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Monthly climate in Niteroi, Brazil

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Niteroi features a tropical savanna climate (Aw). Temperatures typically range between 21 °C (71 °F) and 27 °C (81 °F) through the year, but rarely can drop to 14 °C (58 °F) or can rise to as high as 36 °C (97 °F). The average annual precipitation amounts to about 1014 mm (39.9 inches) and receives 145 rainy days on the 1 mm (0.04 inches) threshold annually. Niteroi enjoys an average of 3445 hours of sunshine throughout the year, and daylight varies from 10 hours 44 minutes to 13 hours 30 minutes per day.

Monthly average temperatures in Niteroi, Brazil

The warmest months in Niteroi are January, February and March, with daily mean temperatures ranging from 27 to 27 °C (80 - 81 °F) throughout the day. The coldest temperatures usually occur in June, July and August, when daily mean temperatures range from 21 to 22 °C (71 - 73 °F) throughout the day. On average each year, Niteroi experiences 241 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 Niteroi. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum34°C
(94°F)		35°C
(95°F)		34°C
(94°F)		34°C
(93°F)		33°C
(91°F)		31°C
(89°F)		32°C
(90°F)		32°C
(90°F)		34°C
(94°F)		36°C
(97°F)		34°C
(94°F)		33°C
(92°F)
Mean maximum34°C
(94°F)		33°C
(92°F)		33°C
(92°F)		32°C
(90°F)		31°C
(88°F)		29°C
(85°F)		30°C
(86°F)		31°C
(88°F)		33°C
(91°F)		33°C
(92°F)		32°C
(91°F)		33°C
(91°F)
Average high30°C
(87°F)		29°C
(85°F)		30°C
(85°F)		27°C
(82°F)		26°C
(79°F)		26°C
(78°F)		25°C
(77°F)		24°C
(76°F)		26°C
(80°F)		26°C
(80°F)		26°C
(80°F)		28°C
(83°F)
Daily mean27°C
(81°F)		27°C
(80°F)		27°C
(80°F)		25°C
(77°F)		23°C
(74°F)		22°C
(73°F)		21°C
(71°F)		21°C
(71°F)		23°C
(74°F)		24°C
(75°F)		24°C
(75°F)		25°C
(78°F)
Average low25°C
(77°F)		24°C
(76°F)		24°C
(76°F)		22°C
(73°F)		21°C
(69°F)		20°C
(69°F)		19°C
(66°F)		19°C
(66°F)		20°C
(69°F)		22°C
(71°F)		22°C
(71°F)		23°C
(74°F)
Mean minimum23°C
(73°F)		22°C
(72°F)		22°C
(72°F)		20°C
(69°F)		18°C
(64°F)		19°C
(66°F)		16°C
(62°F)		16°C
(61°F)		18°C
(64°F)		18°C
(66°F)		19°C
(66°F)		20°C
(69°F)
Minimum21°C
(70°F)		21°C
(71°F)		20°C
(69°F)		19°C
(67°F)		16°C
(61°F)		16°C
(62°F)		15°C
(59°F)		14°C
(58°F)		17°C
(63°F)		17°C
(63°F)		18°C
(64°F)		19°C
(67°F)

Compare climate in Niteroi with other places

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

Monthly average precipitation in Niteroi, Brazil

Niteroi usually has the most precipitation in February, March and December, with an average of 15 rainy days and 126 mm (5.0 inches) of precipitation per month. The driest months in Niteroi are June, July and September. On average, 41 mm (1.6 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Niteroi. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)91 (3.6)119 (4.7)138 (5.4)81 (3.2)73 (2.9)39 (1.5)35 (1.4)68 (2.7)48 (1.9)86 (3.4)115 (4.5)121 (4.8)
Average precipitation days (≥ 1 mm)111516141096118141615

Monthly sunshine hours in Niteroi, Brazil

The sunniest months in Niteroi are March, April and December, when the sun shines an average of 10 hours 2 minutes a day. Least sunny months in Niteroi: January, February and August receive an average of 8 hours 58 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Niteroi. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours270271309295282275289274293280284318
Mean daily daylight hours13h 20m12h 50m12h 11m11h 31m10h 59m10h 44m10h 52m11h 20m11h 57m12h 37m13h 12m13h 30m

Solar UV radiation in Niteroi, Brazil

Niteroi experiences the highest level of ultraviolet (UV) radiation in January, February and December, when the maximum UV index can reach values of 14 - 15, which corresponds to the Extreme category of sun exposure. May, June and July are in the High exposure category. In these months, the maximum values of the UV index do not exceed 7. For more detailed information, check out our hourly Niteroi UV Index data.

Average daily maximum UV levels by month for Niteroi. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)15141310767911121315