Douglas
Isle of Man
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Douglas, Isle of Man

Green lawns overlooking a ferry terminal in the small town of Douglas, Isle of Man
Green lawns overlooking a ferry terminal in the small town of Douglas, Isle of Man
  • Average high temperature in September: 15°C

Warmest months (with the highest average high temperature) are July and August (17°C).
Months with the lowest average high temperature are January and February (6°C).

  • Average low temperature in September: 10°C

Months with the highest average low temperature are July and August (11°C).
Coldest months (with the lowest average low temperature) are January, February and March (2°C).

  • Average rainfall in September: 142mm

The wettest month (with the highest rainfall) is October (171mm).
The driest month (with the lowest rainfall) is May (85mm).

  • Average rainfall days in September: 16 days

Months with the highest number of rainy days are January and November (20 days).
The month with the lowest number of rainy days is July (13 days).

  • Average sea temperature in September: 14°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 February and March (7°C).

  • Average daylight in September: 13h

Months with the longest days are June and July (Average daylight: 17h).
The month with shortest days is December (Average daylight: 7h).

  • Average sunshine in September: 4h

Months with most sunshine are May and June (Average sunshine: 7h).
The month with least sunshine is December (Average sunshine: 1h).

  • Average UV index in September: 3

Months with the highest UV index are June and July (UV index 6).
Months with the lowest UV index are January and December (UV index 0).

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