September weather forecast
Trondheim, Norway

Weather in September

The first month of the autumn, September, is still a cool month in Trondheim, Norway, with average temperature fluctuating between 12°C (53.6°F) and 6°C (42.8°F).

Temperature

In Trondheim, the average high-temperature decreases, from an enjoyable 17°C (62.6°F) in August, to a fresh 12°C (53.6°F). In September, the average low-temperature is 6°C (42.8°F).

Rainfall

The month with the most rainfall in Trondheim is September when the rain falls for 24 days and typically aggregates up to 133mm (5.24") of precipitation.

Sea temperature

In September, the average sea temperature is 13.4°C (56.1°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

In Trondheim, Norway, the average length of the day is 13h.

Sunshine

In September, the average sunshine in Trondheim is 3h.

UV index

In Trondheim, the average daily maximum UV index in September is 2. A UV Index of 2, and less, symbolizes a minimal health hazard from unsafe exposure to the UV radiation for the average person.
Note: The average daily UV index of 2 transform into the following instructions:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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.
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FAQ

What is the wettest month in Trondheim?

The month with the most rainfall in Trondheim, Norway, is September when the rain falls for 24 days and typically aggregates up to 133mm (5.24") of precipitation.

How much does it rain in Trondheim in September?

In Trondheim, Norway, during September, the rain falls for 24 days and regularly aggregates up to 133mm (5.24") of precipitation.

What is the sea water temperature in September in Trondheim?

In September, the average sea temperature in Trondheim, Norway, is 13.4°C (56.1°F). Swimming in 13.4°C (56.1°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 Trondheim?

In Trondheim, Norway, the average length of the day in September is 13h.

How many hours of sunshine does Trondheim have in September?

In Trondheim, the average sunshine in September is 3h.

What is the UV index reading in September in Trondheim?

In September, the average daily maximum UV index is 2. A UV Index of 2, and less, symbolizes a minimal hazard to health from the exposure to the Sun's UV rays.

Average temperature in September
Trondheim, Norway

Average temperature in September - Trondheim, Norway
  • Average high temperature in September: 12°C

The warmest month (with the highest average high temperature) is August (17°C).
Months with the lowest average high temperature are January and February (0°C).

  • Average low temperature in September: 6°C

Months with the highest average low temperature are July and August (9°C).
The coldest months (with the lowest average low temperature) are January and February (-5°C).

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Average rainfall in September
Trondheim, Norway

Average rainfall in September - Trondheim, Norway
  • Average rainfall in September: 133mm

The wettest month (with the highest rainfall) is September (133mm).
The driest month (with the least rainfall) is May (53mm).

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Average rainfall days in September
Trondheim, Norway

Average rainfall days in September - Trondheim, Norway
  • Average rainfall days in September: 24 days

Months with the highest number of rainy days are September and December (24 days).
The month with the least rainy days is May (15 days).

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Average sea temperature in September
Trondheim, Norway

Average sea temperature in September - Trondheim, Norway
  • Average sea temperature in September: 13.4°C

The best month for swimming (with the highest average sea temperature) is August (14.8°C).
The coldest month (with the lowest average sea temperature) is March (4.9°C).

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

Average daylight in September / Average sunshine in September - Trondheim, Norway
  • Average daylight in September: 13h

The month with the longest days is June (Average daylight: 20.4h).
The month with the shortest days is December (Average daylight: 4.7h).

  • Average sunshine in September: 3h

Months with the most sunshine are May and June (Average sunshine: 7h).
Months with the least sunshine are January and December (Average sunshine: 0).

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Average UV index in September
Trondheim, Norway

Average UV index in September - Trondheim, Norway
  • Average UV index in September: 2

Months with the highest UV index are June and July (UV index 4).
Months with the lowest UV index are January, February, November and December (UV index 0).

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