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Monthly climate in Rio das Ostras, Brazil

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Rio das Ostras features a tropical savanna climate (Aw). Temperatures typically range between 21 °C (70 °F) and 27 °C (81 °F) through the year, but rarely can drop to 12 °C (53 °F) or can rise to as high as 36 °C (98 °F). The average annual precipitation amounts to about 1400 mm (55.1 inches) and receives 153 rainy days on the 1 mm (0.04 inches) threshold annually. Rio das Ostras enjoys an average of 3578 hours of sunshine throughout the year, and daylight varies from 10 hours 45 minutes to 13 hours 28 minutes per day.

Monthly average temperatures in Rio das Ostras, Brazil

The warmest months in Rio das Ostras are January, February and March, with daily mean temperatures ranging from 26 to 27 °C (79 - 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 (70 - 72 °F) throughout the day. On average each year, Rio das Ostras experiences 263 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 Rio das Ostras. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum36°C
(97°F)		36°C
(97°F)		35°C
(96°F)		35°C
(96°F)		34°C
(93°F)		33°C
(91°F)		33°C
(91°F)		34°C
(93°F)		35°C
(96°F)		36°C
(98°F)		36°C
(98°F)		34°C
(93°F)
Mean maximum35°C
(96°F)		34°C
(94°F)		35°C
(95°F)		34°C
(93°F)		32°C
(91°F)		30°C
(87°F)		31°C
(88°F)		32°C
(90°F)		34°C
(93°F)		34°C
(93°F)		34°C
(93°F)		34°C
(93°F)
Average high31°C
(88°F)		30°C
(86°F)		30°C
(87°F)		28°C
(83°F)		27°C
(80°F)		26°C
(80°F)		26°C
(79°F)		25°C
(78°F)		27°C
(81°F)		27°C
(81°F)		27°C
(81°F)		29°C
(84°F)
Daily mean27°C
(81°F)		26°C
(79°F)		26°C
(79°F)		24°C
(76°F)		22°C
(73°F)		22°C
(72°F)		21°C
(70°F)		21°C
(70°F)		23°C
(74°F)		24°C
(75°F)		24°C
(75°F)		25°C
(78°F)
Average low24°C
(75°F)		23°C
(74°F)		23°C
(73°F)		21°C
(70°F)		19°C
(66°F)		18°C
(65°F)		17°C
(63°F)		18°C
(64°F)		20°C
(68°F)		21°C
(70°F)		21°C
(70°F)		22°C
(72°F)
Mean minimum21°C
(71°F)		21°C
(70°F)		20°C
(69°F)		18°C
(65°F)		15°C
(59°F)		15°C
(60°F)		13°C
(56°F)		14°C
(57°F)		16°C
(62°F)		17°C
(63°F)		17°C
(63°F)		18°C
(65°F)
Minimum20°C
(68°F)		20°C
(68°F)		19°C
(66°F)		16°C
(62°F)		13°C
(56°F)		13°C
(56°F)		12°C
(53°F)		13°C
(55°F)		15°C
(59°F)		16°C
(61°F)		15°C
(60°F)		16°C
(61°F)

Compare climate in Rio das Ostras with other places

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

Monthly average precipitation in Rio das Ostras, Brazil

Rio das Ostras usually has the most precipitation in February, November and December, with an average of 19 rainy days and 219 mm (8.6 inches) of precipitation per month. The driest months in Rio das Ostras are June, July and August. On average, 35 mm (1.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Rio das Ostras. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)127 (5.0)190 (7.5)185 (7.3)73 (2.9)68 (2.7)34 (1.3)19 (0.7)53 (2.1)66 (2.6)117 (4.6)235 (9.3)233 (9.2)
Average precipitation days (≥ 1 mm)12201712975108151820

Monthly sunshine hours in Rio das Ostras, Brazil

The sunniest months in Rio das Ostras are March, September and December, when the sun shines an average of 10 hours 25 minutes a day. Least sunny months in Rio das Ostras: January, February and June receive an average of 9 hours 27 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Rio das Ostras. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours285279322302289285297291306291297330
Mean daily daylight hours13h 19m12h 49m12h 10m11h 32m11h 0m10h 45m10h 53m11h 21m11h 58m12h 36m13h 11m13h 28m

Solar UV radiation in Rio das Ostras, Brazil

Rio das Ostras experiences the highest level of ultraviolet (UV) radiation in January, February and December, when the maximum UV index can reach values of 15 - 16, 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 das Ostras UV Index data.

Average daily maximum UV levels by month for Rio das Ostras. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)16151311867912131416