Weather in Porto Alegre in July

A good month. July works. It is not the peak, but nothing about it fights you. Highs average 18.8 °C, lows 9.1 °C, and rain falls on 11 days — nothing in the month is working against you.

July ranks 6 of 12 in Porto Alegre: past the worst of the year but short of April, which is the month to book if the dates are open.

The rain arrives in bursts — 5 of the 11 wet days are heavy ones. Mornings tend to hold; build the outdoor half of each day before lunch and keep the afternoon flexible. Nothing specialised needed — this is the month you pack for the trip rather than for the weather.

What the averages hide

Averages flatten a month, and this one hides a few things: it never really gets hot: not one day in an average July reaches 30 °C. Across the twenty years measured, the hottest July day reached 29.1 °C and the coldest night fell to -1.7 °C, and the wettest single day dropped 94 mm — roughly 63% of the month's rain in one day.

July is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest July on record still delivered 278 mm against 23 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 149 mm average is a reasonable planning figure, not a promise.

Wind is light at 7.6 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 86%, high enough to notice on the warm days without dominating them.

How July sits in the year

Temperatures hold steady either side: 19.4 °C in June, 18.8 here, 20.6 in August. Nothing about the timing within the month matters much.

Daylight in July

July sits at the dark end of Porto Alegre's year — 10.4 hours of daylight against 14.1 at midsummer, gaining 0.4 hours across the month. Sightseeing days are genuinely shorter, and an itinerary built for summer will not fit.

Sea temperature

The sea sits at about 16.8 °C in July — cold — a quick dip rather than a swim, and a wetsuit if you are in for longer. The sea peaks at 25.3 °C in February and bottoms out at 16.5 °C — water lags the air by a month or two, which is why the best swimming often comes after the best weather.

How busy it gets

Peak season. Expect the highest prices of the year and to be booking well ahead. If the dates are flexible, September is the trade worth considering — 6 points weaker on weather, and materially quieter.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

July in Porto Alegre versus nearby

If Porto Alegre is one option among several, the nearby comparison is worth making. Curitiba is close enough to be a coin toss — within a degree on temperature, 1 day less rain. São Paulo is a better bet in July — 3.7 °C warmer, 4 days less rain.

So: July is effectively as good as it gets here — 6 points behind April, which is inside the margin where the weather stops being the deciding factor and price starts being it.

Every month in Porto Alegre

See all twelve months in Porto Alegre, or where else to go in July.