Alter do Chão weather in July
July in Alter do Chão: sweltering, rainy, with clean air — fine if you can take 35°C afternoons.
Updated September 2026 · climate normals from ERA5 reanalysis
#3 of 12 months in Alter do Chão · #465 of 1413 destinations to visit in July · comfort 85/100 (tier A)
- Days
- 31°C
- Nights
- 25°C
- Wet days
- 14
- Sun
- 10.5 h
- Humidity
- 77%
- Daylight
- 12 h
Traveller notes on Alter do Chão in July
Other months in Alter do Chão
Amazon-region forum threads describe January as squarely within what locals call the Amazonian 'winter' - the wet season - with genuinely heavy rain possible, though posters were consistent that it's very unusual for rain to fall the entire day; sun typically breaks through at some point. That said, one thread specifically warned that during the peak of the rainy season the surrounding area can flood, and recommended the dry season (roughly July through December, aligned with the Southern Hemisphere's drier months) instead for anyone prioritizing accessible trails and beaches over the lush, high-water river scenery January brings.
Forum posters describe September as squarely inside the Amazon's dry season - locally called 'summer,' running roughly July to December - which is also when Alter do Chao's famous river-sand beaches along the Tapajos emerge as water levels drop. Visitor reports from within this dry stretch describe delightful, warm conditions and calm, low water levels ideal for beach time and swimming, in contrast to the wetter 'winter' months when the river rises and submerges the beaches entirely. Posters treat the dry season generally, and September specifically, as the reliable window to actually see and enjoy the riverside beaches this destination is known for, rather than a hit-or-miss gamble on water levels.
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Alter do Chão climate normals — July
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Alter do Chão in July
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.
Peak crowdsFestival Borari, July winter break in Brazil, school holidays in 3 of the markets that fill it(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Alter do Chão'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).
Best weatherAlter do Chão's weather peaks July–September, best around August.
July includes Festival Borari.
Best weatherFair weatherToughest weather
What's on in Alter do Chão in July
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
High water on the Tapajós
1 Feb – 31 Jul · usuallyFrom February the river swallows the sand and the shoreline becomes flooded forest reached by canoe. The village is at its emptiest and cheapest, and the beach everyone comes for is not there.
- Festival
Festival Borari
10–25 Jul · usuallyMajor festivalCrowdedThe Borari indigenous association stages three nights of dances, re-enacted rituals and regional food in the village in mid-July, just as the school holidays bring Santarém out to the beaches. Source ↗
Where is Alter do Chão?
Alter do Chão in July — FAQ
- Is July a good time to visit Alter do Chão?
- July in Alter do Chão: sweltering, rainy, with clean air — fine if you can take 35°C afternoons. It ranks #3 of 12 months for Alter do Chão on SeasonMap's comfort score (85/100).
- What is the weather like in Alter do Chão in July?
- In July, Alter do Chão averages a daily high of 30.6°C and a low of 24.5°C, with about 95.9 mm of rain over roughly 13.5 rainy days.
- What is the air quality in Alter do Chão in July?
- Alter do Chão has a mean US Air Quality Index of about 31 in July.