Lisbon Weather in August
Portugal · Mediterranean climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
August in Lisbon sees average temperatures ranging from a low of 18.4°C (65.1°F) to a high of 28.5°C (83.3°F), with a mean of 22.5°C (72.5°F). Compared to the annual average of 17.2°C (63.0°F), this month is 5.3°C warmer than the yearly norm. Precipitation averages 1.0mm, making it approximately 48.0mm drier than the monthly average of 49.0mm. This is the driest month of the year, with just 1.0mm of precipitation. The city receives an average of 12.3 hours of sunshine per day during August, with relative humidity averaging 68.9%. Wind speeds reach an average maximum of 21.4 km/h. For travelers, this month offers a temperature experience in Lisbon, with drier-than-average conditions compared to the rest of the year.
Lisbon's hills plus humidity make packing an art form. I showed up in July in linen — big mistake, the UV hits 9 and the city is essentially a suntrap. Pack breathable layers, a wide-brim hat, and the strongest SPF you own. My ideal window is mid-September to mid-October: 24°C, fewer crowds, and the Tagus breeze actually feels good. Skip February — it's wetter than you'd think. Tram 28 in summer is a sweatbox; ride it in November instead, when it's 16°C and the queues vanish.
August vs Adjacent Months
| Metric | July | August | September |
|---|---|---|---|
| Mean Temp | 22.7°C (72.9°F) | 22.5°C (72.5°F) | 20.9°C (69.6°F) |
| Rainfall | 2.9mm | 1.0mm | 51.5mm |
| Sunshine | 13.4 hrs | 12.3 hrs | 10.7 hrs |
| Humidity | 65.4% | 68.9% | 72.5% |
| Wind | 20.8 km/h | 21.4 km/h | 19.6 km/h |
| Rainy Days | 2.2 | 1.4 | 10.4 |
Seasonal Context
August falls in Summer in the Northern Hemisphere. Summer brings the warmest conditions of the year with the longest daylight hours. For travelers visiting Lisbon in August, the data indicates favorable conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Lisbon in August?
The average temperature in Lisbon during August ranges from 18.4°C (65.1°F) to 28.5°C (83.3°F), with a mean of 22.5°C (72.5°F).
How much does it rain in Lisbon in August?
Lisbon receives an average of 1.0mm of precipitation in August, spread across approximately 1.4 rainy days. This is the driest month of the year.
What should I pack for Lisbon in August?
Based on August weather data, pack layers including light jackets and t-shirts, plus an umbrella.
Is August a good time to visit Lisbon?
August is a good time to visit Lisbon, with comfortable temperatures and manageable rainfall.
Other Months for Lisbon
Cities with Similar August Climate (Mediterranean)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 38.72°, -9.14°. Timezone: Europe/Lisbon. Last updated: 2026-07-30.