Verdict: Excellent month
Lisbon Weather in August
August runs warm in Lisbon, with daily highs around 28°C (82°F) and nights near 18°C (64°F). Rain is a non-issue, with only ~0 wet days in an average year. Overall, August is one of the best months of the year to be in Lisbon.
Average high
28°C / 82°F
Average low
18°C / 64°F
Rain days
~0
Precipitation
1 mm
What to pack for Lisbon in August
- Summer clothes, plus one light layer for air-con and evenings
- High-SPF sunscreen, sunglasses, and a refillable water bottle
- Comfortable walking shoes — every guide on this site assumes you'll use them
August against the rest of the year
Warmest in Lisbon: Jul (29°C / 84°F) · Coolest: Jan (15°C / 59°F) · Wettest: Oct (~11 rain days)
15°
9°
Jan
17°
10°
Feb
18°
11°
Mar
20°
12°
Apr
23°
15°
May
25°
16°
Jun
29°
18°
Jul
28°
18°
Aug
26°
17°
Sep
23°
16°
Oct
19°
12°
Nov
16°
10°
Dec
Daily highs / lows in °C · bars show rain days per month · ERA5 climate normals (2020–2024)