Porto in August

In August, Porto has 26.3 mm (1.04 in) of rain, a daily high of 27.7 °C (81.9 °F) and a daily low of 17.3 °C (63.1 °F), as 1991-2020 model estimates; figures in brackets are converted. The daily high is a model estimate, adjusted against station records.

Last updated 8 November 2026: first sourced version.

Best time to visit Porto: August meets our rule. Expect 3.3 rain days (model estimate) and days that shorten by 1 h 12 min.

What August is like in Porto

In late August, the São Bartolomeu parade of paper costumes ends in the sea. Many plunge in at Praia do Ourigo for the holy bath. Source: Câmara Municipal do Porto (Porto city council), checked 8 November 2026.
In August, garden parties with live music move around Porto's green spaces, from the Cordoaria to the Quinta do Covelo park. Source: Câmara Municipal do Porto (Porto city council), checked 8 November 2026.
On Friday and Saturday nights in August, free films play under the open sky. One night they showed at the Alameda das Fontainhas. Source: Câmara Municipal do Porto (Porto city council), checked 8 November 2026.
On August nights, families go out to see and hear the bats of Porto. One of these sessions takes place in the Parque Oriental. Source: Câmara Municipal do Porto (Porto city council), checked 8 November 2026.

How we choose these portraits

Key figures

Weather in August, 1991-2020 model estimates

Daily high: 27.7 °C (81.9 °F)
Daily low: 17.3 °C (63.1 °F)
Rain: 26.3 mm (1.04 in) in the month
Sunshine: no data

Model estimate 1991-2020, not a weather station: ERA5-Land model estimates (Copernicus), computed by City by Month for the grid cell nearest the city. Daily high and Days with rain: model estimate, adjusted against station records. Licence: CC BY 4.0. Checked 8 November 2026. How we make and test model estimates

Model estimate for the ERA5-Land grid cell at 41.1° N, 8.6° W, 6 km from the city centre point.

How we define and convert these figures

Notes. Sunshine: Not in our ERA5-Land estimates.

Daylight on 15 August 2026

Sunrise: 06:44 local time
Sunset: 20:33 local time
Day length: 13 h 49 min

Day length 1-31 August: 14 h 21 min to 13 h 09 min, -1 h 12 min.

How we compute daylight

Source: NOAA Solar Calculator equations, checked 3 October 2026.

Month by month

Each month: daily high in °C, then rain in mm, 1991-2020 model estimates.

ERA5-Land model estimates 1991-2020, as above, checked 8 November 2026.

This month against the year

Porto: August ranked against the 12 months
Measure	August	Rank
Daily high	27.7 °C	warmest
Daily low	17.3 °C	warmest
Rain	26.3 mm	2nd driest
Sunshine	no data	no data
Day length	13 h 49 min	4th longest

Equal values share a rank. How we rank months

Porto in August, on average: 3.3 rain days (1 mm or more). Model estimate, adjusted against station records.

ERA5-Land model estimates 1991-2020, as above, checked 8 November 2026.

Day length: NOAA solar equations, checked 3 October 2026.

Public holidays this month

Porto: public holidays in August 2026
Date	Holiday
15 August 2026 Saturday	Assumption Day diariodarepublica.pt

Typed from the official list and re-checked, 2 October 2026.

August 2027: no data. No official page gives the 2027 Easter and Corpus Christi dates yet.

English names are from the holidays library where the official list gives none. How we check holidays

Source: Official public holiday list (dgaj.justica.gov.pt), checked 2 October 2026; holidays Python library, checked 3 October 2026. Library: holidays 0.105.

Same month in 8 model-estimate cities

Porto is warmer than 2 of our 8 model-estimate cities in August by mean daily high. How we rank cities

Closest high and low in August: Lisbon (1.1 °C apart), Istanbul (2.8), Mumbai (4.5).

August in 8 model-estimate cities: daily high and low, monthly rain, 1991-2020 model estimates. Bars: high and low share one scale, coldest to warmest city; rain starts at zero.
City	Gap from Porto, °C	High, °C	Low, °C	Rain, mm	Sunshine, hours
Porto (this page)	—	27.7	17.3	26.3	no data
Lisbon (closest)	1.1	28.1	19.0	5.8	no data
Istanbul (closest)	2.8	29.1	21.4	23.7	no data
Mumbai (closest)	4.5	28.9	25.1	no data	no data
Bangkok	6.6	32.6	25.6	no data	no data
Delhi	7.4	33.7	26.0	no data	no data
Sydney	8.2	18.9	9.7	50.3	no data
Melbourne	11.5	15.3	6.7	59.5	no data

Sources (1991-2020): ERA5-Land model estimates, checked 8 November 2026. Each city's page names its grid cell. All sources in full on Methodology.

All cities in August

Sources

Attribution: Copernicus Climate Change Service (2025): ERA5 Land hourly time-series data from 1950 to present. Copernicus Climate Change Service (C3S) Climate Data Store (CDS). DOI: 10.24381/ee82e357. Accessed on the check date shown. Generated using or contains modified Copernicus Climate Change Service information 2025. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains. Licence: CC BY 4.0. Checked 8 November 2026.
NOAA Solar Calculator equations, computed locally, NOAA Global Monitoring Laboratory (method); City by Month (computation). Attribution: Computed with the NOAA Solar Calculator method (no NOAA endorsement implied). Licence: Method, not data. Checked 3 October 2026.
holidays Python library, run locally. Attribution: holidays library, Vacanza team. Licence: MIT. Checked 3 October 2026.

Official sources

Official public holiday list (dgaj.justica.gov.pt). Checked 2 October 2026.

Cite this page: City by Month. "Porto in August: weather, daylight, holidays". https://citybymonth.com/cities/portugal/porto/august/. Last updated 8 November 2026.