are months without snowfall.Daylight
In September, the average length of the day in Killyleagh is 12h and 42min.On the first day of September, sunrise is at 6:31 am and sunset at 8:13 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 7:00 pm BST.
Sunshine
In Killyleagh, the average sunshine in September is 6.9h.UV index
May through September, with an average maximum UV index of 4, are months with the highest UV index in Killyleagh. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for average individuals.Note: In September, the average maximum UV index of 4 translates into the following recommendations:
Take necessary precautions - Suggestions to elude sunburn are provided. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Killyleagh, United Kingdom
- Average high temperature in September: 15°C
The warmest month (with the highest average high temperature) is August (16.3°C).
The month with the lowest average high temperature is February (7.5°C).
- Average low temperature in September: 12.3°C
The month with the highest average low temperature is August (13.2°C).
The coldest month (with the lowest average low temperature) is February (4.9°C).
Average pressure in September
Killyleagh, United Kingdom
- Average pressure in September: 1014.6mbar
The month with the highest atmospheric pressure is May (1015.7mbar).
The month with the lowest atmospheric pressure is November (1007.7mbar).
Average wind speed in September
Killyleagh, United Kingdom
- Average wind speed in September: 22.3km/h
The windiest month (with the highest average wind speed) is December (28.9km/h).
The calmest month (with the lowest average wind speed) is June (17.3km/h).
Average humidity in September
Killyleagh, United Kingdom
- Average humidity in September: 83%
The months with the highest relative humidity are July and August (85%).
The months with the lowest relative humidity are March, April and November (81%).
Average rainfall in September
Killyleagh, United Kingdom
- Average rainfall in September: 27mm
The wettest month (with the highest rainfall) is November (52mm).
The driest month (with the least rainfall) is May (20mm).
Average rainfall days in September
Killyleagh, United Kingdom
- Average rainfall days in September: 10.8 days
The month with the highest number of rainy days is July (17.9 days).
The month with the least rainy days is September (10.8 days).
Average snowfall in September
Killyleagh, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is December (8mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in September
Killyleagh, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1.6 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
Killyleagh, United Kingdom
- Average daylight in September: 12h and 42min
The month with the longest days is June (Average daylight: 17h and 6min).
The month with the shortest days is December (Average daylight: 7h and 24min).
- Average sunshine in September: 6h and 54min
The months with the most sunshine are May and June (Average sunshine: 7h and 54min).
The months with the least sunshine are January, February and November (Average sunshine: 4h and 6min).
Average sunshine days in September
Killyleagh, United Kingdom
- Average sunshine days in September: 16.2 days
The month with the most sunshine days is September (16.2 days).
The month with the least sunshine days is August (9.5 days).
Average UV index in September
Killyleagh, 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, March and December (UV index 2).
Average cloud cover in September
Killyleagh, United Kingdom
- Average cloud cover in September: 51
The month with the most cloud cover is January (Cloud cover 59).
The months with the least cloud cover are April and May (Cloud cover 49).
Average visibility in September
Killyleagh, 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).
