Mossoró climate

Name: Mossoró
Address: BR

Mossoró is warmest in October, with average highs of 35 °C, and coldest in August, when nights average 23 °C. March is the wettest month (133 mm) and September the driest (1.1 mm). Figures are 1991–2020 climate normals.

Across a full year Mossoró averages 552 mm of rain and 365 days above 25 °C.

Brazil · population 264,577 · 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 35 °C
Coldest month August 23 °C
Driest month September 1 mm
Wettest month March 133 mm
Least cloud September 24 % cloud
Hottest on record October 39 °C
Coldest on record August 20 °C

What to expectMossoró through the year

Mossoró changes little through the year. Average daily highs stay between 34 and 35 °C, so no month stands out as a season in the way it would further from the equator.

Counted across a normal year, 365 days a year reach 25 °C, 336 of them reach 30 °C. The warmest reading in the 1991–2020 record is 39 °C, in October.

Rain is strongly seasonal. March averages 133 mm against 1 mm in September — 124 times as much. Planning around the dry months matters more here than planning around temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	33.3 °C	70 mm	59 %
February	32.6 °C	86 mm	63 %
March	31.9 °C	133 mm	65 %
April	31.6 °C	126 mm	65 %
May	32.3 °C	59 mm	52 %
June	32.2 °C	30 mm	45 %
July	32.6 °C	20 mm	39 %
August	34.1 °C	3 mm	29 %
September	35.0 °C	1 mm	24 %
October	35.2 °C	2 mm	30 %
November	35.0 °C	4 mm	39 %
December	34.4 °C	17 mm	47 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C
January	33.3 °C	24.4 °C	28.0 °C	37.7 °C	22.2 °C	31	29
February	32.6 °C	24.2 °C	27.7 °C	38.2 °C	21.9 °C	28	25
March	31.9 °C	24.1 °C	27.3 °C	38.5 °C	21.7 °C	31	26
April	31.6 °C	24.0 °C	27.1 °C	37.8 °C	21.6 °C	30	24
May	32.3 °C	23.9 °C	27.5 °C	37.8 °C	21.2 °C	31	27
June	32.2 °C	23.3 °C	27.2 °C	36.9 °C	20.4 °C	30	26
July	32.6 °C	22.8 °C	27.2 °C	36.4 °C	19.9 °C	31	28
August	34.1 °C	22.7 °C	27.8 °C	36.8 °C	19.8 °C	31	31
September	35.0 °C	23.2 °C	28.3 °C	37.4 °C	21.2 °C	30	30
October	35.2 °C	23.6 °C	28.5 °C	38.8 °C	21.7 °C	31	31
November	35.0 °C	24.0 °C	28.5 °C	38.4 °C	21.7 °C	30	30
December	34.4 °C	24.4 °C	28.5 °C	38.4 °C	22.4 °C	31	31

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	70 mm	12	12 h/day	59 %	70 %	21 km/h
February	86 mm	13	12 h/day	63 %	73 %	20 km/h
March	133 mm	18	12 h/day	65 %	77 %	18 km/h
April	126 mm	17	12 h/day	65 %	78 %	17 km/h
May	59 mm	9	12 h/day	52 %	72 %	18 km/h
June	30 mm	6	12 h/day	45 %	67 %	20 km/h
July	20 mm	3	12 h/day	39 %	61 %	22 km/h
August	3 mm	1	12 h/day	29 %	55 %	23 km/h
September	1 mm	0	12 h/day	24 %	55 %	25 km/h
October	2 mm	0	12 h/day	30 %	58 %	25 km/h
November	4 mm	1	12 h/day	39 %	61 %	24 km/h
December	17 mm	4	12 h/day	47 %	64 %	23 km/h

Where Mossoró ranks

Ranking	Position	Value
The warmest places in South America in December	2ndof 50	34 °C
The warmest places in South America in January	3rdof 50	33 °C
The warmest places in South America in November	3rdof 50	35 °C
The warmest places in South America year-round	5thof 50	33 °C
The warmest places in South America in October	7thof 50	35 °C
The warmest places in South America in February	9thof 50	33 °C

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

QuestionsCommon questions about Mossoró’s climate

When is the best time to visit Mossoró?

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

How hot does Mossoró get?

In October, the warmest month, daily highs average 35 °C. About 336 days a year pass 30 °C. The highest value in the 1991–2020 record is 39 °C.

How cold does it get in winter?

Nights average 23 °C in August, the coldest month. Freezing nights are not part of a normal year here.

Which month is wettest in Mossoró?

March, averaging 133 mm over 18 days with rain. The driest month is September with 1 mm. The year as a whole averages 552 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 Mossoró 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.