Climate Insights for São João do Piauí

The climate in São João do Piauí is warm and mild. The average annual temperature is 25°C and approximately 276mm of precipitation falls per year. December is the wettest month, receiving around 33mm of rainfall. São João do Piauí sits near the equator, so seasonal temperature differences are minimal throughout the year.

São João do Piauí sees moderate temperature variation throughout the year, ranging from 13°C to 29°C. The warmest month is January, when average highs reach 29°C and the mean temperature sits around 21°C. February is the coolest month, with minimum temperatures around 13°C and an average of 19°C. Daily temperature variation is modest, with an average difference of 4°C between highs and lows. The sharpest temperature change occurs between March and April, with a 5°C shift in average temperatures.

São João do Piauí is a quite dry location, receiving approximately 276mm of precipitation annually, which averages out to around 23mm per month. The wettest month is April, averaging 33mm of rainfall. May and June also tend to see above-average precipitation. The driest month is January, with just 0mm. That's 33mm less than April, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.

São João do Piauí is relatively calm, with an average annual wind speed of 5km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is May, averaging 11km/h, though still comfortable for most outdoor activities. The calmest conditions occur in November, with average winds dropping to 2km/h, making it an ideal period for wind-sensitive activities. Wind speeds vary significantly across the year, with a 9km/h difference between the calmest and windiest months. This level of variation is worth factoring into travel plans. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 7km/h in winter, 4km/h in spring, 4km/h in summer, 6km/h in autumn.

It is currently winter in São João do Piauí, which began on June 21, 2026. São João do Piauí sits near the equator, so the traditional four-season cycle is less pronounced. Temperatures remain relatively stable year-round. The warmest period peaks in January at around 29°C, while the coldest stretch bottoms out in February near 13°C. Spring is next, beginning on September 23, 2026 (16 days from now).

The best time to visit São João do Piauí is during January, February, March and April, when the weather is most comfortable for travellers. During these months, average temperatures hover around 21°C with modest rainfall averaging 9mm per month. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for São João do Piauí based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.