SeasonMapAlter do Chão weather in March
Brazil
March in Alter do Chão: sweltering, soaked, with clean air — a gamble, with 28 rainy days.
#12 of 12 months in Alter do Chão · #1225 of 1383 destinations to visit in March · comfort 57/100 (tier D)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Alter do Chão in March
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Alter do Chão climate normals — March
| Daytime high | 30°C / 85°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 25°C / 77°F | |
| Feels like (high) | 35°C / 95°F | |
| Rainfall | 442 mm / 17.4 in | ⛈ soaked |
| Rainy days | 28 days | |
| Humidity | 82% | 💦 very humid |
| Dew point | 24°C / 76°F | |
| Sunshine | 8.2 h/day | |
| Daylight | 12.1 h | |
| Wind | 14 km/h / 9 mph | |
| Air quality (US AQI) | 31 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Alter do Chão in March
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.
Quietschool holidays in 3 of the markets that fill it, one of its worst months for weather(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).
Toughest weatherAlter do Chão's weather peaks July–September, best around August.
Best weatherFair weatherToughest weather
What's on in Alter do Chão in March
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.
- Season
Wet season
MonsoonRisk28 rainy days and about 442 mm in the month — the real kind of rainy season, not afternoon showers.
from the climate normals
Where is Alter do Chão?
Alter do Chão in March — FAQ
- Is March a good time to visit Alter do Chão?
- March in Alter do Chão: sweltering, soaked, with clean air — a gamble, with 28 rainy days. It ranks #12 of 12 months for Alter do Chão on SeasonMap's comfort score (57/100).
- What is the weather like in Alter do Chão in March?
- In March, Alter do Chão averages a daily high of 29.5°C and a low of 25.1°C, with about 442.4 mm of rain over roughly 28.4 rainy days.
- What is the air quality in Alter do Chão in March?
- Alter do Chão has a mean US Air Quality Index of about 31 in March.