What to expect in Lisbon in August
August is a strong choice for Lisbon: 29° / 18°, with the biggest crowds of the year and premium prices.
Lisbon weather in August
Typical conditions in Lisbon during August, based on long-run climate normals rather than any single year. Treat it as a planning guide, not a forecast.
| Average high | 29°C 84°F |
|---|---|
| Average low | 18°C 64°F |
| Rainfall | Dry 3/100 |
| Total rainfall | 6 mm0.2 in |
| Rainy days | 2 |
| Sea temperature | 19°C 66°F |
| Daylight | 13 h 40 min |
| How it feels | Warm and comfortable |
Average highs sit around 29°C with lows near 18°C. It is one of the drier months — pack light.
Crowds & demand
Crowd levels are High for Lisbon — the biggest crowds of the year.
Prices & value
This month counts as high season: premium prices.
What to pack
Light layers for 29°C days and something with sleeves for evenings, which cool to around 18°C. Rain gear is largely optional this month, which keeps your bag light.
What it costs
This is peak pricing for Lisbon. Expect to pay a premium on flights and accommodation, and to book considerably further ahead than usual.
Who this month suits
- Travellers who want the most reliable weather
- Families tied to school holidays
Events & what’s on
No major festivals fall in August, so the destination feels like its everyday self.
Lisbon in August compared with nearby months
If your dates are flexible by a few weeks, this is what shifting them actually buys you.
| Month | Temp | Crowds | Price | Score |
|---|---|---|---|---|
| June | 26° / 16° | High | $$ | 57 |
| July | 28° / 17° | High | $$$ | 50 |
| August · This month | 29° / 18° | High | $$$ | 47 |
| September | 27° / 17° | High | $$ | 59 |
| October | 23° / 14° | Moderate | $$ | 67 |
These months score higher for Lisbon on the same blend of weather, crowds and price. Same destination, better odds.
Or go somewhere else in August
If the destination is negotiable but the month is not, these places are at their best in August.
Figures are climate normals and modelled estimates — a planning guide, not a forecast. We separate fact, estimate and recommendation. Updated October 2026
