September weather forecast and climate
Sundsvall, Sweden

Average temperature in September - Sundsvall, Sweden
  • Average high temperature in September: 14°C

The warmest month (with the highest average high temperature) is July (21°C).
The month with the lowest average high temperature is January (-5°C).

  • Average low temperature in September: 5°C

The month with the highest average low temperature is July (10°C).
The coldest month (with the lowest average low temperature) is January (-15°C).

Average rainfall in September - Sundsvall, Sweden
  • Average rainfall in September: 64mm

Wettest months (with the highest rainfall) are August and September (64mm).
The driest month (with the lowest rainfall) is February (28mm).

Average rainfall days in September - Sundsvall, Sweden
  • Average rainfall days in September: 15 days

Months with the highest number of rainy days are January and December (16 days).
Months with the lowest number of rainy days are April, May and June (11 days).

Average sea temperature in September - Sundsvall, Sweden
  • Average sea temperature in September: 12°C

The best month for swimming (with the highest average sea temperature) is August (15°C).
Coldest months (with the lowest average sea temperature) are January, February and March (1°C).

Average daylight in September / Average sunshine in September - Sundsvall, Sweden
  • Average daylight in September: 13h

The month with the longest days is June (Average daylight: 19.8h).
The month with shortest days is December (Average daylight: 5.2h).

  • Average sunshine in September: 4h

The month with most sunshine is June (Average sunshine: 9h).
Months with least sunshine are January, February, November and December (Average sunshine: 1).

Average UV index in September - Sundsvall, Sweden
  • Average UV index in September: 2

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

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