Portugal
Lisbon in August: weather, sea & travel advice
This month's data profile
Strong month under the current formula
Lisbon in August is climatically well suited to city breaks, active holidays and hiking, beach holidays and family holidays. The average daily high is around 23 °C, and the sea is about 19 °C. With about 1 rainy day it is very dry.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
84/100 · #1
Warmth
#1
Dryness
#2
Sun
#4
Sea warmth
#2
Published best categories: Overall, Beach, City break, Active, Family
Lisbon · AugustPhoto: Dale Cruse - 10M views from San Francisco, CA, USA · CC BY 4.0Climate facts
- Average high
- 23 °C
- Average low
- 18 °C
- Sea
- 19 °C
- Rainy days (est.)
- 1 rainy day (est.)
- Sun (est.)
- 8 h/day
- Humidity
- 81 %
Climate evidence with direct month comparison
The highlighted row is the selected month. Precipitation total and rainy days are separate monthly averages.
| Month | Avg high °C | Avg low °C | Rainy days (est.) | Precipitation mm | Sun h/day (est.) | Humidity % | Wind m/s | Sea °C | Score |
|---|---|---|---|---|---|---|---|---|---|
| July | 23 | 18 | 1 | 3 | 9.1 | 80 | 4.8 | 18 | 82 |
| August (selected) | 23 | 18 | 1 | 5 | 8.3 | 81 | 4.5 | 19 | 84 |
| September | 22 | 18 | 5 | 28 | 6.6 | 81 | 4.0 | 19 | 81 |
How do the previous and next months compare?
Baseline: August (84/100)
Positive and negative values show the change from the selected month.
| Score Δ | Average high Δ | Average low Δ | Rainy days Δ | Rain Δ | Sun Δ | Humidity Δ | Wind Δ | Sea Δ | |
|---|---|---|---|---|---|---|---|---|---|
| July | -2 | -0.6 °C | -0.6 °C | -0.2 | -1.7 mm | +0.8 h | -0.2 % | +0.3 m/s | -0.4 °C |
| September | -3 | -0.9 °C | -0.4 °C | +4 | +22.7 mm | -1.7 h | +0.4 % | -0.4 m/s | +0.1 °C |
All twelve months in context
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Frequently asked questions
How warm is Lisbon in August?
The average daily high is around 23 °C, with an average daily low of about 18 °C.
Can you swim in Lisbon in August?
The sea is about 19 °C (refreshing).
Does it rain a lot in Lisbon in August?
The curated estimate is about 1 rainy day per month, not a directly measured long-term average. Total precipitation averages around 5 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit Lisbon?
By the climate score, June, July, August and September are the strongest months for Lisbon. For a beach trip: June, July, August and September. August is one of them.