This post covers the May weather in Lisbon, including average temperatures and precipitation.
Spring has arrived in Lisbon featuring comfortable afternoons with cool evenings.
Daytime high temperatures during May tend to be around 20-21 C (68-70 F) early in the month, warming gradually to around 23-24 C (73-75 F) near the end of the month.
A few of the warmer afternoons, especially near the end of the month, can reach up near 30 C (86 F).
The record high temperature in Lisbon during May is 35.1 C (95.2 F).
Late night and early morning lows tend to average around 12-13 C (54-55 F) early in May, warming to about 14-15 C (57-59 F) near the end of the month.
A few of the colder mornings, especially early in the month, can dip down near 10 C (50 F).
The record low temperature in Lisbon during May is 6.4 C (43.5 F).
How Often Does It Rain in May?
During May, Lisbon will feature about 17 mostly sunny, 4 partly sunny, and about 10 mostly cloudy days.
You can also expect that 9-10 days will record some rainfall.
However, only about 5 days record at least 1 mm (0.04 inches) or more, and only 2 days will see 10 mm (0.4 inches) or more.
The number of daylight hours continues to increase this month from about 13.8 hours on the 1st to about 14.7 hours by the 31st.
The wind in Lisbon this month is mostly gentle to moderate at 12-28 kph (8-18 mph).
Ocean & Beach
Lisbon lies along the Atlantic coast and has several stunning nearby beaches, however, ocean temperatures this month remain quite chilly at 60-62 F.
What to Wear in Lisbon in May?
Spring weather prevails this month in Lisbon with some warmer summer-like days likely later in the month so best to dress for comfortable afternoons but chilly nights.
A mix of clothes this month makes sense which can include jeans and long pants, both warm and light-weight shirts and tops, a lightweight jacket or windbreaker plus a sweater or two.
Wear sensible shoes as the cobblestone streets can be slippery when wet.
An umbrella will also come in handy during those wet days.
Things to Do in Lisbon in May
There should be plenty of warm, sunny days to enjoy this spring, so you might want to consider going on a pay-what-you-wish walking tour of Lisbon in May.
This is also the perfect time of year to catch a futbol game, as SL Benfica will have at least 3 matches to see this month.
Well-known and beloved composer Hans Zimmer will be performing live at the Altice Arena on May 13th, 2023.
For even more ideas, make sure to read our full post covering things to do in Lisbon in May.