Porto Alegre weather in August

August in Porto Alegre: nice, rainy, with clean air — one of the best months to visit.

Updated September 2026 · climate normals from ERA5 reanalysis

Porto Alegre🇧🇷 Brazil · Southern Brazil & Iguazú · City85
  1. 73Jan
  2. 73Feb
  3. 74Mar
  4. 81Apr
  5. 78May
  6. 78Jun
  7. 79Jul
  8. 85Aug
  9. 81Sep
  10. 84Oct
  11. 81Nov
  12. 76Dec

#1 of 12 months in Porto Alegre · #476 of 1413 destinations to visit in August · comfort 85/100 (tier A)

Days
22°C
Nights
11°C
Wet days
10
Sun
7.8 h
Humidity
80%
Daylight
11 h
Porto Alegre, Brazil
Photo: Maria Lucia P. Sampaio · Pexels

Traveller notes on Porto Alegre in August

Notes from nearby Gramado (80 km away)

Porto Alegre doesn't have its own notes for August yet — these are about Gramado, close enough to share the season.

Gramado's forum is clear this is genuine winter in Brazil's hill country - temperatures for July and August described in a wide 0-18C range depending heavily on whether a cold front is blowing up from Argentina that particular week. One practical heads-up from regulars: mid-August gets unusually crowded and expensive because of the town's film festival, so hotel prices spike independent of the weather itself. The wider vineyard region nearby stays in the same cold-winter pattern through the end of the month, which is exactly why this hilly corner of Rio Grande do Sul markets itself as Brazil's cozy winter getaway.
SerraGauchaRegular · August · 1 month ago · about Gramado · Read more on Tripadvisor ↗

Other months in Porto Alegre

Forum posters generally rate October as one of Brazil's best weather months as spring gets underway, though real rain remains part of the seasonal transition. Posters describe Porto Alegre, in Brazil's far south, as running colder than most of the rest of the country, comparable to or cooler than Curitiba depending on the specific stretch of weather. Given the limited destination-specific detail available for October exactly, this note leans on that broader southern-Brazil pattern: expect mild, spring-like temperatures with a real chance of rain, cooler overall than the tropical conditions typical of Brazil's more northern cities. Posters generally rate October as a comfortable, moderate-temperature time to visit Porto Alegre, appropriate layers still worth packing.
Tripadvisor community · October · 1 month ago · Read more on Tripadvisor ↗
Forum posters describe Rio Grande do Sul's climate as running genuinely cold in winter (0-18C in July/August) and hot in summer (up to 30C December-March), placing April into the autumn transition between those extremes - noticeably milder than deep summer but not yet into winter's chill. The nearby hill town of Gramado (a popular 2-3 hour day trip from Porto Alegre, known for its European-colonized, alpine-style architecture) is specifically called out as already turning cold by the September-October shoulder months given its higher elevation, a pattern posters say applies similarly heading into April from the other side of the year. Posters treat the shoulder-season months generally as a comfortable, less extreme alternative to visiting in the depths of either Porto Alegre's hot summer or cold winter.
Tripadvisor community · April · 1 month ago · Read more on Tripadvisor ↗

Add your own note from Porto Alegre's card on the map.

Porto Alegre climate normals — August

Daytime high22°C / 72°F😎 nice
Nighttime low11°C / 53°F
Feels like (high)22°C / 72°F
Rainfall90 mm / 3.6 in🌧 rainy
Rainy days10 days
Humidity80%💦 very humid
Dew point12°C / 54°F
Sunshine7.8 h/day
Daylight11.1 h
Wind16 km/h / 10 mph
Air quality (US AQI)48🍃 good

Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.

Crowds in Porto Alegre in August

How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.

BusyAcampamento Farroupilha(estimated)

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Peak crowdsBusyShoulder seasonQuiet

Best months for Porto Alegre's weather

Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).

Fair weatherPorto Alegre's weather doesn't swing hard through the year — comfort stays fairly steady in every month.

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What's on in Porto Alegre in August

Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.

  • Season

    Minuano behind the fronts

    15 May – 31 Aug · usuallyWind seasonRisk

    Cold fronts cross the state through winter and the southwest minuano follows each one: a clear, dry, hard wind for a day or two that empties the parks and puts a chop on the Guaiba.

  • Festival

    Acampamento Farroupilha

    29 Aug – 20 SepMajor festivalCrowded

    Hundreds of piquetes go up in Parque Harmonia for three weeks of fires, churrasco and gaucho music, free to walk into, closing with the ride through the centre on 20 September. Source ↗

What's on around the world in August →

Where is Porto Alegre?

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Porto Alegre in August — FAQ

Is August a good time to visit Porto Alegre?
August in Porto Alegre: nice, rainy, with clean air — one of the best months to visit. It ranks #1 of 12 months for Porto Alegre on SeasonMap's comfort score (85/100).
What is the weather like in Porto Alegre in August?
In August, Porto Alegre averages a daily high of 22°C and a low of 11.4°C, with about 90.4 mm of rain over roughly 9.8 rainy days.
What is the air quality in Porto Alegre in August?
Porto Alegre has a mean US Air Quality Index of about 48 in August.