Monthly climate guide
Rio Branco weather in December
With highs near 29°C (84°F) and lows around 23°C (74°F), December feels hot in Rio Branco. Rainfall averages about 208 mm (very wet) and the sky is often cloudy. Daytime highs are 2°C cooler than November and about the same as January.
What stands out in December
- This is rainy-season territory in Rio Branco: short, heavy downpours are typical.
- Rain is above Rio Branco's usual level, by about 51%.
- Nights stay warm, rarely below 23°C — air-conditioning helps.
- Humidity near 90% makes 29°C feel stickier than it sounds.
Avg high
29°C
84°F
Avg low
23°C
74°F
Rainfall
208 mm
very wet
Humidity
90%
relative
Sky
83%
cloud · often cloudy
Rio Branco weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 28°C / 83°F | 23°C / 73°F | 254 mm | 92% | 87% |
| February | 28°C / 83°F | 23°C / 73°F | 241 mm | 93% | 88% |
| March | 28°C / 83°F | 23°C / 73°F | 242 mm | 93% | 85% |
| April | 28°C / 82°F | 23°C / 73°F | 147 mm | 92% | 73% |
| May | 28°C / 82°F | 22°C / 71°F | 80 mm | 91% | 61% |
| June | 28°C / 83°F | 21°C / 70°F | 38 mm | 88% | 45% |
| July | 30°C / 86°F | 20°C / 68°F | 20 mm | 79% | 36% |
| August | 33°C / 91°F | 21°C / 70°F | 44 mm | 69% | 44% |
| September | 34°C / 94°F | 23°C / 73°F | 78 mm | 69% | 59% |
| October | 33°C / 92°F | 24°C / 74°F | 115 mm | 73% | 79% |
| November | 31°C / 88°F | 24°C / 74°F | 189 mm | 81% | 81% |
| December | 29°C / 84°F | 23°C / 74°F | 208 mm | 90% | 83% |
What to pack for December
- Light, breathable clothing (cotton or linen)
- A sun hat and high-SPF sunscreen
- A refillable water bottle
- A compact umbrella or packable rain jacket
- Water-resistant shoes
- Quick-dry fabrics — it feels stickier than the temperature suggests
Is December a good time to visit Rio Branco?
Compare the months in the chart above to find your ideal window.
Best time to visit Rio Branco →Other Brazil cities in December
Cite or embed this data
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Rio Branco weather in December. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/brazil/rio-branco/december
<a href="https://weathercompare.eu/weather/brazil/rio-branco/december">Rio Branco weather in December</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/brazil/rio-branco" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Rio Branco weather in December"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/brazil/rio-branco/december">Rio Branco weather in December</a> – WeatherCompare</p>
Rio Branco in December: quick answers
Is December a good time to visit Rio Branco?
December is one of the wetter months in Rio Branco, with about 208 mm of rain. You can still go: pack a rain jacket and keep plans flexible.
How warm is Rio Branco in December?
Average highs are about 29°C (84°F) and average lows about 23°C (74°F), based on 10 years of daily data.
Does it rain a lot in Rio Branco in December?
Rio Branco typically gets around 208 mm of rain in December — very wet.
Figures are long-term averages for the area around Rio Branco (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.