September weather forecastAkranes, Iceland

September

Weather in September

The arrival of September in Akranes, Iceland, sees the onset of fall, as temperatures continue to drop, and daylight hours shorten. Despite the decreasing temperatures, there is a hike in rainfall reaching 40mm (1.57"), which breathes life into the autumn foliage. The landscape starts to change, with leaves turning into warm and rich tones. The relatively calm weather, combined with the changing colours of the environment, results in beautiful and vivid landscapes. This comfortable weather makes September an excellent time to visit and appreciate the vibrant autumn scenery in Akranes.

Temperature

As September commences, the average high-temperature subtly reduces, transitioning from a cool 12.8°C (55°F) in August to a frosty 9.6°C (49.3°F). Akranes's nocturnal September readings average at a still chilly 6.2°C (43.2°F), showing little variation from the daytime temperatures.

Humidity

January, February and September, with an average relative humidity of 82%, are the most humid months in Akranes.

Rainfall

In Akranes, Iceland, in September, during 17.8 rainfall days, 40mm (1.57") of precipitation is typically accumulated. In Akranes, during the entire year, the rain falls for 166.2 days and collects up to 416mm (16.38") of precipitation.

Snowfall

June through September are months without snowfall in Akranes.

Sea temperature

In Akranes, in September, the average water temperature is 9.7°C (49.5°F).
Note: In 9.7°C (49.5°F), even brief exposure to 13°C (55.4°F) feels biting, and anything less than 10°C (50°F) risks cold shock and impaired breathing, considering one's health.

Daylight

The average length of the day in September in Akranes is 13h and 1min.
On the first day of September, sunrise is at 06:12 and sunset at 20:44. On the last day of the month, sunrise is at 07:36 and sunset at 18:59 GMT.

Sunshine

In Akranes, Iceland, the average sunshine in September is 4.5h.

UV index

The average daily maximum UV index in September in Akranes is 2. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for the average person.
Note: The daily maximum UV index of 2 in September interprets into the following advice:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades.

Updated: Feb 10, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

The high-temperature during September is 9.6°C (49.3°F) and the low-temperature is 6.2°C (43.2°F).

The months with the highest humidity in Akranes, Iceland, are January, February and September, with an average relative humidity of 82%.

The average relative humidity in September in Akranes is 82%.

In Akranes, Iceland, in September, it is raining for 17.8 days, with typically 40mm (1.57") of accumulated precipitation.

In Akranes, Iceland, snow does not fall in June through September.

In Akranes, Iceland, in September, it doesn't snow. In October, it regularly snows.

In Akranes, Iceland, the average seawater temperature in September is 9.7°C (49.5°F). At temperatures below 10°C (50°F), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 13°C (55.4°F) is not comfortable.

In Akranes, the average day length in September is 13h and 1min.

In September, on the first day of the month, sunrise is at 06:12 and sunset at 20:44. On the last day of the month, in Akranes, sunrise is at 07:36 and sunset at 18:59 GMT.

In Akranes, Iceland, the average sunshine duration in September is 4.5h.

The average daily maximum UV index in September in Akranes, Iceland, is 2. A UV Index of 2, and less, symbolizes a low health threat from exposure to the Sun's UV radiation.

Today

Tomorrow

Long-term

Year J F M A M J J A September O N D

Aug

September

Oct

Average high temperature

12.8°C

9.6°C

6.2°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

17.1km/h

21.2km/h

23.4km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

0.6

Average sea temperature

Average daylight

Average sunshine

Average sunshine days

12.8

8.8

13.3

Average UV index

Average cloud cover

Average visibility

Average temperature in September
Akranes, 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
Akranes, 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
Akranes, 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
Akranes, 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
Akranes, 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
Akranes, 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
Akranes, 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
Akranes, 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
Akranes, 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
Akranes, Iceland

Average daylight in September: 13h and 0min

The month with the longest days is June (Average daylight: 21h and 0min).
The month with the shortest days is December (Average daylight: 4h and 18min).

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
Akranes, 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
Akranes, 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
Akranes, 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
Akranes, 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).