Long-term weather forecast
Long-term weather forecast

September weather forecast and Climate
Luleå, Sweden

  • The average high temperature in September: 13.4°C

The warmest month (with the highest average high temperature) is July (20.7°C).
The month with the lowest average high temperature is January (-5.1°C).

  • The average low temperature in September: 6°C

The month with the highest average low temperature is July (12.8°C).
The coldest month (with the lowest average low temperature) is February (-13.6°C).

  • The average rainfall in September: 63mm

The wettest month (with the highest rainfall) is August (64mm).
The driest month (with the lowest rainfall) is April (29mm).

  • The average rainfall days in September: 15 days

Months with the highest number of rainy days are January, November and December (16 days).
Months with the lowest number of rainy days are April, May and June (10 days).

  • The average sea temperature in September: 11.8°C

The best month for swimming (with the highest average sea temperature) is July (16.3°C).
The coldest month (with the lowest average sea temperature) is February (-0.7°C).

  • The average daylight in September: 13h

The month with the longest days is June (Average daylight: 22h).
The month with shortest days is December (Average daylight: 3h).

  • The average sunshine in September: 5.1h

The month with most sunshine is July (Average sunshine: 10h).
The month with least sunshine is December (Average sunshine: 0.1h).

  • The 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).