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São Sebastião Whale Watching
São Sebastião offers one of the best spots in Brazil to see humpback whales, making this crossing a must for anyone visiting the region.
4 h
from US$ 102
Short answer
The best time to visit São Sebastião is from May to August. The most comfortable month is June, with highs of 25 °C (77 °F) and 94 mm of rain over 7 days. January is the rainiest month (313 mm over 17 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: May to August More rain / less comfortable Comfort index · INMET (updated 2026)
São Sebastião 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 | 30° / 22° | 313 mm | 17 | Best avoided |
| February | 31° / 22° | 291 mm | 15 | Best avoided |
| March | 30° / 21° | 311 mm | 16 | Best avoided |
| April | 28° / 19° | 233 mm | 13 | Fair |
| May | 26° / 16° | 123 mm | 9 | Good |
| June ★ | 25° / 15° | 94 mm | 7 | Good |
| July | 24° / 14° | 93 mm | 8 | Good |
| August | 25° / 14° | 74 mm | 8 | Good |
| September | 25° / 16° | 197 mm | 13 | Fair |
| October | 26° / 18° | 246 mm | 15 | Fair |
| November | 28° / 19° | 264 mm | 16 | Fair |
| December | 29° / 20° | 280 mm | 17 | Fair |
Best month
June
Driest month
August
Avoid (more rain)
January
Tours and tickets
Things to do in São Sebastião
Where to stay
Hotels in São Sebastião
June is the best month and also falls in the high season in São Sebastião: 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 São Sebastião throughout the year
The May to August window brings together the most comfortable months in São Sebastião: less rain and pleasant temperatures. June is usually the best month, with highs of 25 °C (77 °F), lows of 15 °C (59 °F) and only about 7 days of rain in the month: good conditions for enjoying outdoor attractions with less risk of downpours.
Summer. In summer (December to February), São Sebastião has highs of around 30 °C (86 °F) and lows of 21 °C (70 °F), and it is the wetter season, with about 295 mm of rain spread over about 16 days a month. The days are hot and call for beach time and shade.
Fall. In fall (March to May), São Sebastião has highs of around 28 °C (82 °F) and lows of 19 °C (66 °F), and it is the wetter season, with about 222 mm of rain spread over about 13 days a month. The days are hot and call for beach time and shade.
Winter. In winter (June to August), São Sebastião has highs of around 25 °C (77 °F) and lows of 14 °C (57 °F), and it is the wetter season, with about 87 mm of rain spread over about 8 days a month. Temperatures are pleasant for sightseeing all day.
Spring. In spring (September to November), São Sebastião has highs of around 26 °C (79 °F) and lows of 18 °C (64 °F), and it is the wetter season, with about 236 mm of rain spread over about 15 days a month. Temperatures are pleasant for sightseeing all day.
What to avoid
There are two periods to think twice about before booking. January 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.