Rio Branco weather by month

Warmest month

September

35°C average high

Coolest month

July

22°C average low

Wettest month

December

171 mm of rain

Driest month

June

14 mm of rain

Average temperature and rainfall in Rio Branco by month

Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.

Month	Avg high	Avg low	Record low / high	Rainfall	Humidity	Wind
January	30°C	23°C	22°C / 35°C	164 mm	85%	5 km/h
February	31°C	23°C	22°C / 39°C	141 mm	87%	5 km/h
March	31°C	24°C	21°C / 34°C	149 mm	86%	5 km/h
April	32°C	24°C	21°C / 36°C	151 mm	85%	5 km/h
May	31°C	23°C	18°C / 34°C	52 mm	82%	5 km/h
June	32°C	22°C	15°C / 36°C	14 mm	75%	5 km/h
July	34°C	22°C	19°C / 38°C	15 mm	68%	5 km/h
August	35°C	23°C	17°C / 39°C	15 mm	65%	5 km/h
September	35°C	23°C	17°C / 39°C	43 mm	70%	5 km/h
October	34°C	24°C	21°C / 38°C	74 mm	76%	5 km/h
November	32°C	24°C	19°C / 38°C	151 mm	81%	5 km/h
December	31°C	24°C	22°C / 35°C	171 mm	85%	5 km/h

Frost and snow-likely months in Rio Branco

No month in Rio Branco averages a night of 2°C or below. The coldest month is July with an average low of 22°C and a record low of 19°C, so frost is rare and snow is very unlikely.

These records carry temperature and precipitation, not snowfall totals.

Best time to visit Rio Branco

The most comfortable time to visit Rio Branco is generally May to July, balancing mild daytime temperatures against the driest stretch of the year. Temperatures stay fairly even all year and rain concentrates around December, totalling about 1,141 mm a year.

Travellers who prefer heat should aim for September, when highs average 35°C. December is the month to avoid if rain would spoil your plans — it averages 171 mm, roughly 12× the rainfall of the driest month (June).

Rio Branco climate: your questions

Will it snow in Rio Branco this year?

No: the coldest month in Rio Branco is July with an average low of 22°C and a record low of 19°C, so snow is very unlikely. What is falling now: Rio Branco weather today.

When is the best time to visit Rio Branco?

May to July are the most comfortable months in Rio Branco, with highs near 32°C. September is the warmest month, averaging 35°C by day; December is the wettest, with 171 mm; and July is the coolest, with lows near 22°C. What it is doing today: Rio Branco weather today.

Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Rio Branco forecast for what is happening now.