SeasonMapAlter do Chão weather in May
Brazil
May in Alter do Chão: warm, soaked, with clean air — a gamble, with 29 rainy days.
#8 of 12 months in Alter do Chão · #1133 of 1383 destinations to visit in May · comfort 63/100 (tier C)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Alter do Chão in May
No notes yet. Open Alter do Chão on the map to add the first one.
Alter do Chão climate normals — May
| Daytime high | 29°C / 84°F | 🌤 warm |
|---|---|---|
| Nighttime low | 26°C / 79°F | |
| Rainfall | 337 mm / 13.2 in | ⛈ soaked |
| Rainy days | 29 days | |
| Humidity | 81% | 💦 very humid |
| Dew point | 24°C / 75°F | |
| Sunshine | 9.1 h/day | |
| Daylight | 12 h | |
| Wind | 13 km/h / 8 mph | |
| Air quality (US AQI) | 30 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Alter do Chão in May
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.
Shoulder seasonan ordinary month(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 weatherFair weatherToughest weather
What's on in Alter do Chão in May
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
MonsoonRisk29 rainy days and about 337 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 May — FAQ
- Is May a good time to visit Alter do Chão?
- May in Alter do Chão: warm, soaked, with clean air — a gamble, with 29 rainy days. It ranks #8 of 12 months for Alter do Chão on SeasonMap's comfort score (63/100).
- What is the weather like in Alter do Chão in May?
- In May, Alter do Chão averages a daily high of 28.7°C and a low of 26°C, with about 336.5 mm of rain over roughly 28.6 rainy days.
- What is the air quality in Alter do Chão in May?
- Alter do Chão has a mean US Air Quality Index of about 30 in May.