Lisbon
Portugal
Long-term weather forecast
Long-term weather forecast

September weather forecast and Climate
Lisbon, Portugal

The beautiful hillside city of Lisbon in Portugal, with a high, far view of the Sao Jorge Castle, seen on a sunny day
The beautiful hillside city of Lisbon in Portugal, with a high, far view of the Sao Jorge Castle, seen on a sunny day
The days are long and warm. The mean September temperature is 72°F (22.2°C), the sea water's 66°F (18.9°C), and the sky is primarily clear.
September is a great time to be hanging around the city's miradouros (viewpoints.) Windsurfing at Costa da Caparica is an ideal activity in this time of year.
  • The average high temperature in September: 26.5°C

The warmest month (with the highest average high temperature) is August (28.3°C).
The month with the lowest average high temperature is January (14.8°C).

  • The average low temperature in September: 17.6°C

The month with the highest average low temperature is August (18.6°C).
The coldest month (with the lowest average low temperature) is January (8.3°C).

  • The average rainfall in September: 32.9mm

The wettest month (with the highest rainfall) is November (127.6mm).
The driest month (with the lowest rainfall) is July (4.2mm).

  • The average rainfall days in September: 6 days

Months with the highest number of rainy days are January, February and December (14 days).
Months with the lowest number of rainy days are July and August (2 days).

  • The average sea temperature in September: 20°C

Best months for swimming (with the highest average sea temperature) are August and September (20°C).
Coldest months (with the lowest average sea temperature) are January, February and March (15°C).

  • The average daylight in September: 12h

Months with the longest days are June and July (Average daylight: 15h).
Months with shortest days are January, November and December (Average daylight: 10h).

  • The average sunshine in September: 9h

Months with most sunshine are July and August (Average sunshine: 11h).
Months with least sunshine are January, February, November and December (Average sunshine: 5).

  • The average UV index in September: 6

Months with the highest UV index are June and July (UV index 9).
Months with the lowest UV index are January and December (UV index 2).

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