September weather forecast
Tromsø, Norway

The bridge connecting the city of Tromsø, Norway
The bridge connecting the city of Tromsø, Norway

Weather in September

The first month of the autumn, September, is also a frosty month in Tromsø, Norway, with temperature in the range of an average low of 5.4°C (41.7°F) and an average high of 9.7°C (49.5°F).

Temperature

In Tromsø, the average high-temperature in September marginally drops from a moderate 13.1°C (55.6°F) in August to a chilly 9.7°C (49.5°F). In Tromsø, the average low-temperature is 5.4°C (41.7°F).

Humidity

The average relative humidity in September is 83%.

Rainfall

In Tromsø, during September, the rain falls for 17.6 days and regularly aggregates up to 80mm (3.15") of precipitation. Throughout the year, in Tromsø, Norway, there are 148.1 rainfall days, and 987mm (38.86") of precipitation is accumulated.

Snowfall

January through June, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 1 snowfall days, it receives 16mm (0.63") of snow. Throughout the year, in Tromsø, Norway, there are 120.1 snowfall days, and 2826mm (111.26") of snow is accumulated.

Sea temperature

In Tromsø, the average seawater temperature in September is 10.1°C (50.2°F).
Note: 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.

Daylight

The average length of the day in September is 13h and 20min.
On the first day of the month, sunrise is at 05:01 and sunset at 20:27. On the last day of September, sunrise is at 06:54 and sunset at 18:13 CEST.

Sunshine

In Tromsø, the average sunshine in September is 5.7h.

UV index

The average daily maximum UV index in September in Tromsø is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from unsafe exposure to UV radiation for average individuals.
Note: In September, the average maximum UV index of 2 translate into the following recommendations:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in September in Tromsø?

In Tromsø, Norway, in September, the average high-temperature is 9.7°C (49.5°F), and the average low-temperature is 5.4°C (41.7°F).

What is the average humidity in September in Tromsø?

In September, the average relative humidity is 83%.

How many days does it rain in September in Tromsø?

In Tromsø, during September, the rain falls for 17.6 days and regularly aggregates up to 80mm (3.15") of precipitation.

When does it start snowing in Tromsø?

September is the first month it typically snows in Tromsø. Throughout September, in the average 1 snowfall days, it receives 16mm (0.63") of snow.

What is the sea water temperature in September in Tromsø?

In Tromsø, in September, the average water temperature is 10.1°C (50.2°F). Swimming in 10.1°C (50.2°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation.

What is the average length of the day in September in Tromsø?

In Tromsø, Norway, the average day length in September is 13h and 20min.

When are sunrise and sunset in September in Tromsø?

On the first day of September, sunrise is at 05:01 and sunset at 20:27. On the last day of the month, sunrise is at 06:54 and sunset at 18:13 CEST.

How many hours of sunshine does Tromsø have in September?

The average sunshine duration in September in Tromsø, Norway, is 5.7h.

What is the UV index intensity in September in Tromsø?

The average daily maximum UV index in September is 2. A UV Index of 2, and less, symbolizes a low health threat from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Tromsø, Norway

Average temperature in September - Tromsø, Norway
  • Average high temperature in September: 9.7°C

The warmest month (with the highest average high temperature) is July (13.9°C).
The month with the lowest average high temperature is January (-4.5°C).

  • Average low temperature in September: 5.4°C

The month with the highest average low temperature is July (8.7°C).
The coldest month (with the lowest average low temperature) is February (-9.1°C).

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Average pressure in September
Tromsø, Norway

Average pressure in September - Tromsø, Norway
  • Average pressure in September: 1008.9mbar

The month with the highest atmospheric pressure is May (1013.8mbar).
The month with the lowest atmospheric pressure is December (1000.7mbar).

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Average wind speed in September
Tromsø, Norway

Average wind speed in September - Tromsø, Norway
  • Average wind speed in September: 11.9km/h

The windiest month (with the highest average wind speed) is March (17km/h).
The calmest month (with the lowest average wind speed) is July (9.5km/h).

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Average humidity in September
Tromsø, Norway

Average humidity in September - Tromsø, Norway
  • Average humidity in September: 83%

The month with the highest relative humidity is April (89%).
The month with the lowest relative humidity is July (79%).

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Average rainfall in September
Tromsø, Norway

Average rainfall in September - Tromsø, Norway
  • Average rainfall in September: 80mm

The wettest month (with the highest rainfall) is March (103mm).
The driest month (with the least rainfall) is July (55mm).

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Average rainfall days in September
Tromsø, Norway

Average rainfall days in September - Tromsø, Norway
  • Average rainfall days in September: 17.6 days

The month with the highest number of rainy days is June (19.3 days).
The month with the least rainy days is February (4.7 days).

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Average snowfall in September
Tromsø, Norway

Average snowfall in September - Tromsø, Norway
  • Average snowfall in September: 16mm

The month with the highest snowfall is March (569mm).
The months with the least snowfall are July and August (0mm).

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Average snowfall days in September
Tromsø, Norway

Average snowfall days in September - Tromsø, Norway
  • Average snowfall days in September: 1 days

The month with the highest number of snowfall days is March (22.9 days).
The months with the least snowfall days are July and August (0 days).

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Average sea temperature in September
Tromsø, Norway

Average sea temperature in September - Tromsø, Norway
  • Average sea temperature in September: 10.1°C

The best month for swimming (with the highest average sea temperature) is August (11.3°C).
The coldest month (with the lowest average sea temperature) is March (4.2°C).

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Average daylight in September /
Average sunshine in September
Tromsø, Norway

Average daylight in September / Average sunshine in September - Tromsø, Norway
  • Average daylight in September: 13h and 20min

The month with the longest days is August (Average daylight: 18h and 1min).
The months with the shortest days are June and December (Average daylight: 0h and 0min).

  • Average sunshine in September: 5h and 42min

The month with the most sunshine is August (Average sunshine: 8h and 0min).
The month with the least sunshine is December (Average sunshine: 0h and 24min).

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Average sunshine days in September
Tromsø, Norway

Average sunshine days in September - Tromsø, Norway
  • Average sunshine days in September: 10.6 days

The month with the most sunshine days is January (13.2 days).
The month with the least sunshine days is March (6.2 days).

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Average UV index in September
Tromsø, Norway

Average UV index in September - Tromsø, Norway
  • 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, March, April, October, November and December (UV index 1).

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Average cloud cover in September
Tromsø, Norway

Average cloud cover in September - Tromsø, Norway
  • Average cloud cover in September: 62

The month with the most cloud cover is March (Cloud cover 75).
The month with the least cloud cover is July (Cloud cover 58).

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Average visibility in September
Tromsø, Norway

Average visibility in September - Tromsø, Norway
  • Average visibility in September: 9km

The months with the highest visibility are June, July, August, September, October and November (9km).
The month with the lowest visibility is April (7km).

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