September weather forecastHöfn, Iceland

September

Weather in September

In Höfn, September marks the transition into autumn with a decline in temperatures down to 8.5°C (47.3°F). Colder weather calculates to an increase in wind speed to an average of 20.7km/h (12.9mph). Although daylight and sunshine hours begin to reduce, there is an increase in cloud covers% and rainfall. Sea temperatures also revert to cooler levels. September’s weather presents a mix of late-summer warmth and hints of the approaching winter.

Temperature

September's presence records an average high-temperature of a frosty 8.5°C (47.3°F), closely mirroring August's climate. September introduces a small decrease to a nighttime average of 6.5°C (43.7°F) in Höfn.

Humidity

In September, the average relative humidity is 82%.

Rainfall

In September, the rain falls for 18.9 days. Throughout September, 125mm (4.92") of precipitation is accumulated. Throughout the year, there are 197.4 rainfall days, and 1278mm (50.31") of precipitation is accumulated.

Snowfall

June through September are months without snowfall.

Sea temperature

In Höfn, the average seawater temperature in September is 9.3°C (48.7°F).
Note: Swimming in 9.3°C (48.7°F) is considered life-threatening. Even a few minutes in 13°C (55.4°F) water is uncomfortable, and swimming below 10°C (50°F) may cause total loss of breathing control and cold shock, depending on a person's physique.

Daylight

In Höfn, Iceland, the average length of the day in September is 13h and 1min.
On the first day of the month, sunrise is at 05:44 and sunset at 20:16. On the last day of September, sunrise is at 07:08 and sunset at 18:32 GMT.

Sunshine

The average sunshine in September in Höfn is 6h.

UV index

The months with the lowest UV index are January through May, September through December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for the ordinary person.
Note: In September, the maximum UV index of 2 suggests this advice:
Apart from children, who require continuous protection, most can endure sun exposure for up to an hour without experiencing burns. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. Stay sun-safe with clothing that is both closely woven and worn loosely.

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

Frequently asked questions

Höfn in September has an average high-temperature of 8.5°C (47.3°F) and an average low-temperature of 6.5°C (43.7°F).

In September, the average relative humidity in Höfn is 82%.

In Höfn, Iceland, in September, it is raining for 18.9 days, with typically 125mm (4.92") of accumulated precipitation.

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

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

In September, the average sea temperature is 9.3°C (48.7°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.

The average day length in September in Höfn, Iceland, is 13h and 1min.

On the first day of September, sunrise is at 05:44 and sunset at 20:16. On the last day of the month, sunrise is at 07:08 and sunset at 18:32 GMT.

In September, the average sunshine duration is 6h.

The months with the lowest UV index in Höfn, Iceland, are January through May, September through December, with an average maximum UV index of 2.

In September, the average daily maximum UV index is 2. A UV Index value of 2, and less, symbolizes a minimal hazard to health 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

10.3°C

8.5°C

5.7°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

18km/h

21.3km/h

25.2km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

2.1

Average sea temperature

Average daylight

Average sunshine

Average sunshine days

10.4

8.2

8.5

Average UV index

Average cloud cover

Average visibility

Average temperature in September
Höfn, Iceland

Average high temperature in September: 8.5°C

The warmest months (with the highest average high temperature) are July and August (10.3°C).
The month with the lowest average high temperature is December (2.2°C).

Average low temperature in September: 6.5°C

The months with the highest average low temperature are July and August (8.3°C).
The coldest month (with the lowest average low temperature) is December (-1.3°C).

Average pressure in September
Höfn, Iceland

Average pressure in September: 1003.9mbar

The month with the highest atmospheric pressure is June (1014.2mbar).
The month with the lowest atmospheric pressure is January (998.3mbar).

Average wind speed in September
Höfn, Iceland

Average wind speed in September: 20.7km/h

The windiest month (with the highest average wind speed) is December (28.7km/h).
The calmest month (with the lowest average wind speed) is July (15.7km/h).

Average humidity in September
Höfn, Iceland

Average humidity in September: 82%

The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is December (77%).

Average rainfall in September
Höfn, Iceland

Average rainfall in September: 125mm

The wettest month (with the highest rainfall) is February (151mm).
The driest month (with the least rainfall) is June (47mm).

Average rainfall days in September
Höfn, Iceland

Average rainfall days in September: 18.9 days

The month with the highest number of rainy days is October (19.5 days).
The month with the least rainy days is June (13.1 days).

Average snowfall in September
Höfn, Iceland

Average snowfall in September: 0mm

The month with the highest snowfall is February (133mm).
The months with the least snowfall are June, July, August and September (0mm).

Average snowfall days in September
Höfn, Iceland

Average snowfall days in September: 0 days

The month with the highest number of snowfall days is March (11.2 days).
The months with the least snowfall days are July, August and September (0 days).

Average sea temperature in September
Höfn, Iceland

Average sea temperature in September: 9.3°C

The best month for swimming (with the highest average sea temperature) is August (10.5°C).
The coldest months (with the lowest average sea temperature) are January and March (5.8°C).

Average daylight in September /
Average sunshine in September
Höfn, 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 18min).

Average sunshine in September: 6h and 0min

The month with the most sunshine is June (Average sunshine: 10h and 0min).
The month with the least sunshine is December (Average sunshine: 2h and 48min).

Average sunshine days in September
Höfn, Iceland

Average sunshine days in September: 8.2 days

The month with the most sunshine days is June (13.3 days).
The month with the least sunshine days is March (6.7 days).

Average UV index in September
Höfn, Iceland

Average UV index in September: 2

The months with the highest UV index are June, July and August (UV index 3).
The months with the lowest UV index are January, February, March, April, May, September, October, November and December (UV index 2).

Average cloud cover in September
Höfn, Iceland

Average cloud cover in September: 57

The month with the most cloud cover is February (Cloud cover 61).
The month with the least cloud cover is December (Cloud cover 54).

Average visibility in September
Höfn, Iceland

Average visibility in September: 9km

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).