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
The advent of September denotes an average high-temperature of a still chilly 7.2°C (45°F), subtly different from August's 9.3°C (48.7°F). Nighttime temperatures record an average of 4.7°C (40.5°F) throughout September.Humidity
The months with the highest humidity are January, February, August through October, with an average relative humidity of 85%.Rainfall
In Flateyri, Iceland, in September, it is raining for 21.7 days, with typically 75mm (2.95") of accumulated precipitation. Throughout the year, in Flateyri, there are 169 rainfall days, and 830mm (32.68") of precipitation is accumulated.Snowfall
January through June, September through December are months with snowfall in Flateyri, Iceland. September is the first month it typically snows. Throughout September, in the average 1.7 snowfall days, it receives 12mm (0.47") of snow. In Flateyri, Iceland, during the entire year, snow falls for 95.9 days and aggregates up to 999mm (39.33") of snow.Daylight
The average length of the day in September is 13h and 6min.On the first day of September, sunrise is at 06:11 and sunset at 20:56. On the last day of the month, sunrise is at 07:43 and sunset at 19:03 GMT.
Sunshine
In Flateyri, the average sunshine in September is 4h.UV index
In Flateyri, the average daily maximum UV index in September is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV rays for average individuals.Note: In September, the maximum UV index of 2 transforms into these recommendations:
While extended sun exposure does not significantly affect most people, those with sensitive skin, children, and infants should always be protected. When the Sun is at its strongest around midday, find shade and limit exposure. During bright days, sunglasses that offer UVA and UVB defense are recommended. Foresee this! The reflection from snow can nearly double the intensity of UV radiation from the Sun.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Flateyri in September?
What are the most humid months in Flateyri?
What is the average humidity in September in Flateyri?
How many days does it rain in September in Flateyri?
When does it start to snow in Flateyri?
How many hours of daylight does Flateyri have in September?
When is the sunrise / sunset in September in Flateyri?
How long on average sun shines in September in Flateyri?
What is the UV index intensity in September in Flateyri?
Average temperature in September
Flateyri, Iceland
- Average high temperature in September: 7.2°C
The warmest month (with the highest average high temperature) is July (9.5°C).
The month with the lowest average high temperature is March (-0.2°C).
- Average low temperature in September: 4.7°C
The month with the highest average low temperature is July (6.8°C).
The coldest month (with the lowest average low temperature) is March (-3°C).
Average pressure in September
Flateyri, Iceland
- Average pressure in September: 1003.4mbar
The month with the highest atmospheric pressure is June (1014.8mbar).
The month with the lowest atmospheric pressure is January (997.4mbar).
Average wind speed in September
Flateyri, Iceland
- Average wind speed in September: 20.2km/h
The windiest month (with the highest average wind speed) is December (29.6km/h).
The calmest month (with the lowest average wind speed) is June (15.7km/h).
Average humidity in September
Flateyri, Iceland
- Average humidity in September: 85%
The months with the highest relative humidity are January, February, August, September and October (85%).
The months with the lowest relative humidity are May and June (82%).
Average rainfall in September
Flateyri, Iceland
- Average rainfall in September: 75mm
The wettest month (with the highest rainfall) is January (101mm).
The driest month (with the least rainfall) is June (34mm).
Average rainfall days in September
Flateyri, Iceland
- Average rainfall days in September: 21.7 days
The month with the highest number of rainy days is September (21.7 days).
The month with the least rainy days is February (8.5 days).
Average snowfall in September
Flateyri, Iceland
- Average snowfall in September: 12mm
The month with the highest snowfall is March (203mm).
The months with the least snowfall are July and August (0mm).
Average snowfall days in September
Flateyri, Iceland
- Average snowfall days in September: 1.7 days
The month with the highest number of snowfall days is March (18 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Flateyri, Iceland
- Average daylight in September: 13h and 1min
The month with the longest days is July (Average daylight: 21h and 0min).
The month with the shortest days is December (Average daylight: 3h and 6min).
- Average sunshine in September: 4h and 0min
The month with the most sunshine is August (Average sunshine: 6h and 30min).
The month with the least sunshine is June (Average sunshine: 0h and 24min).
Average sunshine days in September
Flateyri, Iceland
- Average sunshine days in September: 5.9 days
The month with the most sunshine days is June (13.9 days).
The month with the least sunshine days is March (3.5 days).
Average UV index in September
Flateyri, Iceland
- Average UV index in September: 2
The months with the highest UV index are June and July (UV index 3).
The months with the lowest UV index are January, February, March, October, November and December (UV index 1).
Average cloud cover in September
Flateyri, Iceland
- Average cloud cover in September: 70
The month with the most cloud cover is March (Cloud cover 79).
The month with the least cloud cover is June (Cloud cover 61).
Average visibility in September
Flateyri, Iceland
- Average visibility in September: 9km
The months with the highest visibility are May, June, July, August and September (9km).
The month with the lowest visibility is March (7km).
