September weather forecastKirkwall, United Kingdom
September
Weather in September
The first month of the autumn, September, is still a refreshing month in Kirkwall, United Kingdom, with an average temperature ranging between max 13.2°C (55.8°F) and min 11.7°C (53.1°F).Temperature
The advent of September signifies a minor shift to an average high-temperature of a still moderate 13.2°C (55.8°F), aligning closely with August. September introduces a small decrease to a nighttime average of 11.7°C (53.1°F).Humidity
In September, the average relative humidity in Kirkwall, United Kingdom, is 83%.Rainfall
In Kirkwall, United Kingdom, in September, during 18.9 rainfall days, 45mm (1.77") of precipitation is typically accumulated. In Kirkwall, 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 Kirkwall.Sea temperature
In Kirkwall, the average seawater temperature in September is 12.8°C (55°F).Note: Swimming in 12.8°C (55°F) poses a severe threat. Even short exposure to 13°C (55.4°F) is chilling, and going below 10°C (50°F) can cause breathing irregularities and intense cold shock, based on one's stamina.
Daylight
In Kirkwall, the average length of the day in September is 12h and 50min.On the first day of the month, sunrise is at 6:10 am and sunset at 8:12 pm. On the last day of September, sunrise is at 7:15 am and sunset at 6:47 pm BST.
Sunshine
The average sunshine in September in Kirkwall is 6.1h.UV index
The months with the highest UV index are June, July and September, with an average maximum UV index of 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for average individuals.Note: A maximum UV index of 4 in September translates into the following recommendations:
Heed the precautions - Protecting the skin and eyes from damage is compulsory. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. 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
Kirkwall, 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
Kirkwall, 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
Kirkwall, 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
Kirkwall, 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
Kirkwall, 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
Kirkwall, 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
Kirkwall, 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
Kirkwall, 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 sea temperature in September
Kirkwall, United Kingdom
- Average sea temperature in September: 12.8°C
The best month for swimming (with the highest average sea temperature) is August (13.3°C).
The coldest month (with the lowest average sea temperature) is March (7.1°C).
Average daylight in September /
Average sunshine in September
Kirkwall, United Kingdom
- Average daylight in September: 12h and 48min
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 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
Kirkwall, 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
Kirkwall, 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
Kirkwall, 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
Kirkwall, 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).
