How warm is it in Lisbon in August?

Daytime highs averaged 23.1 °C, night-time lows 18.3 °C. The highest value of the past 10 years was 33.1 °C (3 Aug 2018), the lowest 15.9 °C (31 Aug 2020).

How often does it rain in Lisbon in August?

On average there were 0.9 rain days (at least 1 mm) with 4.8 mm of precipitation in total. In 5 of 10 years there was no rain day at all.

Photo: Vitor Oliveira from Torres Vedras, PORTUGAL · CC BY-SA 2.0

🇵🇹 Weather in Lisbon in August

This is what the weather in Lisbon (Portugal) was like in August in 2017–2026.

Key facts at a glance

Prevailing weather: Partly cloudy

Avg. daytime high

23.1 °C

21.9 °C – 24.3 °C

Avg. night-time low

18.3 °C

17.5 °C – 19.8 °C

Avg. rain days in period

0.9

3 % of days · ≥ 1.0 mm

Avg. precipitation in period

4.8 mm

0.9 mm – 19.1 mm

Avg. sunshine per day

n/a

Sunshine duration is not available from this data source.

Avg. sea temperature

–

Sea temperature unavailable for today (daily limit).

Extremes: Highest temperature 33.1 °C (3 Aug 2018) · Lowest temperature 15.9 °C (31 Aug 2020) · Avg. daily peak wind 27 km/h

Weather mix of all days

99Sunny
143Partly cloudy
32Cloudy
7Light rain
2Rain

Summary

On average 23.1 °C during the day and 18.3 °C at night.
On average 0.9 rain days (Rain day = at least 1.0 mm of precipitation) with 4.8 mm of precipitation in total.
In 5 of 10 years there was not a single rain day.
Prevailing: Partly cloudy.
Warmest year: 2018 (avg. 24.3 °C), coolest: 2021 (avg. 21.9 °C).
Wettest year: 2026 (19.1 mm), driest: 2025 (0.9 mm).
Extremes: 33.1 °C on 3 Aug 2018 and 15.9 °C on 31 Aug 2020.

Overall values from all 10 years. How is this calculated?

Temperatures per year

Average over your travel period

Precipitation & rain days

Year by year

2026
Avg. max23.7°Avg. min19.8°
Rain days
4 Rain days
Precipitation
19.1 mm
Avg. sunshine per day
n/a
Sea temperature
–
Max 27.5 °C · Min 18.2 °C
2025
Avg. max23.4°Avg. min18.7°
Rain days
0 Rain days
Precipitation
0.9 mm
Avg. cloud cover
41 % cloudy
Sea temperature
–
Max 28.0 °C · Min 17.5 °C
2024
Avg. max23.2°Avg. min18.2°
Rain days
0 Rain days
Precipitation
1.7 mm
Avg. cloud cover
38 % cloudy
Sea temperature
–
Max 29.3 °C · Min 17.0 °C
2023
Avg. max23.9°Avg. min18.6°
Rain days
0 Rain days
Precipitation
1.0 mm
Avg. cloud cover
35 % cloudy
Sea temperature
–
Max 28.7 °C · Min 17.0 °C
2022
Avg. max22.7°Avg. min18.3°
Rain days
0 Rain days
Precipitation
0.9 mm
Avg. cloud cover
44 % cloudy
Sea temperature
–
Max 28.7 °C · Min 17.2 °C
2021
Avg. max21.9°Avg. min17.6°
Rain days
1 Rain days
Precipitation
3.6 mm
Avg. cloud cover
46 % cloudy
Sea temperature
–
Max 23.1 °C · Min 16.4 °C
2020
Avg. max22.5°Avg. min18.2°
Rain days
1 Rain days
Precipitation
5.4 mm
Avg. cloud cover
41 % cloudy
Sea temperature
–
Max 24.7 °C · Min 15.9 °C
2019
Avg. max22.2°Avg. min17.6°
Rain days
1 Rain days
Precipitation
6.8 mm
Avg. cloud cover
43 % cloudy
Sea temperature
–
Max 23.9 °C · Min 16.6 °C
2018
Avg. max24.3°Avg. min18.2°
Rain days
0 Rain days
Precipitation
2.0 mm
Avg. cloud cover
46 % cloudy
Sea temperature
–
Max 33.1 °C · Min 16.6 °C
2017
Avg. max22.7°Avg. min17.5°
Rain days
2 Rain days
Precipitation
7.0 mm
Avg. cloud cover
40 % cloudy
Sea temperature
–
Max 26.4 °C · Min 16.2 °C

Frequently asked questions

How warm is it in Lisbon in August?: Daytime highs averaged 23.1 °C, night-time lows 18.3 °C. The highest value of the past 10 years was 33.1 °C (3 Aug 2018), the lowest 15.9 °C (31 Aug 2020).
How often does it rain in Lisbon in August?: On average there were 0.9 rain days (at least 1 mm) with 4.8 mm of precipitation in total. In 5 of 10 years there was no rain day at all.

Check your exact travel dates

Choose your travel period – we show the weather for exactly those days.

Data sources

Weather data: Data obtained from the NASA Langley Research Center (LaRC) POWER Project funded through the NASA Earth Science/Applied Science Program
Reanalysis (weather model constrained by observations) on a coarse grid of about 50 km. Values represent a large area and can differ from local conditions, especially on islands, coasts and in mountains. No sunshine duration.
Reanalysis (weather model constrained by observations)
Reanalysis values represent a grid cell (approx. 25–50 km) and may differ from local measurements on coasts, islands and in mountains.
Sea temperature: MUR SST data were provided by JPL under support by NASA MEaSUREs program; accessed via NOAA CoastWatch ERDDAP
Daily multi-scale ultra-high resolution (≈ 1 km) analysis of satellite measurements (infrared, microwave) and in-situ data. Represents the foundation temperature below the daily warm surface layer. (Satellite and in-situ analysis)
Place search: Natural Earth (public domain) · GeoNames (CC BY 4.0) / OpenStreetMap (ODbL)