The climate in Lisbon during May can be summarized as mild and reasonably dry.
May is in the spring in Lisbon and is typically the 6th warmest month of the year. Daytime maximum temperatures average around a comfortable 22°C (72°F), whilst at night 13°C (56°F) is normal.
|Daytime temperature||22.2°C 71.9°F|
|Nightly temperature||13.3°C 55.9°F|
|Average temperature||17.7°C 63.9°F|
|Daily sunshine||10 hrs|
|Avg rainfall||39 mm 1.5 ins|
|Rainy days||8 days|
|Sea temperature||16.9°C 62.5°F|
|Windspeed||14.4kph 9 mph|
On average May is the 5th driest month of the year in Lisbon with around 39mm 1.5 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 8 days, although this may vary considerably.
On the flip side this corresponds to an average of 10 hours of sunshine per day.
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Lisbon in May 2021.
|Hottest month:||August||28°C 82.4°F|
|Driest month:||July||4mm 0.2ins|
|Coldest month:||January||14.7°C 58.5°F|
|Wettest month:||November||111mm 4.4ins|