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Monthly climate in Bastos, Brazil

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Bastos features a tropical savanna climate (Aw). Temperatures typically range between 21 °C (70 °F) and 26 °C (79 °F) through the year, but rarely can drop to 3 °C (37 °F) or can rise to as high as 42 °C (107 °F). The average annual precipitation amounts to about 918 mm (36.1 inches) and receives 110 rainy days on the 1 mm (0.04 inches) threshold annually. Bastos enjoys an average of 3609 hours of sunshine throughout the year, and daylight varies from 10 hours 48 minutes to 13 hours 26 minutes per day.

Monthly average temperatures in Bastos, Brazil

The warmest months in Bastos are January, September and December, with daily mean temperatures ranging from 26 to 26 °C (79 - 79 °F) throughout the day. The coldest temperatures usually occur in May, June and July, when daily mean temperatures range from 21 to 22 °C (70 - 71 °F) throughout the day. On average each year, Bastos experiences 301 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 Bastos. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum37°C
(100°F)		37°C
(100°F)		36°C
(97°F)		35°C
(95°F)		33°C
(92°F)		33°C
(91°F)		33°C
(93°F)		37°C
(98°F)		41°C
(106°F)		42°C
(107°F)		38°C
(101°F)		37°C
(99°F)
Mean maximum35°C
(96°F)		35°C
(95°F)		35°C
(95°F)		33°C
(92°F)		32°C
(90°F)		31°C
(87°F)		32°C
(90°F)		35°C
(96°F)		38°C
(101°F)		37°C
(100°F)		36°C
(98°F)		35°C
(96°F)
Average high31°C
(88°F)		31°C
(88°F)		31°C
(89°F)		30°C
(86°F)		28°C
(82°F)		27°C
(81°F)		28°C
(83°F)		28°C
(83°F)		33°C
(92°F)		32°C
(89°F)		32°C
(89°F)		31°C
(89°F)
Daily mean26°C
(79°F)		26°C
(79°F)		26°C
(79°F)		24°C
(76°F)		22°C
(71°F)		21°C
(70°F)		21°C
(70°F)		22°C
(71°F)		26°C
(79°F)		26°C
(78°F)		26°C
(79°F)		26°C
(79°F)
Average low22°C
(72°F)		21°C
(71°F)		21°C
(71°F)		19°C
(66°F)		16°C
(62°F)		16°C
(61°F)		14°C
(58°F)		16°C
(60°F)		19°C
(67°F)		20°C
(69°F)		20°C
(69°F)		21°C
(71°F)
Mean minimum19°C
(67°F)		19°C
(66°F)		18°C
(65°F)		14°C
(57°F)		10°C
(50°F)		11°C
(51°F)		6°C
(43°F)		9°C
(48°F)		14°C
(58°F)		15°C
(60°F)		16°C
(61°F)		18°C
(65°F)
Minimum18°C
(65°F)		17°C
(63°F)		17°C
(63°F)		10°C
(50°F)		7°C
(44°F)		6°C
(43°F)		3°C
(37°F)		7°C
(44°F)		12°C
(54°F)		14°C
(57°F)		13°C
(56°F)		16°C
(61°F)

Compare climate in Bastos with other places

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

Monthly average precipitation in Bastos, Brazil

Bastos usually has the most precipitation in January, February and December, with an average of 16 rainy days and 145 mm (5.7 inches) of precipitation per month. The driest months in Bastos are June, July and September. On average, 20 mm (0.8 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Bastos. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)149 (5.9)144 (5.7)86 (3.4)45 (1.8)41 (1.6)25 (1.0)6 (0.2)45 (1.8)30 (1.2)105 (4.1)102 (4.0)141 (5.5)
Average precipitation days (≥ 1 mm)171513545154111317

Monthly sunshine hours in Bastos, Brazil

The sunniest months in Bastos are March, November and December, when the sun shines an average of 10 hours 36 minutes a day. Least sunny months in Bastos: January, February and June receive an average of 9 hours 3 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Bastos. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours249286330300291279309295312308319325
Mean daily daylight hours13h 17m12h 47m12h 10m11h 33m11h 2m10h 48m10h 55m11h 22m11h 58m12h 36m13h 9m13h 26m

Solar UV radiation in Bastos, Brazil

Bastos 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 Bastos UV Index data.

Average daily maximum UV levels by month for Bastos. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)151513118771011141416