September weather forecastÁlafoss, Iceland
September
Weather in September
The first month of the autumn, September, is also a frosty month in Álafoss, Iceland, with an average temperature fluctuating between 6.2°C (43.2°F) and 9.6°C (49.3°F).Temperature
September's arrival comes with a mild decrease in the average high-temperature, moving subtly from a fresh 12.8°C (55°F) in August to a frosty 9.6°C (49.3°F). Álafoss, in September, registers a nighttime average temperature of 6.2°C (43.2°F).Humidity
January, February and September, with an average relative humidity of 82%, are the most humid months in Álafoss.Rainfall
In Álafoss, in September, it is raining for 17.8 days, with typically 40mm (1.57") of accumulated precipitation. Throughout the year, in Álafoss, there are 166.2 rainfall days, and 416mm (16.38") of precipitation is accumulated.Snowfall
June through September are months without snowfall in Álafoss.Daylight
The average length of the day in September is 13h and 1min.On the first day of the month, sunrise is at 06:11 and sunset at 20:41. On the last day of September, sunrise is at 07:34 and sunset at 18:58 GMT.
Sunshine
In September, the average sunshine is 4.5h.UV index
In September, the average daily maximum UV index is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The average daily UV index of 2 in September transforms into the following instructions:
While sun exposure does not greatly affect most, individuals with fair skin, babies, and children always need vigilant safeguarding. Direct Sun exposure should be minimized especially during midday when radiation is most intense. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Álafoss, Iceland
- Average high temperature in September: 9.6°C
The warmest month (with the highest average high temperature) is July (13.5°C).
The month with the lowest average high temperature is December (1.3°C).
- Average low temperature in September: 6.2°C
The month with the highest average low temperature is July (9.1°C).
The coldest month (with the lowest average low temperature) is December (-2.4°C).
Average pressure in September
Álafoss, Iceland
- Average pressure in September: 1002.9mbar
The month with the highest atmospheric pressure is June (1013.8mbar).
The month with the lowest atmospheric pressure is January (996.6mbar).
Average wind speed in September
Álafoss, Iceland
- Average wind speed in September: 20.4km/h
The windiest month (with the highest average wind speed) is February (24.9km/h).
The calmest months (with the lowest average wind speed) are June and July (14.9km/h).
Average humidity in September
Álafoss, Iceland
- Average humidity in September: 82%
The months with the highest relative humidity are January, February and September (82%).
The month with the lowest relative humidity is May (75%).
Average rainfall in September
Álafoss, Iceland
- Average rainfall in September: 40mm
The wettest month (with the highest rainfall) is January (47mm).
The driest months (with the least rainfall) are June and July (25mm).
Average rainfall days in September
Álafoss, Iceland
- Average rainfall days in September: 17.8 days
The month with the highest number of rainy days is September (17.8 days).
The month with the least rainy days is December (9.7 days).
Average snowfall in September
Álafoss, Iceland
- Average snowfall in September: 0mm
The month with the highest snowfall is March (100mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Álafoss, Iceland
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is March (9.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Álafoss, Iceland
- Average daylight in September: 13h and 0min
The month with the longest days is June (Average daylight: 20h and 54min).
The month with the shortest days is December (Average daylight: 4h and 24min).
- Average sunshine in September: 4h and 30min
The month with the most sunshine is August (Average sunshine: 7h and 24min).
The month with the least sunshine is January (Average sunshine: 2h and 24min).
Average sunshine days in September
Álafoss, Iceland
- Average sunshine days in September: 8.8 days
The month with the most sunshine days is December (14.1 days).
The month with the least sunshine days is September (8.8 days).
Average UV index in September
Álafoss, Iceland
- Average UV index in September: 2
The month with the highest UV index is July (UV index 4).
The months with the lowest UV index are January, February and November (UV index 1).
Average cloud cover in September
Álafoss, Iceland
- Average cloud cover in September: 65
The months with the most cloud cover are March and April (Cloud cover 68).
The months with the least cloud cover are August and December (Cloud cover 60).
Average visibility in September
Álafoss, Iceland
- Average visibility in September: 9km
The month with the highest visibility is June (10km).
The months with the lowest visibility are January, February, March, April, May, July, August, September, October, November and December (9km).
