September weather forecastLyness, United Kingdom
September
Weather in September
September, the first month of the autumn in Lyness, is still a mild month, with an average temperature ranging between min 11.7°C (53.1°F) and max 13.2°C (55.8°F).Temperature
Lyness's average high-temperature in September is a still moderate 13.2°C (55.8°F), indicating a subtle variation from August. Lyness's nighttime temperature in September shows a minor descent, with a steady average of 11.7°C (53.1°F).Humidity
The average relative humidity in September in Lyness is 83%.Rainfall
In Lyness, in September, during 18.9 rainfall days, 45mm (1.77") of precipitation is typically accumulated. In Lyness, during the entire year, the rain falls for 233.4 days and collects up to 572mm (22.52") of precipitation.Snowfall
May through October are months without snowfall in Lyness.Daylight
The average length of the day in September in Lyness is 12h and 49min.On the first day of the month, sunrise is at 6:12 am and sunset at 8:13 pm. On the last day of September, sunrise is at 7:16 am and sunset at 6:48 pm BST.
Sunshine
In Lyness, the average sunshine in September is 6.1h.UV index
June, July and September, with an average maximum UV index of 4, are months with the highest UV index in Lyness. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: A maximum UV index of 4 in September translates into the following recommendations:
Undertake protective steps - Preventing sun damage is advised. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. Always opt for UVA and UVB-resistant sunglasses on radiant days.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Lyness, United Kingdom
- Average high temperature in September: 13.2°C
The warmest month (with the highest average high temperature) is August (14.2°C).
The month with the lowest average high temperature is February (7°C).
- Average low temperature in September: 11.7°C
The month with the highest average low temperature is August (12.4°C).
The coldest month (with the lowest average low temperature) is February (5.5°C).
Average pressure in September
Lyness, United Kingdom
- Average pressure in September: 1010.7mbar
The months with the highest atmospheric pressure are May and June (1014.4mbar).
The month with the lowest atmospheric pressure is December (1003.7mbar).
Average wind speed in September
Lyness, United Kingdom
- Average wind speed in September: 29.6km/h
The windiest month (with the highest average wind speed) is January (38.7km/h).
The calmest months (with the lowest average wind speed) are June and July (22.5km/h).
Average humidity in September
Lyness, United Kingdom
- Average humidity in September: 83%
The month with the highest relative humidity is July (86%).
The months with the lowest relative humidity are January and December (75%).
Average rainfall in September
Lyness, United Kingdom
- Average rainfall in September: 45mm
The wettest months (with the highest rainfall) are January and December (60mm).
The driest month (with the least rainfall) is April (30mm).
Average rainfall days in September
Lyness, United Kingdom
- Average rainfall days in September: 18.9 days
The month with the highest number of rainy days is December (23.5 days).
The month with the least rainy days is June (15.5 days).
Average snowfall in September
Lyness, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is February (5mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in September
Lyness, United Kingdom
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are February and March (1.2 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
Lyness, United Kingdom
- Average daylight in September: 12h and 48min
The month with the longest days is June (Average daylight: 18h and 18min).
The month with the shortest days is December (Average daylight: 6h and 24min).
- Average sunshine in September: 6h and 6min
The month with the most sunshine is June (Average sunshine: 8h and 6min).
The month with the least sunshine is December (Average sunshine: 3h and 6min).
Average sunshine days in September
Lyness, United Kingdom
- Average sunshine days in September: 8.5 days
The month with the most sunshine days is May (11.4 days).
The month with the least sunshine days is December (4.8 days).
Average UV index in September
Lyness, United Kingdom
- Average UV index in September: 4
The months with the highest UV index are June, July 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
Lyness, United Kingdom
- Average cloud cover in September: 60
The months with the most cloud cover are January and March (Cloud cover 67).
The months with the least cloud cover are April and May (Cloud cover 56).
Average visibility in September
Lyness, United Kingdom
- Average visibility in September: 10km
The months with the highest visibility are February, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January and March (9km).
