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Monthly climate in Oeiras, Brazil

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Oeiras features a tropical savanna climate (Aw). Temperatures typically range between 27 °C (81 °F) and 32 °C (90 °F) through the year, but rarely can drop to 20 °C (68 °F) or can rise to as high as 40 °C (104 °F). The average annual precipitation amounts to about 713 mm (28.1 inches) and receives 92 rainy days on the 1 mm (0.04 inches) threshold annually. Oeiras enjoys an average of 3806 hours of sunshine throughout the year, and daylight varies from 11 hours 42 minutes to 12 hours 30 minutes per day.

Monthly average temperatures in Oeiras, Brazil

The warmest months in Oeiras are September, October and November, with daily mean temperatures ranging from 30 to 32 °C (86 - 90 °F) throughout the day. The coldest temperatures usually occur in February, March and April, when daily mean temperatures range from 27 to 27 °C (81 - 82 °F) throughout the day. On average each year, Oeiras 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 Oeiras. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum39°C
(103°F)		37°C
(98°F)		35°C
(94°F)		35°C
(95°F)		37°C
(98°F)		37°C
(98°F)		38°C
(101°F)		38°C
(101°F)		40°C
(104°F)		40°C
(104°F)		39°C
(103°F)		39°C
(102°F)
Mean maximum36°C
(97°F)		35°C
(95°F)		34°C
(93°F)		34°C
(94°F)		35°C
(96°F)		35°C
(95°F)		36°C
(97°F)		38°C
(100°F)		39°C
(102°F)		39°C
(103°F)		37°C
(99°F)		36°C
(98°F)
Average high32°C
(91°F)		32°C
(89°F)		31°C
(88°F)		32°C
(90°F)		33°C
(92°F)		34°C
(93°F)		34°C
(93°F)		36°C
(97°F)		37°C
(99°F)		37°C
(99°F)		35°C
(95°F)		33°C
(93°F)
Daily mean28°C
(82°F)		27°C
(81°F)		27°C
(81°F)		27°C
(82°F)		29°C
(84°F)		29°C
(84°F)		29°C
(84°F)		30°C
(86°F)		31°C
(89°F)		32°C
(90°F)		30°C
(86°F)		29°C
(84°F)
Average low24°C
(76°F)		24°C
(75°F)		24°C
(75°F)		24°C
(75°F)		24°C
(76°F)		24°C
(75°F)		23°C
(74°F)		24°C
(75°F)		25°C
(78°F)		27°C
(81°F)		26°C
(79°F)		25°C
(77°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)		22°C
(71°F)		21°C
(71°F)		23°C
(74°F)		24°C
(75°F)		23°C
(74°F)		23°C
(74°F)
Minimum22°C
(71°F)		22°C
(72°F)		21°C
(70°F)		21°C
(71°F)		21°C
(70°F)		20°C
(69°F)		21°C
(70°F)		20°C
(68°F)		21°C
(71°F)		23°C
(74°F)		22°C
(72°F)		22°C
(72°F)

Compare climate in Oeiras with other places

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

Monthly average precipitation in Oeiras, Brazil

Oeiras usually has the most precipitation in February, March and April, with an average of 19 rainy days and 154 mm (6.1 inches) of precipitation per month. The driest months in Oeiras are July, August and September. On average, 0 mm (0.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Oeiras. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)82 (3.2)217 (8.5)159 (6.3)86 (3.4)13 (0.5)3 (0.1)0 (0.0)0 (0.0)0 (0.0)20 (0.8)51 (2.0)81 (3.2)
Average precipitation days (≥ 1 mm)14212214300002610

Monthly sunshine hours in Oeiras, Brazil

The sunniest months in Oeiras are August, September and October, when the sun shines an average of 11 hours 21 minutes a day. Least sunny months in Oeiras: January, February and March receive an average of 9 hours 0 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Oeiras. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours250265303308326324328348343353326326
Mean daily daylight hours12h 27m12h 18m12h 7m11h 55m11h 46m11h 42m11h 44m11h 52m12h 3m12h 14m12h 25m12h 30m

Solar UV radiation in Oeiras, Brazil

Oeiras experiences the highest level of ultraviolet (UV) radiation in March, April 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 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 Oeiras UV Index data.

Average daily maximum UV levels by month for Oeiras. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)141415141211111213131414