Stockholm
Sweden
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Stockholm, Sweden

A beautiful view of the sunset over the port city of Stockholm, Sweden, with a clear sky and surrounding calm waters
A beautiful view of the sunset over the port city of Stockholm, Sweden, with a clear sky and surrounding calm waters
September, the first month of the autumn, in Stockholm, is also a moderate month, with temperature in the range of an average high of 15.1°C (59.2°F) and an average low of 9°C (48.2°F).

Temperature

In September, the average high-temperature drops, from a pleasant 20.4°C (68.7°F) in August, to a moderate 15.1°C (59.2°F). In Stockholm, in September, the average low-temperature is 9°C (48.2°F).

Rainfall

In Stockholm, Sweden, in September, it is raining for 8 days, with typically 52mm (2.05") of accumulated precipitation. In Stockholm, Sweden, during the entire year, the rain falls for 99 days and collects up to 528mm (20.79") of precipitation.

Sea temperature

In September, the average sea temperature is 14.9°C (58.8°F).
Note: Swimming in 14.9°C (58.8°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

The average length of the day in September is 12.8h.

Sunshine

In Stockholm, the average sunshine is 5.1h.

UV index

The average daily maximum UV index in Stockholm is 3. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to the UV radiation for the average person.
Note: The daily maximum UV index of 3 in September interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.

What is the temperature in September in Stockholm?

In September, in Stockholm, Sweden, the average high-temperature is 15.1°C (59.2°F), and the average low-temperature is 9°C (48.2°F).

How much does it rain in Stockholm in September?

In September, in Stockholm, the rain falls for 8 days. Throughout September, 52mm (2.05") of precipitation is accumulated.

What is the water temperature in September in Stockholm?

In September, the average sea temperature in Stockholm, Sweden, is 14.9°C (58.8°F). Swimming in 14.9°C (58.8°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 Stockholm?

In September, the average length of the day in Stockholm, Sweden, is 12.8h.

How long on average sun shines in September in Stockholm?

In Stockholm, Sweden, the average sunshine in September is 5.1h.

How high is the UV index in September in Stockholm?

In September, the average daily maximum UV index in Stockholm, Sweden, is 3. A UV Index estimate of 3 to 5 represents a moderate vulnerability from the exposure to the Sun's UV rays.
Average temperature in September - Stockholm, Sweden
  • Average high temperature in September: 15.1°C

The warmest month (with the highest average high temperature) is July (21.9°C).
The month with the lowest average high temperature is January (-0.7°C).

  • Average low temperature in September: 9°C

The month with the highest average low temperature is July (13.4°C).
The coldest month (with the lowest average low temperature) is February (-5.3°C).

Average rainfall in September - Stockholm, Sweden
  • Average rainfall in September: 52mm

The wettest month (with the highest rainfall) is July (65mm).
The driest month (with the lowest rainfall) is February (27mm).

Average rainfall days in September - Stockholm, Sweden
  • Average rainfall days in September: 8 days

Months with the highest number of rainy days are November and December (10 days).
Months with the lowest number of rainy days are April and May (6 days).

Average sea temperature in September - Stockholm, Sweden
  • Average sea temperature in September: 14.9°C

The best month for swimming (with the highest average sea temperature) is August (18.8°C).
The coldest month (with the lowest average sea temperature) is February (1°C).

Average daylight in September / Average sunshine in September - Stockholm, Sweden
  • Average daylight in September: 12.8h

The month with the longest days is June (Average daylight: 18.5h).
The month with shortest days is December (Average daylight: 6.2h).

  • Average sunshine in September: 5.1h

The month with most sunshine is June (Average sunshine: 9.7h).
The month with least sunshine is December (Average sunshine: 1.1h).

Average UV index in September - Stockholm, Sweden
  • Average UV index in September: 3

Months with the highest UV index are June and July (UV index 5).
Months with the lowest UV index are January, November and December (UV index 0).