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Monthly climate in Castelo do Piaui, Brazil

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Castelo do Piaui features a tropical savanna climate (Aw). Temperatures typically range between 27 °C (80 °F) and 31 °C (89 °F) through the year, but rarely can drop to 21 °C (69 °F) or can rise to as high as 40 °C (104 °F). The average annual precipitation amounts to about 974 mm (38.3 inches) and receives 99 rainy days on the 1 mm (0.04 inches) threshold annually. Castelo do Piaui enjoys an average of 3789 hours of sunshine throughout the year, and daylight varies from 11 hours 48 minutes to 12 hours 24 minutes per day.

Monthly average temperatures in Castelo do Piaui, Brazil

The warmest months in Castelo do Piaui are September, October and November, with daily mean temperatures ranging from 31 to 31 °C (88 - 89 °F) throughout the day. The coldest temperatures usually occur in February, March and April, when daily mean temperatures range from 27 to 27 °C (80 - 81 °F) throughout the day. On average each year, Castelo do Piaui 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 Castelo do Piaui. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum39°C
(102°F)		38°C
(101°F)		35°C
(96°F)		34°C
(93°F)		37°C
(98°F)		35°C
(96°F)		36°C
(98°F)		37°C
(100°F)		38°C
(101°F)		40°C
(104°F)		39°C
(103°F)		39°C
(103°F)
Mean maximum37°C
(98°F)		36°C
(96°F)		34°C
(93°F)		33°C
(92°F)		34°C
(94°F)		35°C
(95°F)		35°C
(96°F)		37°C
(99°F)		38°C
(100°F)		39°C
(102°F)		39°C
(102°F)		38°C
(100°F)
Average high33°C
(92°F)		32°C
(90°F)		31°C
(88°F)		31°C
(89°F)		32°C
(91°F)		34°C
(93°F)		34°C
(93°F)		35°C
(96°F)		37°C
(98°F)		37°C
(99°F)		36°C
(98°F)		35°C
(96°F)
Daily mean28°C
(83°F)		27°C
(81°F)		27°C
(80°F)		27°C
(80°F)		27°C
(82°F)		28°C
(83°F)		28°C
(83°F)		30°C
(86°F)		31°C
(88°F)		31°C
(89°F)		31°C
(88°F)		30°C
(86°F)
Average low24°C
(76°F)		23°C
(74°F)		23°C
(74°F)		23°C
(74°F)		23°C
(74°F)		23°C
(74°F)		23°C
(74°F)		24°C
(75°F)		25°C
(77°F)		25°C
(78°F)		25°C
(78°F)		25°C
(77°F)
Mean minimum22°C
(72°F)		22°C
(72°F)		22°C
(72°F)		22°C
(72°F)		22°C
(71°F)		22°C
(72°F)		21°C
(71°F)		22°C
(72°F)		23°C
(74°F)		24°C
(75°F)		24°C
(76°F)		24°C
(75°F)
Minimum21°C
(71°F)		22°C
(72°F)		21°C
(71°F)		21°C
(70°F)		21°C
(69°F)		21°C
(70°F)		21°C
(69°F)		21°C
(69°F)		22°C
(72°F)		23°C
(74°F)		23°C
(74°F)		22°C
(72°F)

Compare climate in Castelo do Piaui with other places

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

Monthly average precipitation in Castelo do Piaui, Brazil

Castelo do Piaui usually has the most precipitation in February, March and April, with an average of 21 rainy days and 246 mm (9.7 inches) of precipitation per month. The driest months in Castelo do Piaui are June, August and September. On average, 1 mm (0.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Castelo do Piaui. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)116 (4.6)263 (10.4)298 (11.7)177 (7.0)42 (1.7)3 (0.1)7 (0.3)1 (0.0)1 (0.0)7 (0.3)20 (0.8)38 (1.5)
Average precipitation days (≥ 1 mm)1521231970100247

Monthly sunshine hours in Castelo do Piaui, Brazil

The sunniest months in Castelo do Piaui are August, September and October, when the sun shines an average of 11 hours 21 minutes a day. Least sunny months in Castelo do Piaui: January, February and April 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 Castelo do Piaui. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours250263296296326318328344345355334330
Mean daily daylight hours12h 22m12h 15m12h 6m11h 58m11h 51m11h 48m11h 49m11h 55m12h 3m12h 12m12h 20m12h 24m

Solar UV radiation in Castelo do Piaui, Brazil

Castelo do Piaui 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. June, July and October are in the Extreme exposure category. In these months, the maximum values of the UV index do not exceed 13. For more detailed information, check out our hourly Castelo do Piaui UV Index data.

Average daily maximum UV levels by month for Castelo do Piaui. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)141415151311111313131414