Porto Velho climate

Name: Porto Velho
Address: BR

Porto Velho is warmest in August, with average highs of 33 °C, and coldest in July, when nights average 22 °C. March is the wettest month (336 mm) and July the driest (23 mm). Figures are 1991–2020 climate normals.

Across a full year Porto Velho averages 2,303 mm of rain and 364 days above 25 °C.

Brazil · population 548,952 · 1991–2020 normals

Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month

Warmest month August 33 °C
Coldest month July 22 °C
Driest month July 23 mm
Wettest month March 336 mm
Least cloud July 36 % cloud
Hottest on record August 38 °C
Coldest on record July 14 °C

What to expectPorto Velho through the year

Porto Velho changes little through the year. Average daily highs stay between 31 and 33 °C, so no month stands out as a season in the way it would further from the equator.

Counted across a normal year, 364 days a year reach 25 °C, 197 of them reach 30 °C. The warmest reading in the 1991–2020 record is 38 °C, in August.

Rain is strongly seasonal. March averages 336 mm against 23 mm in July — 14 times as much. Planning around the dry months matters more here than planning around temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	29.5 °C	315 mm	91 %
February	29.4 °C	319 mm	92 %
March	29.2 °C	336 mm	92 %
April	29.2 °C	242 mm	88 %
May	29.0 °C	142 mm	77 %
June	29.7 °C	46 mm	53 %
July	31.2 °C	23 mm	36 %
August	32.8 °C	43 mm	41 %
September	32.5 °C	102 mm	62 %
October	31.7 °C	176 mm	79 %
November	30.3 °C	255 mm	88 %
December	29.7 °C	303 mm	90 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C
January	29.5 °C	23.4 °C	25.7 °C	34.6 °C	21.8 °C	31	13
February	29.4 °C	23.3 °C	25.6 °C	33.5 °C	21.3 °C	28	11
March	29.2 °C	23.4 °C	25.5 °C	33.4 °C	21.4 °C	31	10
April	29.2 °C	23.3 °C	25.5 °C	33.1 °C	18.0 °C	30	9
May	29.0 °C	22.9 °C	25.3 °C	32.5 °C	16.9 °C	31	7
June	29.7 °C	22.3 °C	25.4 °C	33.4 °C	15.3 °C	30	13
July	31.2 °C	21.9 °C	25.9 °C	36.1 °C	14.4 °C	31	23
August	32.8 °C	22.8 °C	27.1 °C	38.0 °C	15.4 °C	31	28
September	32.5 °C	23.7 °C	27.3 °C	36.7 °C	17.0 °C	30	26
October	31.7 °C	23.9 °C	27.0 °C	37.0 °C	21.0 °C	31	25
November	30.3 °C	23.7 °C	26.2 °C	35.1 °C	18.8 °C	30	18
December	29.7 °C	23.6 °C	25.9 °C	33.4 °C	20.8 °C	31	14

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	315 mm	29	13 h/day	91 %	90 %	8.1 km/h
February	319 mm	27	12 h/day	92 %	91 %	7.9 km/h
March	336 mm	29	12 h/day	92 %	92 %	7.5 km/h
April	242 mm	26	12 h/day	88 %	91 %	7.4 km/h
May	142 mm	21	12 h/day	77 %	89 %	7.6 km/h
June	46 mm	9	12 h/day	53 %	85 %	7.7 km/h
July	23 mm	5	12 h/day	36 %	76 %	8.4 km/h
August	43 mm	7	12 h/day	41 %	71 %	8.8 km/h
September	102 mm	16	12 h/day	62 %	79 %	8.4 km/h
October	176 mm	22	12 h/day	79 %	85 %	8.0 km/h
November	255 mm	26	13 h/day	88 %	89 %	7.8 km/h
December	303 mm	28	13 h/day	90 %	90 %	8.0 km/h

Where Porto Velho ranks

Ranking	Position	Value
The warmest places in South America in August	31stof 50	33 °C
The warmest places in South America in July	34thof 50	31 °C
The warmest places in South America in September	35thof 50	32 °C
The warmest places in South America in October	39thof 50	32 °C
The warmest places in South America in November	41stof 50	30 °C

Planning a trip? See the best time to visit Porto Velho.

QuestionsCommon questions about Porto Velho’s climate

When is the best time to visit Porto Velho?

That depends on what you want, so the honest answer is a comparison rather than a single month. April, May, June sit closest to 20 °C on average, August is the warmest month and July the driest. The month-by-month table above has the full picture.

How hot does Porto Velho get?

In August, the warmest month, daily highs average 33 °C. About 197 days a year pass 30 °C. The highest value in the 1991–2020 record is 38 °C.

How cold does it get in winter?

Nights average 22 °C in July, the coldest month. Freezing nights are not part of a normal year here.

Which month is wettest in Porto Velho?

March, averaging 336 mm over 29 days with rain. The driest month is July with 23 mm. The year as a whole averages 2,303 mm.

Are these figures a forecast?

No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in Porto Velho rather than what any particular week will bring. Individual years can differ substantially from the normal.

Data sources and method

ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
Open-Meteo — Open-Meteo.com. CC BY 4.0
NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
GeoNames — GeoNames.org. CC BY 4.0

Normal period: 1991–2020
Dataset version: era5-1991-2020-scores1.1
Last processed: 1 August 2026

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. Full formulas are on the methodology page.

Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.