nomadseason

Monthly climate in Rio Negro, Brazil

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Rio Negro features a oceanic climate (Cfb). Temperatures typically range between 14 °C (57 °F) and 22 °C (72 °F) through the year, but rarely can drop to -4 °C (26 °F) or can rise to as high as 34 °C (94 °F). The average annual precipitation amounts to about 1196 mm (47.1 inches) and receives 134 rainy days on the 1 mm (0.04 inches) threshold annually. Rio Negro enjoys an average of 2940 hours of sunshine throughout the year, and daylight varies from 10 hours 30 minutes to 13 hours 43 minutes per day.

Monthly average temperatures in Rio Negro, Brazil

The warmest months in Rio Negro are January, February and December, with daily mean temperatures ranging from 21 to 22 °C (70 - 72 °F) throughout the day. The coldest temperatures usually occur in June, July and August, when daily mean temperatures range from 14 to 15 °C (57 - 59 °F) throughout the day. On average each year, Rio Negro experiences 139 days above 25 °C (77.0 °F) and 1 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Rio Negro. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum34°C
(93°F)		34°C
(94°F)		32°C
(89°F)		30°C
(86°F)		28°C
(83°F)		26°C
(79°F)		26°C
(79°F)		30°C
(87°F)		32°C
(90°F)		34°C
(93°F)		31°C
(89°F)		34°C
(93°F)
Mean maximum31°C
(88°F)		31°C
(89°F)		30°C
(87°F)		28°C
(83°F)		27°C
(80°F)		23°C
(75°F)		25°C
(78°F)		28°C
(84°F)		31°C
(88°F)		31°C
(87°F)		31°C
(88°F)		31°C
(89°F)
Average high27°C
(80°F)		27°C
(80°F)		26°C
(79°F)		24°C
(75°F)		21°C
(70°F)		20°C
(68°F)		20°C
(68°F)		20°C
(69°F)		24°C
(75°F)		23°C
(74°F)		25°C
(77°F)		27°C
(80°F)
Daily mean22°C
(72°F)		21°C
(71°F)		21°C
(70°F)		18°C
(65°F)		16°C
(61°F)		15°C
(59°F)		14°C
(57°F)		15°C
(59°F)		18°C
(65°F)		18°C
(65°F)		19°C
(67°F)		21°C
(70°F)
Average low18°C
(66°F)		18°C
(64°F)		18°C
(64°F)		15°C
(59°F)		12°C
(54°F)		11°C
(52°F)		9°C
(48°F)		10°C
(51°F)		14°C
(57°F)		14°C
(58°F)		15°C
(60°F)		17°C
(63°F)
Mean minimum15°C
(59°F)		14°C
(57°F)		14°C
(57°F)		8°C
(47°F)		4°C
(40°F)		4°C
(40°F)		-1°C
(31°F)		1°C
(35°F)		8°C
(47°F)		10°C
(50°F)		10°C
(50°F)		13°C
(56°F)
Minimum13°C
(57°F)		11°C
(51°F)		12°C
(53°F)		4°C
(39°F)		2°C
(35°F)		1°C
(33°F)		-4°C
(26°F)		-1°C
(30°F)		5°C
(42°F)		6°C
(44°F)		8°C
(46°F)		11°C
(52°F)

Compare climate in Rio Negro with other places

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

Monthly average precipitation in Rio Negro, Brazil

Rio Negro usually has the most precipitation in January, October and December, with an average of 16 rainy days and 145 mm (5.7 inches) of precipitation per month. The driest months in Rio Negro are April, July and September. On average, 48 mm (1.9 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Rio Negro. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)150 (5.9)124 (4.9)109 (4.3)47 (1.9)87 (3.4)118 (4.6)27 (1.0)79 (3.1)69 (2.7)147 (5.8)103 (4.1)137 (5.4)
Average precipitation days (≥ 1 mm)1815155810478141317

Monthly sunshine hours in Rio Negro, Brazil

The sunniest months in Rio Negro are March, November and December, when the sun shines an average of 9 hours 2 minutes a day. Least sunny months in Rio Negro: January, June and October receive an average of 6 hours 52 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Rio Negro. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours214265272246225205261238240212267291
Mean daily daylight hours13h 32m12h 57m12h 11m11h 26m10h 48m10h 30m10h 40m11h 13m11h 56m12h 42m13h 23m13h 43m

Solar UV radiation in Rio Negro, Brazil

Rio Negro experiences the highest level of ultraviolet (UV) radiation in January, November and December, when the maximum UV index can reach values of 15 - 15, which corresponds to the Extreme category of sun exposure. May, June and July are in the High / Very High exposure category. In these months, the maximum values of the UV index do not exceed 8. For more detailed information, check out our hourly Rio Negro UV Index data.

Average daily maximum UV levels by month for Rio Negro. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)15151311866911131515