portugal avg temp
Average Temperatures in Lisbon, Portugal. 1  The average annual temperature in Lisbon, Portugal is very mild at 16.8 degrees Celsius (62.2 degrees Fahrenheit). 2  There is a variation of mean monthly temperatures of 11.4 C (20.5F) which is a low range. 3  The range/ variation of daily mean temperatures is 8 C (14.5 F).