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Monthly climate in Grajau, Brazil

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Grajau features a tropical savanna climate (Aw). Temperatures typically range between 26 °C (79 °F) and 29 °C (84 °F) through the year, but rarely can drop to 17 °C (62 °F) or can rise to as high as 39 °C (102 °F). The average annual precipitation amounts to about 986 mm (38.8 inches) and receives 139 rainy days on the 1 mm (0.04 inches) threshold annually. Grajau enjoys an average of 3540 hours of sunshine throughout the year, and daylight varies from 11 hours 46 minutes to 12 hours 26 minutes per day.

Monthly average temperatures in Grajau, Brazil

The warmest months in Grajau are August, September and October, with daily mean temperatures ranging from 28 to 29 °C (83 - 84 °F) throughout the day. The coldest temperatures usually occur in January, February and March, when daily mean temperatures range from 26 to 26 °C (79 - 80 °F) throughout the day. On average each year, Grajau 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 Grajau. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum34°C
(94°F)		34°C
(94°F)		33°C
(92°F)		34°C
(93°F)		35°C
(94°F)		35°C
(95°F)		36°C
(97°F)		37°C
(99°F)		39°C
(102°F)		39°C
(102°F)		36°C
(98°F)		37°C
(99°F)
Mean maximum34°C
(93°F)		33°C
(92°F)		33°C
(92°F)		33°C
(92°F)		34°C
(93°F)		34°C
(93°F)		35°C
(96°F)		37°C
(98°F)		37°C
(99°F)		37°C
(99°F)		36°C
(96°F)		36°C
(96°F)
Average high31°C
(88°F)		31°C
(88°F)		31°C
(87°F)		31°C
(88°F)		32°C
(90°F)		33°C
(92°F)		34°C
(93°F)		35°C
(95°F)		35°C
(96°F)		34°C
(94°F)		33°C
(91°F)		32°C
(90°F)
Daily mean26°C
(80°F)		26°C
(80°F)		26°C
(79°F)		27°C
(80°F)		27°C
(81°F)		27°C
(81°F)		27°C
(81°F)		28°C
(83°F)		29°C
(84°F)		29°C
(84°F)		28°C
(82°F)		27°C
(82°F)
Average low23°C
(74°F)		23°C
(74°F)		23°C
(74°F)		23°C
(74°F)		23°C
(73°F)		22°C
(71°F)		21°C
(70°F)		21°C
(71°F)		23°C
(74°F)		24°C
(75°F)		24°C
(75°F)		24°C
(75°F)
Mean minimum21°C
(71°F)		22°C
(71°F)		22°C
(72°F)		22°C
(71°F)		21°C
(69°F)		20°C
(68°F)		19°C
(66°F)		19°C
(67°F)		21°C
(70°F)		22°C
(73°F)		22°C
(73°F)		22°C
(72°F)
Minimum21°C
(70°F)		20°C
(69°F)		21°C
(71°F)		21°C
(70°F)		20°C
(68°F)		18°C
(64°F)		17°C
(62°F)		17°C
(63°F)		20°C
(68°F)		22°C
(71°F)		22°C
(71°F)		21°C
(71°F)

Compare climate in Grajau with other places

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

Monthly average precipitation in Grajau, Brazil

Grajau usually has the most precipitation in February, March and April, with an average of 24 rainy days and 184 mm (7.3 inches) of precipitation per month. The driest months in Grajau are June, July and August. On average, 3 mm (0.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Grajau. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)122 (4.8)214 (8.4)193 (7.6)146 (5.8)45 (1.8)4 (0.2)3 (0.1)2 (0.1)9 (0.4)36 (1.4)88 (3.4)124 (4.9)
Average precipitation days (≥ 1 mm)202427228100161317

Monthly sunshine hours in Grajau, Brazil

The sunniest months in Grajau are July, August and September, when the sun shines an average of 11 hours 2 minutes a day. Least sunny months in Grajau: January, February and March receive an average of 7 hours 44 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Grajau. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours226218260263320326336343336335288285
Mean daily daylight hours12h 24m12h 16m12h 6m11h 57m11h 50m11h 46m11h 48m11h 54m12h 3m12h 13m12h 22m12h 26m

Solar UV radiation in Grajau, Brazil

Grajau experiences the highest level of ultraviolet (UV) radiation in January, March and April, when the maximum UV index can reach values of 15 - 15, which corresponds to the Extreme category of sun exposure. June, July and August are in the Extreme exposure category. In these months, the maximum values of the UV index do not exceed 12. For more detailed information, check out our hourly Grajau UV Index data.

Average daily maximum UV levels by month for Grajau. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)151515151311111213131414