Lisbon weather in August
August in Lisbon: warm, dry, with clean air — an excellent time to visit.
#5 of 12 months in Lisbon · #116 of 604 destinations to visit in August · comfort 88/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Lisbon climate normals — August
| Daytime high | 26°C / 79°F | 🌤 warm |
|---|---|---|
| Nighttime low | 18°C / 65°F | |
| Feels like (high) | 27°C / 81°F | |
| Rainfall | 1 mm / 0 in | ☀️ dry |
| Rainy days | 0 days | |
| Humidity | 72% | 💧 humid |
| Dew point | 16°C / 61°F | |
| Sunshine | 12.1 h/day | |
| Daylight | 13.6 h | |
| Wind | 25 km/h / 15 mph | |
| Air quality (US AQI) | 37 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Lisbon in August — FAQ
- Is August a good time to visit Lisbon?
- August in Lisbon: warm, dry, with clean air — an excellent time to visit. It ranks #5 of 12 months for Lisbon on SeasonMap's comfort score (88/100).
- What is the weather like in Lisbon in August?
- In August, Lisbon averages a daily high of 26.1°C and a low of 18.3°C, with about 1.2 mm of rain over roughly 0.4 rainy days.
- What is the air quality in Lisbon in August?
- Lisbon has a mean US Air Quality Index of about 37 in August.