weather in lisbon, portugal fahrenheit
Averages for Lisbon in September. September sees the weather in Lisbon remain extremely warm. The average temperature still reaches a high of 26Â°C (that's about 79Â°F), and never dips any lower than 17Â°C (about 63Â°F). You will see several days, at least four, with temperatures above 32Â°C. The daily average will never drop below 21Â°C.