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Monthly climate in Castanhal, Brazil

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Castanhal features a tropical monsoon climate (Am). Temperatures typically range between 26 °C (79 °F) and 28 °C (83 °F) through the year, but rarely can drop to 20 °C (69 °F) or can rise to as high as 36 °C (98 °F). The average annual precipitation amounts to about 2804 mm (110.4 inches) and receives 251 rainy days on the 1 mm (0.04 inches) threshold annually. Castanhal enjoys an average of 3588 hours of sunshine throughout the year, and daylight varies from 12 hours 2 minutes to 12 hours 11 minutes per day.

Monthly average temperatures in Castanhal, Brazil

The warmest months in Castanhal are September, October and November, with daily mean temperatures ranging from 28 to 28 °C (82 - 83 °F) throughout the day. The coldest temperatures usually occur in February, March and April, when daily mean temperatures range from 26 to 26 °C (79 - 79 °F) throughout the day. On average each year, Castanhal experiences 329 days above 25 °C (77.0 °F) and 0 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Castanhal. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum34°C
(93°F)		33°C
(92°F)		34°C
(93°F)		34°C
(94°F)		34°C
(93°F)		34°C
(93°F)		34°C
(93°F)		35°C
(96°F)		36°C
(96°F)		35°C
(96°F)		36°C
(97°F)		36°C
(98°F)
Mean maximum33°C
(92°F)		33°C
(92°F)		33°C
(91°F)		33°C
(91°F)		33°C
(92°F)		33°C
(92°F)		33°C
(92°F)		34°C
(94°F)		35°C
(95°F)		35°C
(95°F)		35°C
(95°F)		34°C
(94°F)
Average high31°C
(87°F)		30°C
(86°F)		30°C
(86°F)		30°C
(87°F)		31°C
(88°F)		32°C
(90°F)		32°C
(90°F)		33°C
(91°F)		33°C
(92°F)		34°C
(93°F)		33°C
(92°F)		32°C
(90°F)
Daily mean26°C
(79°F)		26°C
(79°F)		26°C
(79°F)		26°C
(79°F)		26°C
(80°F)		27°C
(80°F)		27°C
(80°F)		27°C
(81°F)		28°C
(82°F)		28°C
(83°F)		28°C
(82°F)		27°C
(81°F)
Average low23°C
(74°F)		23°C
(74°F)		23°C
(74°F)		23°C
(74°F)		23°C
(74°F)		23°C
(74°F)		23°C
(73°F)		23°C
(73°F)		23°C
(74°F)		23°C
(74°F)		24°C
(75°F)		24°C
(75°F)
Mean minimum22°C
(72°F)		22°C
(72°F)		22°C
(72°F)		22°C
(72°F)		22°C
(72°F)		22°C
(72°F)		21°C
(70°F)		21°C
(71°F)		22°C
(72°F)		22°C
(72°F)		22°C
(72°F)		22°C
(73°F)
Minimum21°C
(71°F)		21°C
(71°F)		22°C
(71°F)		22°C
(72°F)		21°C
(71°F)		21°C
(71°F)		20°C
(69°F)		21°C
(70°F)		21°C
(71°F)		22°C
(71°F)		22°C
(72°F)		22°C
(71°F)

Compare climate in Castanhal with other places

Compare temperature, precipitation, sunshine, UV index in Castanhal, Brazil with other places around the world.

Monthly average precipitation in Castanhal, Brazil

Castanhal usually has the most precipitation in February, March and April, with an average of 28 rainy days and 502 mm (19.7 inches) of precipitation per month. The driest months in Castanhal are August, September and October. On average, 55 mm (2.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Castanhal. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)265 (10.4)525 (20.7)535 (21.1)445 (17.5)350 (13.8)132 (5.2)86 (3.4)56 (2.2)53 (2.1)58 (2.3)98 (3.9)202 (8.0)
Average precipitation days (≥ 1 mm)242730292721161313131523

Monthly sunshine hours in Castanhal, Brazil

The sunniest months in Castanhal are July, August and October, when the sun shines an average of 11 hours 10 minutes a day. Least sunny months in Castanhal: January, February and April receive an average of 7 hours 59 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Castanhal. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours238232256247287315343346335348325310
Mean daily daylight hours12h 10m12h 8m12h 5m12h 3m12h 2m12h 2m12h 2m12h 3m12h 5m12h 7m12h 9m12h 11m

Solar UV radiation in Castanhal, Brazil

Castanhal experiences the highest level of ultraviolet (UV) radiation in February, March and April, when the maximum UV index can reach values of 15 - 16, which corresponds to the Extreme category of sun exposure. June, July and October are in the Extreme exposure category. In these months, the maximum values of the UV index do not exceed 13. For more detailed information, check out our hourly Castanhal UV Index data.

Average daily maximum UV levels by month for Castanhal. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)141516161412111313131313