8.7· 3 reviews
Tapajós National Forest Tour
Venture into the Brazilian rainforest and discover the animals that live there on our 1 or 2-day Tapajós National Forest Tour.
2 days
from US$ 77
Short answer
The best time to visit Alter do Chão is from August to November. The most comfortable month is October, with highs of 33 °C (91 °F) and 54 mm of rain over 5 days. March is the rainiest month (383 mm over 22 days), and the summer peak is the high season, with higher prices and big crowds.
Source: INMET (updated 2026)
When to go
Best time to visit, month by month
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Best window: August to November More rain / less comfortable Comfort index · INMET (updated 2026)
Alter do Chão month by month
Temperature and rainfall averages from INMET (updated 2026). The verdict combines thermal comfort and rainfall. Tap a month to see the weather, crowds, prices and what is going on in detail.
| Month | High / Low | Rain | Rainy days | Verdict |
|---|---|---|---|---|
| January | 31° / 22° | 194 mm | 16 | Best avoided |
| February | 30° / 22° | 274 mm | 18 | Best avoided |
| March | 30° / 22° | 383 mm | 22 | Best avoided |
| April | 30° / 22° | 347 mm | 21 | Best avoided |
| May | 30° / 22° | 274 mm | 22 | Best avoided |
| June | 31° / 22° | 152 mm | 16 | Best avoided |
| July | 31° / 21° | 130 mm | 12 | Best avoided |
| August | 32° / 22° | 64 mm | 8 | Fair |
| September | 32° / 22° | 58 mm | 7 | Fair |
| October ★ | 33° / 22° | 54 mm | 5 | Good |
| November | 33° / 23° | 71 mm | 5 | Good |
| December | 32° / 22° | 120 mm | 10 | Fair |
Best month
October
Driest month
October
Avoid (more rain)
March
Tours and tickets
Things to do in Alter do Chão
Where to stay
Hotels in Alter do Chão
October is the best month and also falls in the high season in Alter do Chão: the top-rated hotels fill up and rates rise close to the date. Book your room as soon as you have settled on your dates.
Rates change with the dates: confirm the price on Booking.com.
The weather in Alter do Chão throughout the year
The August to November window brings together the most comfortable months in Alter do Chão: less rain and pleasant temperatures. October is usually the best month, with highs of 33 °C (91 °F), lows of 22 °C (72 °F) and only about 5 days of rain in the month: good conditions for enjoying outdoor attractions with less risk of downpours.
Summer. In summer (December to February), Alter do Chão has highs of around 31 °C (88 °F) and lows of 22 °C (72 °F), and it is the wetter season, with about 196 mm of rain spread over about 15 days a month. The days are hot and call for beach time and shade.
Fall. In fall (March to May), Alter do Chão has highs of around 30 °C (86 °F) and lows of 22 °C (72 °F), and it is the wetter season, with about 335 mm of rain spread over about 22 days a month. The days are hot and call for beach time and shade.
Winter. In winter (June to August), Alter do Chão has highs of around 31 °C (88 °F) and lows of 22 °C (72 °F), and it is the wetter season, with about 115 mm of rain spread over about 12 days a month. The days are hot and call for beach time and shade.
Spring. In spring (September to November), Alter do Chão has highs of around 33 °C (91 °F) and lows of 22 °C (72 °F), and it is the driest time of year, with about 61 mm of rain a month. The days are hot and call for beach time and shade.
What to avoid
There are two periods to think twice about before booking. March is usually the rainiest month, so anyone who prioritizes sun should avoid it. The other is high season (New Year's Eve, Carnival and the July school break), when attractions fill up and prices rise; if you want peace and savings, choose weeks without public holidays. None of this rules out the trip, but it changes the experience and the cost quite a bit.