Long term weather forecast
Long term weather forecast

September weather forecast and Climate
Lisbon, Portugal

  • Average high temperature in September: 79.7°F

Warmest month (with highest average high temperature) is August (82.9°F).
Month with lowest average high temperature is January (58.6°F).

  • Average low temperature in September: 63.7°F

Month with highest average low temperature is August (65.5°F).
Coldest month (with lowest average low temperature) is January (46.9°F).

  • Average rainfall in September: 1.3"

Wettest months (with highest rainfall) are November and December (5").
Driest months (with lowest rainfall) are July and August (0.2").

  • Average rainfall days in September: 6 days

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

  • Average sea temperature in September: 68°F

Best months for swimming (with highest average sea temperature) are August and September (68°F).
Coldest months (with lowest average sea temperature) are January, February and March (59°F).

  • Average daylight in September: 12h

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

  • 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).

  • Average UV index in September: 6

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