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
Stenness's weather, upon September's arrival, documents an average high-temperature of a still moderate 13.2°C (55.8°F), nearly identical to the prior month. During the nights of September, Stenness records an average low-temperature of 11.7°C (53.1°F), reflecting a modest decrease from daytime highs.Humidity
In September, the average relative humidity in Stenness is 83%.Rainfall
In Stenness, in September, it is raining for 18.9 days, with typically 45mm (1.77") of accumulated precipitation. In Stenness, 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.Daylight
The average length of the day in September in Stenness is 12h and 49min.On the first day of the month, sunrise is at 6:11 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
The average sunshine in September in Stenness, United Kingdom, is 6.1h.UV index
The months with the highest UV index in Stenness are June, July and September, with an average maximum UV index of 4. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for average individuals.Note: A daily high UV index of 4 in September leads to these guidelines:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures in Stenness?
What is the average humidity in September in Stenness?
How much does it rain in Stenness in September?
When it does not snow in Stenness?
What is the average length of the day in September in Stenness?
When are sunrise and sunset in September in Stenness?
How many hours of sunshine does Stenness have in September?
What is the month with the highest UV index in Stenness?
What is the UV index intensity in September in Stenness?
Average temperature in September
Stenness, 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
Stenness, 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
Stenness, 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
Stenness, 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
Stenness, 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
Stenness, 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
Stenness, 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
Stenness, 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
Stenness, United Kingdom
- Average daylight in September: 12h and 5min
The month with the longest days is June (Average daylight: 18h and 24min).
The month with the shortest days is December (Average daylight: 6h and 18min).
- Average sunshine in September: 6h and 1min
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
Stenness, 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
Stenness, 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
Stenness, 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
Stenness, 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).
