Lisbon weather by month
Lisbon is warmest in August (29°C average high) and coolest in January (15°C). For warm, mostly dry weather, go May to September.
Warmest month
August
29°C
Coolest month
January
15°C
Wettest month
March
11 rainy days
Flight from London
2½h
direct, estimated
Lisbon temperature by month
Tap a month for the detail and warmer alternatives.
When to go to Lisbon
What is the best month to visit Lisbon for sun?
For warm, mostly dry days, go May to September, going by our 10-year averages.
What is the hottest month in Lisbon?
August averages 29°C. January is the coolest at 15°C.
When does it rain most in Lisbon?
March, with about 11 wet days.
When is the sea warm enough to swim in Lisbon?
The sea never averages 21°C. It peaks at 20°C.
Planning the trip? Start with our 3-day Lisbon itinerary, and see the best time to visit Lisbon for crowds and events.
How we measured this
Daily averages from 2016 to 2025, from the Open-Meteo historical weather archive (ECMWF ERA5 reanalysis); sea temperatures are 2023 to 2025 averages from the Open-Meteo marine archive. A rainy day has at least 1 mm of rain.
Going to Lisbon?
Save the places you find on TikTok and Instagram for Lisbon to one map, and Dream Trip will plan the days around them.
