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Teresina weather by month
Historical averages 2016–2025 · not a forecast
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When is the best time to visit Teresina?
For a warm holiday, the best week has been 19–25 July (Weather Index 86). Favourable start dates for a 7-day trip run from 13 June to 26 July. September and October are warmest (37°C), August and September are driest and August, September and October have the most sun.
- Warmest
- September and October 37°C
- Coolest
- March 31°C
- Driest
- August and September 1% rain-day chance
- Wettest
- March 87% rain-day chance
- Sunniest
- August, September and October 12 hours a day
A rain day has 1 mm or more, snow included, so a short shower counts. Monthly averages below give the amounts.
Monthly averages in Teresina
Teresina historical monthly estimates, 2016–2025. Temperatures and sunshine are daily averages.
| Month | High (°C) | Low (°C) | Rain-day chance (%) | Expected rain days | Precipitation (mm/month) | Sunshine (hours/day) |
|---|---|---|---|---|---|---|
| January | 32.1 | 23.6 | 70.6 | 21.9 | 222.9 | 10.0 |
| February | 31.7 | 23.4 | 77.5 | 21.7 | 253.9 | 9.9 |
| March | 31.3 | 23.5 | 86.8 | 26.9 | 333.8 | 9.9 |
| April | 31.7 | 23.6 | 68.3 | 20.5 | 222.7 | 10.5 |
| May | 32.5 | 23.6 | 29.4 | 9.1 | 49.3 | 11.1 |
| June | 33.0 | 23.2 | 4.7 | 1.4 | 9.5 | 11.1 |
| July | 33.6 | 22.9 | 3.5 | 1.1 | 7.1 | 11.3 |
| August | 35.1 | 23.1 | 1.0 | 0.3 | 1.2 | 11.7 |
| September | 36.6 | 24.1 | 1.0 | 0.3 | 1.4 | 11.7 |
| October | 37.1 | 24.7 | 4.8 | 1.5 | 9.1 | 11.6 |
| November | 35.9 | 24.9 | 19.3 | 5.8 | 37.7 | 11.4 |
| December | 34.3 | 24.4 | 32.6 | 10.1 | 79.3 | 10.9 |
Each month averages its own days. Precipitation includes snow. About the data
Sources
Open-Meteo · 1 Jan 2016 – 31 Dec 2025
- Open-Meteo Historical Weather API
- Local days, 2016–2025, every year weighted equally. Each weekly chart averages its own seven days, without smoothing.
- Shading shows the 10th–90th percentile of past days, not forecast confidence.
- A rain day has at least 1 mm, snow included. The last weekly period has eight days.
- Wind is the average daytime (10:00–18:00) maximum, not gusts. Daylight is calculated from latitude. Missing readings stay blank.
- Mugginess (dew point) comes from the original daily summaries, on UTC days.
- The live two-week forecast comes from the Open-Meteo Weather Forecast API. The Weather Index does not use it.