Bonito weather in December
December in Bonito: sweltering, soaked, with clean air — a gamble, with 17 rainy days.
Updated September 2026 · climate normals from ERA5 reanalysis
#12 of 12 months in Bonito · #1027 of 1413 destinations to visit in December · comfort 57/100 (tier D)
- Days
- 32°C
- Nights
- 23°C
- Wet days
- 17
- Sun
- 11.1 h
- Humidity
- 74%
- Daylight
- 13 h
Traveller notes on Bonito in December
Other months in Bonito
Bonito forum threads describe December through February as peak rainy season here, with waterfalls running at their fullest but river water sometimes losing some of the crystal clarity Bonito is famous for at other times of year. Counterintuitively, posters noted January/February also bring the strongest sun angle, which actually benefits underwater visibility for floating and diving in the region's spring-fed rivers despite the higher rain chance. This window is also Brazil's peak domestic summer travel season, so bigger crowds at the main river and cave attractions were a consistent theme alongside the weather discussion.
Forum posters describe June-July as dry season and Brazilian winter here, but genuinely mild rather than cold - daytime temperatures commonly around 26C and rarely dropping below 18C even at the coolest. Posters name this dry stretch (April-September) as the best window for the region's famous river activities: water clarity is at its best (described as crystalline) and wildlife concentrates visibly along the riverbanks, making boat trips for animal spotting particularly rewarding. July does bring more visitors thanks to Brazil's mid-year school holidays, but posters consistently describe it as busier rather than genuinely crowded, with a pleasant rather than overwhelming atmosphere even during this bump in tourism.
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Bonito climate normals — December
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Bonito in December
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.
BusySummer holidays in Brazil, school holidays in 3 of the markets that fill it(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Bonito'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 weatherBonito's weather peaks June–August, best around July.
Best weatherFair weatherToughest weather
What's on in Bonito in December
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Rule
Every attraction sold by voucher
1 Jan – 31 DecBook earlyNothing here is bought at the gate. Each river, cave and waterfall is sold through an accredited agency as a dated voucher with a guide and a daily visitor cap, so a two-day trip has to be booked before you arrive. Source ↗
- Season
Rain clouds the rivers
15 Nov – 15 Mar · usuallyHigh waterClosuresThe springs run glass-clear most of the year, but one heavy summer storm puts silt into the Prata and the Sucuri and the snorkelling floats are called off for a day or two afterwards. Agencies rebook rather than refund.
- Nature
Sunbeam into the Gruta do Lago Azul
15 Dec – 15 Jan · usuallyDark-sky seasonBook earlyFor a few weeks around the solstice the low morning sun drops straight through the cave mouth and lights the lake from underneath. It only works in the first slots of the day, and those go first.
Where is Bonito?
Bonito in December — FAQ
- Is December a good time to visit Bonito?
- December in Bonito: sweltering, soaked, with clean air — a gamble, with 17 rainy days. It ranks #12 of 12 months for Bonito on SeasonMap's comfort score (57/100).
- What is the weather like in Bonito in December?
- In December, Bonito averages a daily high of 31.9°C and a low of 23.4°C, with about 196.3 mm of rain over roughly 16.9 rainy days.
- What is the air quality in Bonito in December?
- Bonito has a mean US Air Quality Index of about 31 in December.