Sinop climate

Name: Sinop
Address: BR

Sinop is warmest in September, with average highs of 34 °C, and coldest in July, when nights average 19 °C. January is the wettest month (293 mm) and July the driest (1.5 mm). Figures are 1991–2020 climate normals.

Across a full year Sinop averages 1,695 mm of rain and 358 days above 25 °C.

Brazil · population 223,780 · 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 September 34 °C
Coldest month July 19 °C
Driest month July 1 mm
Wettest month January 293 mm
Least cloud July 25 % cloud
Hottest on record September 38 °C
Coldest on record June 10 °C

What to expectSinop through the year

Sinop changes little through the year. Average daily highs stay between 32 and 34 °C, so no month stands out as a season in the way it would further from the equator.

Counted across a normal year, 358 days a year reach 25 °C, 202 of them reach 30 °C. The warmest reading in the 1991–2020 record is 38 °C, in September.

Rain is strongly seasonal. January averages 293 mm against 1 mm in July — 201 times as much. Planning around the dry months matters more here than planning around temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	28.4 °C	293 mm	88 %
February	28.6 °C	275 mm	87 %
March	28.7 °C	249 mm	86 %
April	29.2 °C	124 mm	73 %
May	30.2 °C	32 mm	57 %
June	31.1 °C	5 mm	35 %
July	31.7 °C	1 mm	25 %
August	33.4 °C	7 mm	30 %
September	33.5 °C	53 mm	48 %
October	31.4 °C	143 mm	72 %
November	29.4 °C	226 mm	84 %
December	28.6 °C	288 mm	87 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C
January	28.4 °C	21.7 °C	24.3 °C	32.8 °C	19.6 °C	29	7
February	28.6 °C	21.6 °C	24.4 °C	33.0 °C	19.1 °C	27	7
March	28.7 °C	21.6 °C	24.5 °C	32.3 °C	19.5 °C	30	8
April	29.2 °C	21.4 °C	24.7 °C	34.5 °C	16.2 °C	30	9
May	30.2 °C	20.7 °C	25.0 °C	35.1 °C	14.6 °C	31	17
June	31.1 °C	19.7 °C	24.9 °C	33.9 °C	10.2 °C	30	26
July	31.7 °C	19.3 °C	25.0 °C	35.1 °C	12.5 °C	31	28
August	33.4 °C	20.5 °C	26.5 °C	37.3 °C	13.2 °C	31	30
September	33.5 °C	22.0 °C	27.1 °C	38.3 °C	15.9 °C	30	27
October	31.4 °C	22.2 °C	26.0 °C	38.1 °C	18.7 °C	31	22
November	29.4 °C	21.9 °C	24.9 °C	35.5 °C	17.6 °C	29	12
December	28.6 °C	21.8 °C	24.5 °C	33.8 °C	18.8 °C	29	9

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	293 mm	28	13 h/day	88 %	90 %	8.5 km/h
February	275 mm	26	12 h/day	87 %	89 %	8.2 km/h
March	249 mm	26	12 h/day	86 %	89 %	7.8 km/h
April	124 mm	19	12 h/day	73 %	86 %	8.4 km/h
May	32 mm	6	12 h/day	57 %	75 %	9.9 km/h
June	5 mm	1	11 h/day	35 %	61 %	11 km/h
July	1 mm	0	11 h/day	25 %	53 %	12 km/h
August	7 mm	1	12 h/day	30 %	49 %	12 km/h
September	53 mm	8	12 h/day	48 %	61 %	10 km/h
October	143 mm	20	12 h/day	72 %	79 %	8.9 km/h
November	226 mm	25	13 h/day	84 %	87 %	8.3 km/h
December	288 mm	27	13 h/day	87 %	89 %	8.3 km/h

Where Sinop ranks

Ranking	Position	Value
The warmest places in South America in August	25thof 50	33 °C
The warmest places in South America in June	30thof 50	31 °C
The warmest places in South America in July	31stof 50	32 °C
The warmest places in South America in September	31stof 50	34 °C
The driest places in South America in July	37thof 50	1.5 mm
The driest places in South America in June	41stof 50	4.7 mm

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

QuestionsCommon questions about Sinop’s climate

When is the best time to visit Sinop?

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

How hot does Sinop get?

In September, the warmest month, daily highs average 34 °C. About 202 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 19 °C in July, the coldest month. Freezing nights are not part of a normal year here.

Which month is wettest in Sinop?

January, averaging 293 mm over 28 days with rain. The driest month is July with 1 mm. The year as a whole averages 1,695 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 Sinop 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.