Rio Branco Climate by Month
Rio Branco, Acre, Brazil
Hot all year, with rain spread through the year.
The climate in Rio Branco is hot all year, with rain spread through the year. Expect highs of 92°F (33°C) in September and 87°F (31°C) in February, with the coldest nights (July) near 64°F (18°C). About 68 in (1724 mm) of rain falls in a typical year, with no clear rainy season. The air is humid, averaging 82% relative humidity.
- Warmest month
- 92°F(33°C)
- Average high, September
- Coldest nights
- 64°F(18°C)
- Average low, July
- Rain per year
- 68 in(1724 mm)
- No clear rainy season
- Humidity
- 82%
- Sunniest: August
Best and worst months in Rio Branco
Best for weatherThe most comfortable weather comes from May to July, with highs around 88°F (31°C) and about 3.3 in (84 mm) of rain a month.
Least pleasantJanuary and March are the least pleasant; March is the wettest, with 8.1 in (207 mm) of rain.
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in July.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Rio Branco weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 87°F(31°C) | 72°F(22°C) | 8.0 in(204 mm) | 85% | 3.5 |
| FebFebruary | 87°F(31°C) | 71°F(22°C) | 7.8 in(199 mm) | 86% | 3.4 |
| MarMarch | 87°F(31°C) | 71°F(22°C) | 8.1 in(207 mm) | 85% | 3.4 |
| AprApril | 88°F(31°C) | 71°F(21°C) | 5.4 in(138 mm) | 85% | 3.3 |
| MayMayBest | 87°F(31°C) | 68°F(20°C) | 3.8 in(96 mm) | 83% | 3.4 |
| JunJuneBest | 87°F(31°C) | 65°F(19°C) | 3.3 in(84 mm) | 84% | 3.9 |
| JulJulyBest | 89°F(31°C) | 64°F(18°C) | 2.8 in(71 mm) | 78% | 4.2 |
| AugAugust | 92°F(33°C) | 65°F(18°C) | 3.4 in(86 mm) | 72% | 4.5 |
| SepSeptember | 92°F(33°C) | 68°F(20°C) | 5.1 in(129 mm) | 74% | 4.3 |
| OctOctober | 91°F(33°C) | 70°F(21°C) | 5.6 in(143 mm) | 79% | 3.7 |
| NovNovember | 89°F(32°C) | 71°F(21°C) | 6.9 in(175 mm) | 84% | 3.8 |
| DecDecember | 88°F(31°C) | 71°F(22°C) | 7.6 in(192 mm) | 84% | 3.4 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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