Barreiras climate

Name: Barreiras
Address: BR

Barreiras is warmest in October, with average highs of 34 °C, and coldest in July, when nights average 19 °C. November is the wettest month (155 mm) and July the driest (0.3 mm). Figures are 1991–2020 climate normals.

Across a full year Barreiras averages 846 mm of rain and 361 days above 25 °C.

Brazil · population 171,634 · 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 October 34 °C
Coldest month July 19 °C
Driest month July 0 mm
Wettest month November 155 mm
Least cloud August 30 % cloud
Hottest on record October 40 °C
Coldest on record May 14 °C

What to expectBarreiras through the year

Barreiras has a clear annual cycle: average daily highs run from 30 °C in July to 34 °C in October, a swing of 4.0 °C in mean temperature across the year.

Counted across a normal year, 361 days a year reach 25 °C, 237 of them reach 30 °C. The warmest reading in the 1991–2020 record is 40 °C, in October.

Rain is strongly seasonal. November averages 155 mm against 0 mm in July — 478 times as much. Planning around the dry months matters more here than planning around temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	30.2 °C	137 mm	70 %
February	30.1 °C	121 mm	69 %
March	30.1 °C	143 mm	70 %
April	30.1 °C	70 mm	60 %
May	30.3 °C	19 mm	51 %
June	30.1 °C	2 mm	39 %
July	30.1 °C	under 1 mm	32 %
August	31.6 °C	under 1 mm	30 %
September	33.7 °C	8 mm	34 %
October	34.0 °C	49 mm	52 %
November	31.3 °C	155 mm	73 %
December	30.6 °C	142 mm	73 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C
January	30.2 °C	21.7 °C	25.7 °C	35.6 °C	18.6 °C	30	18
February	30.1 °C	21.6 °C	25.6 °C	35.3 °C	18.5 °C	28	15
March	30.1 °C	21.6 °C	25.5 °C	35.6 °C	18.2 °C	30	16
April	30.1 °C	21.5 °C	25.6 °C	37.0 °C	17.5 °C	30	15
May	30.3 °C	20.8 °C	25.4 °C	35.1 °C	13.9 °C	31	18
June	30.1 °C	19.6 °C	24.7 °C	34.5 °C	14.1 °C	30	15
July	30.1 °C	18.8 °C	24.5 °C	34.0 °C	13.9 °C	31	16
August	31.6 °C	19.4 °C	25.6 °C	36.4 °C	15.0 °C	31	26
September	33.7 °C	21.4 °C	27.7 °C	38.4 °C	16.5 °C	30	29
October	34.0 °C	23.0 °C	28.5 °C	39.8 °C	19.1 °C	31	29
November	31.3 °C	22.4 °C	26.5 °C	38.5 °C	18.2 °C	29	20
December	30.6 °C	22.0 °C	26.0 °C	36.7 °C	18.1 °C	30	20

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	137 mm	16	13 h/day	70 %	74 %	9.9 km/h
February	121 mm	15	13 h/day	69 %	75 %	9.6 km/h
March	143 mm	16	12 h/day	70 %	76 %	9.3 km/h
April	70 mm	10	12 h/day	60 %	72 %	9.7 km/h
May	19 mm	3	12 h/day	51 %	63 %	10 km/h
June	2 mm	0	11 h/day	39 %	54 %	12 km/h
July	under 1 mm	0	11 h/day	32 %	49 %	12 km/h
August	under 1 mm	0	12 h/day	30 %	43 %	12 km/h
September	8 mm	1	12 h/day	34 %	40 %	13 km/h
October	49 mm	6	12 h/day	52 %	47 %	12 km/h
November	155 mm	14	13 h/day	73 %	66 %	11 km/h
December	142 mm	15	13 h/day	73 %	72 %	10.0 km/h

Where Barreiras ranks

Ranking	Position	Value
The warmest places in South America in October	14th of 50	34 °C
The driest places in South America in August	18th of 50	0.4 mm
The driest places in South America in July	19th of 50	0.3 mm
The warmest places in South America in November	23rd of 50	31 °C
The driest places in South America in June	25th of 50	1.8 mm
The warmest places in South America in September	29th of 50	34 °C

Planning a trip? See the best time to visit Barreiras.

QuestionsCommon questions about Barreiras’s climate

When is the best time to visit Barreiras?

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

How hot does Barreiras get?

In October, the warmest month, daily highs average 34 °C. About 237 days a year pass 30 °C. The highest value in the 1991–2020 record is 40 °C.

How cold does it get in winter?

Nights average 19 °C in July, the coldest month. Freezing nights are not part of a normal year here.

Which month is wettest in Barreiras?

November, averaging 155 mm over 14 days with rain. The driest month is July with 0 mm. The year as a whole averages 846 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 Barreiras 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
Data point: -12.153°, -44.990° (the coordinates the reanalysis values are taken for)
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.