August in Lisbon averages highs of 28 °C (83 °F) and lows of 18 °C (65 °F), with almost no rainy days and 13 h 40 min of daylight. The sea is cold, around 17 °C (63 °F).
August weather in Lisbon at a glance
average high to low each dot ≈ 3 rainy days
Is August a good time to visit Lisbon?
Good time to go: hot and fairly dry. August is usually high season in Lisbon: book rooms early, as prices are typically at their highest.
Our rule: a month scores 2 points for comfortable average highs of 18–28 °C (1 point for 14–18 or 28–32 °C) and 2 points for 5 or fewer rainy days (1 point for 6–10). Average highs above 35 °C or below 8 °C make it a tough month whatever the rain. A rainy day here means 2 mm of rain or more. 4 points = great, 3 = good, 2 = mixed, 0–1 = tough.
Holidays and events in August 2026
- Sat 15 Aug: Assumption Day (Assunção de Nossa Senhora) public holiday
Banks and many shops close on public holidays, and museums may change their hours, so check before you go.
Things to do in Lisbon in August
August's weather suits a mix of outdoor sights and museums, so the open-air ones come first.
- Alfama and São Jorge Castle — lanes, viewpoints and the castle walls outdoors
- Belém: Jerónimos Monastery and the tower — plus pastéis de nata at the source outdoors
- Tram 28 and the miradouros — Senhora do Monte and Graça for sunset outdoors
- Sintra day trip — Pena Palace and Quinta da Regaleira, 40 min by train outdoors
- Gulbenkian Museum — one of Europe's best small collections indoors
- National Tile Museum (Azulejo) — five centuries of Portuguese tiles indoors
Where to stay: Baixa and Chiado for first-timers; Alfama for character; Príncipe Real for quiet streets.
What to pack for Lisbon in August
- Summer clothes, sunglasses and sunscreen.
- Comfortable walking shoes.
What a day in Lisbon costs
| Budget traveller | Mid-range | |
|---|---|---|
| Typical total per person, per day | €55–120 | €150–300 |
Excluding flights. August is usually high season in Lisbon: book rooms early, as prices are typically at their highest.
August in nearby cities
| City | High / low | Rainy days | Verdict |
|---|---|---|---|
| Porto | 25° / 16° | 2 | Great time to go |
| Seville | 37° / 22° | 0 | Tough month |
| Madrid | 33° / 20° | 1 | Mixed weather |
Plan your Lisbon trip
- Best Time to Visit Portugal: Month-by-Month Guide 2026
- How to Plan a Trip on a Budget With AI (So the Total Actually Adds Up)
- 3 Days in Lisbon on a Budget — A Day-by-Day Itinerary
- Sintra Day Trip from Lisbon: Easy 2026 Plan + Real Costs
Want the whole trip planned? Join the Journey waitlist: tell it where, when and your budget, and it plans every day hour by hour.
FAQ
Is August a good time to visit Lisbon?
By the numbers, August is a good time to go: hot and fairly dry, with average highs of 28 °C (83 °F) and almost no rainy days. August is usually high season in Lisbon: book rooms early, as prices are typically at their highest. The best months for weather are May, June, July, September.
How warm is Lisbon in August?
Average highs are 28 °C (83 °F) and lows 18 °C (65 °F) (2015–2024 averages). The sea is cold, around 17 °C (63 °F).
Does it rain a lot in Lisbon in August?
Expect about 0 days with 2 mm of rain or more, about 1 mm in total. It is the driest month of the year in Lisbon.
Sources: climate averages from Open-Meteo historical weather (ERA5 reanalysis, 2015–2024); sea temperatures from the Open-Meteo marine API (2023–2024); public holidays from Nager.Date. Daylight is calculated for the 15th of the month. Averages are a guide, not a forecast. Costs are typical ranges per person per day, excluding flights.