Lisbon weather in May
Lisbon averages 23°C by day and 14°C at night in May, with the sea at 18°C and 5 days with at least 1 mm of rain. It warms up by about 2°C into June.
Day
23°C
Night
14°C
Sea
18°C
Rainy days
5
Flight from London
2½h
What May feels like
May is warm in Lisbon: T-shirt days, a light layer for evenings.
The sea is 18°C: cold for swimming, so plan on a heated pool.
Rain is occasional, on about 5 days.
Of the 48 sun destinations we track, Lisbon is the #41 warmest in May, and #18 of 23 within 5½ hours of the UK.
Want it warmer in May?
These are hotter than Lisbon this month for at most an hour and a half more flying:
Lisbon weather by month
May is highlighted. Compare with April and June, or see the full year in Lisbon.
Lisbon in May: quick answers
Is Lisbon hot in May?
May is warm in Lisbon: T-shirt days, a light layer for evenings. Average highs are 23°C and lows 14°C.
Can you swim in Lisbon in May?
The sea is 18°C: cold for swimming, so plan on a heated pool.
Does it rain in Lisbon in May?
Rain is occasional, on about 5 days.
What is the warmest month in Lisbon?
August, at an average high of 29°C. The coolest is January at 15°C.
How long is the flight to Lisbon from the UK?
About 2½h direct from London, estimated from the 1,571 km distance. Check your airline for exact times.
Still choosing? See where is hot in May for every destination ranked by temperature, sea and flight time.
How we measured this
Averages of every day in May from 2016 to 2025, from the Open-Meteo historical weather archive (ECMWF ERA5 reanalysis). Sea temperature is the 2023 to 2025 average from the Open-Meteo marine archive. A rainy day has at least 1 mm of rain. Reanalysis describes an area about 25 km across, so sheltered resorts can run a degree or two warmer. Flight time is a distance-based estimate from London Heathrow.
Planning Lisbon in May?
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