Castanhal climate

Name: Castanhal
Address: BR

Castanhal is warmest in October, with average highs of 33 °C, and coldest in July, when nights average 23 °C. March is the wettest month (444 mm) and October the driest (34 mm). Figures are 1991–2020 climate normals.

Across a full year Castanhal averages 2,237 mm of rain and 365 days above 25 °C.

Brazil · population 192,256 · 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 33 °C
Coldest month July 23 °C
Driest month October 34 mm
Wettest month March 444 mm
Least cloud August 37 % cloud
Hottest on record November 36 °C
Coldest on record July 20 °C

What to expectCastanhal through the year

Castanhal changes little through the year. Average daily highs stay between 30 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, 365 days a year reach 25 °C, 221 of them reach 30 °C. The warmest reading in the 1991–2020 record is 36 °C, in November.

Rain is strongly seasonal. March averages 444 mm against 34 mm in October — 13 times as much. Planning around the dry months matters more here than planning around temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	29.9 °C	261 mm	81 %
February	29.1 °C	343 mm	86 %
March	29.0 °C	444 mm	88 %
April	29.0 °C	419 mm	88 %
May	29.5 °C	271 mm	75 %
June	29.8 °C	124 mm	53 %
July	30.1 °C	93 mm	44 %
August	31.2 °C	52 mm	37 %
September	32.3 °C	35 mm	38 %
October	33.1 °C	34 mm	46 %
November	33.0 °C	52 mm	58 %
December	31.9 °C	110 mm	67 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C
January	29.9 °C	23.3 °C	25.8 °C	34.2 °C	21.5 °C	31	14
February	29.1 °C	23.0 °C	25.3 °C	33.4 °C	21.0 °C	28	7
March	29.0 °C	23.0 °C	25.1 °C	34.9 °C	21.5 °C	31	6
April	29.0 °C	23.0 °C	25.2 °C	32.2 °C	21.5 °C	30	7
May	29.5 °C	23.0 °C	25.5 °C	32.1 °C	21.1 °C	31	12
June	29.8 °C	22.7 °C	25.6 °C	32.0 °C	20.9 °C	30	12
July	30.1 °C	22.6 °C	25.6 °C	32.7 °C	20.2 °C	31	16
August	31.2 °C	23.0 °C	26.4 °C	35.1 °C	20.8 °C	31	28
September	32.3 °C	23.4 °C	27.1 °C	35.6 °C	21.0 °C	30	30
October	33.1 °C	23.7 °C	27.7 °C	36.1 °C	21.5 °C	31	31
November	33.0 °C	24.0 °C	27.8 °C	36.4 °C	21.6 °C	30	30
December	31.9 °C	24.0 °C	27.2 °C	36.3 °C	21.5 °C	31	27

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	261 mm	27	12 h/day	81 %	84 %	12 km/h
February	343 mm	27	12 h/day	86 %	87 %	12 km/h
March	444 mm	30	12 h/day	88 %	89 %	12 km/h
April	419 mm	29	12 h/day	88 %	89 %	11 km/h
May	271 mm	28	12 h/day	75 %	88 %	11 km/h
June	124 mm	21	12 h/day	53 %	85 %	12 km/h
July	93 mm	18	12 h/day	44 %	83 %	12 km/h
August	52 mm	13	12 h/day	37 %	79 %	13 km/h
September	35 mm	8	12 h/day	38 %	74 %	15 km/h
October	34 mm	8	12 h/day	46 %	71 %	15 km/h
November	52 mm	9	12 h/day	58 %	71 %	15 km/h
December	110 mm	17	12 h/day	67 %	76 %	14 km/h

How Castanhal compares

The same four figures for nearby destinations, so the numbers above have something to be read against. Summer high is the warmest month's average high; winter low is the coldest month's average low.

Destination	Summer high	Winter low	Rain per year	Days above 25 °C
Castanhal	33 °C	23 °C	2,237 mm	365
Ananindeua · Brazil	33 °C	24 °C	2,521 mm	364
Belém · Brazil	32 °C	24 °C	2,052 mm	365
Abaetetuba · Brazil	33 °C	24 °C	1,980 mm	364

Where Castanhal ranks

Ranking	Position	Value
The warmest places in South America in November	8th of 50	33 °C
The warmest places in South America in December	12th of 50	32 °C
The warmest places in South America in October	25th of 50	33 °C
The warmest places in South America in September	40th of 50	32 °C
The warmest places in South America in August	43rd of 50	31 °C
The warmest places in South America year-round	45th of 50	31 °C

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

QuestionsCommon questions about Castanhal’s climate

When is the best time to visit Castanhal?

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

How hot does Castanhal get?

In October, the warmest month, daily highs average 33 °C. About 221 days a year pass 30 °C. The highest value in the 1991–2020 record is 36 °C.

How cold does it get in winter?

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

Which month is wettest in Castanhal?

March, averaging 444 mm over 30 days with rain. The driest month is October with 34 mm. The year as a whole averages 2,237 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 Castanhal 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: -1.294°, -47.926° (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.