Climate in Piauí

Average daytime and nighttime temperatures

All climatic diagrams on this site result from the collected data from seven measuring weather stations in Piauí.
All data correspond to the average monthly values of the last 20 years.

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Piauí is one of the warmest region in Brazil with an average daily high temperature of 34 degrees centigrade. High humidity and hot temperatures make the weather at times pleasant but also tropical humid. It is yearlong warm or hot. Dued to the lesser rain the best time for traveling is from June to December. Most precipitation decrease from January to May.
Overview: Climate in Brazil
Daylengths and sun positions in Brazil
Compare climate with other regions or countries
Hours of sunshine per daySunshine hours per day in Piauí
The number of hours of sunshine refers to the time when the sun is actually visible. That is, without any obstruction of visibility by clouds, fog or mountains. With 10 hours per day, August is the sunniest month in the state of Piauí. In February the sun shines the shortest.
Rainy days per monthRainy days per month in Piauí
A rainy day is a day on which at least an amount of 0.1 mm precipitation (=0.1 liter) per square meter falls. This can be rain, snow, hail or even dew. So it does not have to rain the whole day. With 18 rainy days, March offers the most number of rainy days, and in September the least.
Precipitation in mm/dayPrecipitation in Piauí
The amount of precipitation is measured in millimeters per square meter. Thus, at two mm/day, two liters of water fall on one square meter within 24 hours. With only 0.3 mm, the least rain falls in August. March, on the other hand, has the most rain.
Relative humidity in %Relative humidity in Piauí
Warm air can absorb more moisture than cold air. The relative humidity indicates how much moisture of the physically possible is actually contained in the air. At high humidity, the person feels uncomfortable and perceives this as oppressive. In general, a relative humidity of 40-60% gives as pleasant. With humidity averaging 87%, April is the most uncomfortable. In September, on the other hand, it is easier to endure.
Absolute humidity in g/m³Absolute humidity in Piauí
In warm months, there is also a higher absolute humidity almost everywhere. At a temperature of 25°C, air can absorb up to 23 grams of water per cubic meter. At 20°C, it is only 17.3 grams. A relative humidity of 40% at 25°C thus corresponds to an absolute humidity of 9.2 grams of water. From a proportion of approx. 13.5 grams, humans perceive the air as muggy. This limit is exceeded throughout the year in Piauí.
Humidex in °CHumidex in Piauí
The "Humidex" (humidity index) is an index of well-being in warmer areas, calculated from the air temperature, relative humidity and dew point. The index corresponds approximately to the temperature felt. At high temperatures, the body transports heat away by sweating. At high humidity the ambient air can only absorb a small amount of sweat and thus one feels uncomfortable. An index of 20-29 is considered comfortable. Up to 39, people perceive the air as slightly uncomfortable, and above 40, as very uncomfortable. Values above 45 are dangerous in the long run and often lead to heat stroke.
Map of Piauí

Most important cities in the federal state »Piauí«

The federal state has a west-east extension of about 380 km and over 690 km from north to south.

CityPopulationGeo position
Teresina815,2705° 5' 21"S42° 48' 7"W
Parnaíba137,4852° 54' 17"S41° 46' 36"W
Picos57,4957° 4' 37"S41° 28' 1"W
Floriano48,5876° 46' 1"S43° 1' 21"W
Piripiri44,8644° 16' 24"S41° 46' 37"W
Campo Maior31,7394° 49' 40"S42° 10' 7"W
Altos28,7685° 2' 17"S42° 27' 36"W
Pedro II22,0384° 25' 29"S41° 27' 31"W
Barras21,5974° 14' 40"S42° 17' 40"W
José de Freitas21,4324° 45' 23"S42° 34' 32"W
Oeiras21,0717° 1' 31"S42° 7' 52"W
Esperantina21,0443° 54' 6"S42° 14' 1"W
São Raimundo Nonato19,5699° 0' 55"S42° 41' 58"W
Piracuruca18,8523° 55' 41"S41° 42' 33"W
Valença do Piauí15,8816° 24' 27"S41° 44' 44"W
União15,6774° 35' 9"S42° 51' 51"W
Demerval Lobão15,2655° 21' 30"S42° 40' 35"W
Água Branca13,9125° 53' 32"S42° 38' 10"W
Regeneração13,6086° 13' 52"S42° 41' 13"W
Luzilândia12,9993° 27' 28"S42° 22' 13"W
São João do Piauí12,6888° 21' 29"S42° 14' 48"W
Bom Jesus12,6669° 4' 28"S44° 21' 31"W
Uruçuí12,2437° 13' 46"S44° 33' 22"W
Cocal12,0973° 28' 19"S41° 33' 27"W
Canto do Buriti11,7148° 6' 36"S42° 56' 40"W
Luís Correia11,4792° 52' 45"S41° 40' 1"W
Miguel Alves10,4384° 9' 56"S42° 53' 43"W
Elesbão Veloso10,4306° 12' 7"S42° 8' 25"W
Buriti dos Lopes9,4753° 10' 30"S41° 52' 1"W
Amarante8,8286° 14' 35"S42° 50' 44"W

Data basis: German Weather Service, individual values averaged and supplemented by own elements. Data on cities and inhabitants:, United Nations Statistics Division and own research.
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