SeasonMapAlter do Chão weather in October
Brazil
October in Alter do Chão: sweltering, rainy — fine if you can take 38°C afternoons.
#4 of 12 months in Alter do Chão · #446 of 1383 destinations to visit in October · comfort 82/100 (tier A)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Alter do Chão in October
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Alter do Chão climate normals — October
| Daytime high | 33°C / 91°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 26°C / 79°F | |
| Feels like (high) | 38°C / 100°F | |
| Rainfall | 81 mm / 3.2 in | 🌧 rainy |
| Rainy days | 11 days | |
| Humidity | 70% | 💧 humid |
| Dew point | 24°C / 75°F | |
| Sunshine | 10.7 h/day | |
| Daylight | 12.2 h | |
| Wind | 15 km/h / 10 mph | |
| Air quality (US AQI) | 55 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Alter do Chão in October
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.
BusyRiver beaches emerge(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).
Fair weatherAlter do Chão's weather peaks July–September, best around August.
Best weatherFair weatherToughest weather
What's on in Alter do Chão in October
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
River beaches emerge
1 Aug – 31 Jan · usuallyHigh waterCrowdedThe Tapajós drops from August and the white sandbanks in front of the village come back out of the water. By September you can wade to the Ilha do Amor, and in a hard year walk to it.
Where is Alter do Chão?
Alter do Chão in October — FAQ
- Is October a good time to visit Alter do Chão?
- October in Alter do Chão: sweltering, rainy — fine if you can take 38°C afternoons. It ranks #4 of 12 months for Alter do Chão on SeasonMap's comfort score (82/100).
- What is the weather like in Alter do Chão in October?
- In October, Alter do Chão averages a daily high of 32.7°C and a low of 26.1°C, with about 80.9 mm of rain over roughly 10.7 rainy days.
- What is the air quality in Alter do Chão in October?
- Alter do Chão has a mean US Air Quality Index of about 55 in October.