The best time to visit Porto is May, June and September, when average highs sit comfortably between 20 °C and 23.4 °C, rain days thin out and sunshine runs long — June alone averages 21.7 °C with just 8 rain days and 12.9 hours of sun a day. July and August are hotter and driest but fall in peak season, when school holidays crowd the Ribeira and prices climb. Winter (December to February) is the quiet, low season: cooler, wetter and calmer, but still walkable.
Best months MayJuneSeptember
Porto month by month
Average highs and lows (°C), 2016–2025. Highlighted bars are the best months.
| Month | High | Low | Rain days | Sun / day |
|---|---|---|---|---|
| January | 13.6 °C | 7.5 °C | 13 | 6.4 h |
| February | 15.1 °C | 8.2 °C | 10 | 7.8 h |
| March | 15.7 °C | 8.7 °C | 15 | 8.9 h |
| April | 17.7 °C | 10.6 °C | 12 | 10.5 h |
| May | 20 °C | 12.8 °C | 10 | 11.9 h |
| June | 21.7 °C | 14.9 °C | 8 | 12.9 h |
| July | 24.5 °C | 16.7 °C | 3 | 13.4 h |
| August | 24.8 °C | 16.7 °C | 2 | 12.2 h |
| September | 23.4 °C | 15.7 °C | 6 | 10.8 h |
| October | 20.8 °C | 14 °C | 13 | 8.1 h |
| November | 16.5 °C | 10.7 °C | 15 | 6.6 h |
| December | 14.5 °C | 8.7 °C | 14 | 6.4 h |
How the months are picked.A month qualifies when its average high sits in the comfortable 20–28 °C band (scored down towards 9 °C and 37 °C), rain days are few and sunshine hours are high — at least 78 % of the city's best-scoring month. July and August are then set aside as peak season (school-holiday crowds and prices) whenever at least three other months qualify; where summer is the only comfortable window they stay. Figures are ten-year averages (2016-01-01 to 2025-12-31) from ERA5 reanalysis data via Open-Meteo (CC BY 4.0) for the city centre coordinates.
When to go, and what to expect
Spring (Mar–May)
Ideal for walkers and sightseers who want warmth without summer heat; May is a standout.
Summer (Jun–Aug)
June is the sweet spot before the crowds; July and August suit heat-lovers who don't mind queues.
Autumn (Sep–Nov)
September is one of the year's best months; later autumn turns wet and grey.
Winter (Dec–Feb)
Best for budget-minded, crowd-averse travellers happy to pack an umbrella.
Notable events
- June
- São João Festival (Festa de São João)
- May
- Serralves em Festa arts festival
- Winter (February)
- Essência do Vinho wine fair
- December
- Christmas markets and lights
Frequently asked
Is Porto too hot in August?
No — August is the warmest month but averages a manageable 24.8 °C high with just 2 rain days and 12.2 hours of sunshine. It's comfortable weather; the bigger issue is peak-season crowds around the Ribeira.
What is the rainiest month in Porto?
March and November are the wettest, each with 15 rain days. Winter stays damp too, with 13–14 rain days from December through January.
Is winter worth visiting Porto?
Yes, if you want quiet streets. Winter is mild rather than cold — highs of 13.6 °C in January and 15.1 °C in February — but expect 10–13 rain days and only about 6.4 hours of sun a day in the darkest months.
Know when to go? Now decide where to stay — our Porto area guide →
Areas of Porto
Best time to visit near here
Sources
- Open-Meteo historical weather API — monthly climate normals, 2016–2025 (CC BY 4.0)
- ERA5 reanalysis (ECMWF / Copernicus) — the underlying temperature, precipitation and sunshine data
- ReasonStay methodology — how the best months are computed and checked
An independent guide to Porto — honest, verified, no invented data. Climate figures: ERA5 via Open-Meteo, 2016–2025 averages; the best months are computed from them, not opinion.