São João do Piauí climate — normals and trends
São João do Piauí (Brazil) has a hot semi-arid climate (BSh) under the Köppen-Geiger classification. Its mean annual temperature is 27.7 °C and it receives 686 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is October (30.2 °C on average) and the coldest is March (26.2 °C). Rainfall peaks in March.
São João do Piauí averages 0 frost days, 303 hot days (≥ 30 °C) and 83 rainy days per year.
São João do Piauí has warmed by +1.1 °C between 1940 and 2025, or +0.13 °C per decade. This trend is statistically significant.
The hottest day of the period reached 41.3 °C (on 13 November 2015) and the coldest 17.4 °C (on 17 July 1967).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
São João do PiauíPiauí
- coords
- -8.36°, -42.25°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
27.7°C
Average daily high
32.8°C
Average daily low
23.2°C
Annual rainfall
686mm
Sunshine / day
10.9h
Mean relative humidity
57%
Average peak wind
16.5km/h
Seasonal range
4.0°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
303 d/yr
Rainy days (≥ 1 mm)
83 d/yr
Annual snowfall
0.0 cm
Average feels-like high
35.1 °C
Average feels-like low
24.4 °C
Average peak gust
37.2 km/h
Tropical nights (≥ 20 °C)
359 d/yr
Solar radiation
20.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.1 °C
since 1940
+0.1 °C per decade · r² = 0.13 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
41.3 °C
13 November 2015
Coldest day
17.4 °C
17 July 1967
Wettest day
191 mm
10 February 2017
Windiest day
31.8 km/h
15 July 1988
Strongest gust
64.4 km/h
26 August 1949
Hottest feels-like
44.2 °C
31 October 2012
Coldest feels-like
16.0 °C
31 July 1988
Sunniest day
12.5 h
2 December 1940
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 31.0 °C | -0.7 °C | 187 mm | +52 mm |
| Feb | 33.0 °C | +2.1 °C | 6 mm | -129 mm |
| Mar | 33.3 °C | +2.7 °C | 14 mm | -144 mm |
| Apr | 33.6 °C | +2.4 °C | 19 mm | -66 mm |
| May | 33.7 °C | +1.5 °C | 1 mm | -18 mm |
| Jun | 34.4 °C | +2.2 °C | 1 mm | -1 mm |
| Jul | 34.4 °C | +2.1 °C | 0 mm | -1 mm |
| Aug | 35.2 °C | +1.5 °C | 0 mm | -0 mm |
| Sep | 36.2 °C | +0.9 °C | 0 mm | -2 mm |
| Oct | 37.0 °C | +1.2 °C | 6 mm | -10 mm |
| Nov | 36.3 °C | +1.8 °C | 35 mm | -18 mm |
| Dec | 33.7 °C | +0.6 °C | 19 mm | -63 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of São João do Piauí?
São João do Piauí has a hot semi-arid climate (Köppen BSh). Over 1940-2025, the average annual temperature is 27.7 °C and it receives 686 mm of precipitation per year.
What is the hottest day ever recorded in São João do Piauí?
The hottest day measured in São João do Piauí between 1940 and 2025 was 13 November 2015, reaching 41.3 °C.
What is the coldest day in São João do Piauí?
The coldest day measured in São João do Piauí between 1940 and 2025 was 17 July 1967, at 17.4 °C.
Does it snow in São João do Piauí?
Almost never: São João do Piauí sees virtually no snow, with about 0 frost days per year.
Has the climate of São João do Piauí warmed?
Yes: São João do Piauí warmed by +1.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in São João do Piauí?
The wettest day measured in São João do Piauí between 1940 and 2025 was 10 February 2017, with 191 mm of rain in 24 hours.
What was the windiest day in São João do Piauí?
The windiest day measured in São João do Piauí between 1940 and 2025 was 15 July 1988, with winds reaching 31.8 km/h.
What is the warmest month in São João do Piauí?
The warmest month in São João do Piauí is October (30.2 °C on average); the coldest is March (26.2 °C).
How much does it rain in São João do Piauí?
São João do Piauí receives on average 686 mm of precipitation per year, spread over about 83 rainy days.
Is it sunny in São João do Piauí?
São João do Piauí gets on average 10.9 hours of sunshine per day, roughly 3,979 hours per year over 1940-2025.
Are there tropical nights in São João do Piauí?
Yes: São João do Piauí has on average 359 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in São João do Piauí?
In São João do Piauí, between 1940 and 2025, the highest apparent temperature reached 44.2 °C on 31 October 2012, and the lowest was 16.0 °C on 31 July 1988.
Compare São João do Piauí with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around São João do Piauí