Monthly climate guide
Lisbon weather in August
August in Lisbon is typically warm, with average daytime highs around 23°C (74°F) and night-time lows near 18°C (65°F). The month usually brings about 4 mm of rain (very dry) and is a mix of sun and cloud. Daytime highs are about the same as July and about the same as September.
What stands out in August
- August brings late summer to Lisbon.
- Comfortable temperatures make it easy to walk between Alfama and Belém Tower.
- Rain is well below Lisbon's usual level (around 90% less).
- There's little difference between day and night (around 5°C).
August is typically Lisbon's warmest month.
Avg high
23°C
74°F
Avg low
18°C
65°F
Rainfall
4 mm
very dry
Humidity
81%
relative
Sky
42%
cloud · a mix of sun and cloud
Lisbon weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 15°C / 59°F | 11°C / 53°F | 55 mm | 81% | 64% |
| February | 15°C / 59°F | 11°C / 51°F | 37 mm | 79% | 58% |
| March | 16°C / 60°F | 12°C / 53°F | 63 mm | 79% | 59% |
| April | 17°C / 63°F | 13°C / 56°F | 61 mm | 80% | 60% |
| May | 20°C / 67°F | 15°C / 59°F | 36 mm | 79% | 53% |
| June | 21°C / 70°F | 17°C / 62°F | 7 mm | 79% | 50% |
| July | 22°C / 72°F | 18°C / 64°F | 3 mm | 81% | 49% |
| August | 23°C / 74°F | 18°C / 65°F | 4 mm | 81% | 42% |
| September | 23°C / 73°F | 18°C / 64°F | 21 mm | 80% | 48% |
| October | 21°C / 70°F | 17°C / 62°F | 63 mm | 80% | 59% |
| November | 18°C / 64°F | 14°C / 57°F | 98 mm | 81% | 63% |
| December | 16°C / 60°F | 12°C / 54°F | 49 mm | 82% | 61% |
What to pack for August
- T-shirts plus a light layer for the evening
- Comfortable trainers or sandals for long walks
Is August a good time to visit Lisbon?
Our Lisbon guide recommends: March to May or September to October, avoiding the hottest and most crowded summer months.
Ride Tram 28 through the old town for classic views — but expect it to be crowded; an early morning ride avoids the worst of it.
Best time to visit Lisbon →Other Portugal cities in August
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Lisbon weather in August. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/portugal/lisbon/august
<a href="https://weathercompare.eu/weather/portugal/lisbon/august">Lisbon weather in August</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/portugal/lisbon" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Lisbon weather in August"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/portugal/lisbon/august">Lisbon weather in August</a> – WeatherCompare</p>
Lisbon in August: quick answers
Is August a good time to visit Lisbon?
Yes. August is one of the best months for Lisbon, with highs around 23°C and about 4 mm of rain.
How warm is Lisbon in August?
Average highs are about 23°C (74°F) and average lows about 18°C (65°F), based on 10 years of daily data.
Does it rain a lot in Lisbon in August?
Lisbon typically gets around 4 mm of rain in August — very dry.
When is the best time to visit Lisbon?
March to May or September to October, avoiding the hottest and most crowded summer months.
Figures are long-term averages for the area around Lisbon (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.