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 sea temperature 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
Weather in September
Temperature
The transition into September in Alftanes, Iceland, is accompanied by a slight temperature decrease, with the average high-temperature shifting from a fresh 12.8°C (55°F) in August to a frosty 9.6°C (49.3°F). A minor drop in temperature is observed from daytime highs in Alftanes during the nights of September, averaging 6.2°C (43.2°F).Humidity
The months with the highest humidity in Alftanes are January, February and September, with an average relative humidity of 82%.Rainfall
In September, in Alftanes, Iceland, the rain falls for 17.8 days. Throughout September, 40mm (1.57") of precipitation is accumulated. Throughout the year, in Alftanes, there are 166.2 rainfall days, and 416mm (16.38") of precipitation is accumulated.Snowfall
In Alftanes, snow does not fall in June through September.Sea temperature
In September, the average sea temperature is 9.7°C (49.5°F).Note: Navigating the 9.7°C (49.5°F) at 13°C (55.4°F) is no joy, and temperatures less than 10°C (50°F) can threaten breathing and cause a chilling shock, gauging personal stamina.
Daylight
In Alftanes, the average length of the day in September is 13h and 1min.On the first day of September in Alftanes, sunrise is at 06:12 and sunset at 20:43. On the last day of the month, sunrise is at 07:35 and sunset at 18:59 GMT.
Sunshine
The average sunshine in September is 4.5h.UV index
In September, the average daily maximum UV index in Alftanes is 2. A UV Index estimate of 2, and below, represents a minimal health hazard from exposure to the Sun's UV radiation for average individuals.Note: The daily high UV index of 2 in September translates into this advice:
Most individuals face no major issues with lengthy exposure to the sun, but children, infants, and individuals with fair skin always require protection. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.
Frequently asked questions
What is the usual temperature for Alftanes in September?
What is the most humid month in Alftanes?
What is the average humidity in September in Alftanes?
How many days does it rain in September in Alftanes?
When it does not snow in Alftanes?
Does it snow in Alftanes in September?
What is the sea water temperature in September in Alftanes?
What is the average length of the day in September in Alftanes?
When are sunrise and sunset in September in Alftanes?
How many hours of sunshine does Alftanes have in September?
What is the UV index intensity in September in Alftanes?
Average temperature in September
Alftanes, 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
Alftanes, 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
Alftanes, 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
Alftanes, 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
Alftanes, 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
Alftanes, 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
Alftanes, 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
Alftanes, 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 sea temperature in September
Alftanes, Iceland
- Average sea temperature in September: 9.7°C
The best months for swimming (with the highest average sea temperature) are July and August (11.3°C).
The coldest month (with the lowest average sea temperature) is March (4.3°C).
Average daylight in September /
Average sunshine in September
Alftanes, Iceland
- Average daylight in September: 13h and 0min
The month with the longest days is June (Average daylight: 20h and 48min).
The month with the shortest days is December (Average daylight: 4h and 24min).
- Average sunshine in September: 4h and 3min
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
Alftanes, 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
Alftanes, 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
Alftanes, 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
Alftanes, 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).
Alftanes, Iceland
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