Climate averages 1991–2020
Teresina weather
in September.
A very hot, very dry month: the 2nd warmest and the 2nd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a very hot month in Teresina: daytime highs average 36.5°C and nights cool to about 24.1°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 3.3 mm of rain on fewer than one day, which makes September a very dry month (the 2nd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 04 min on an average September day.
The nearest other city in this atlas is Caxias (67 km away). In September its highs average 36.1°C, about as warm as Teresina, with 5.0 mm of rain.
Among the 448 cities listed in Brazil, Teresina ranks 1st of 448 for the warmest September highs and 26th of 448 for the driest September (rainfall, lowest first). The mean September high of those 448 cities is 27.5°C; Teresina is 9.0°C warmer than that mean.
From September to October, average highs rise by 0.4°C to 36.9°C, and monthly rainfall rises from 3.3 mm to 15 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Teresina climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 31.0°C23.2°C | 23.2°C | 235 | 22.5 | 12.412 h |
| February | 30.2°C22.9°C | 22.9°C | 283 | 22.8 | 12.312 h |
| March | 29.9°C22.9°C | 22.9°C | 328 | 26.9 | 12.112 h |
| April | 29.9°C23.0°C | 23.0°C | 264 | 23.3 | 12.012 h |
| May | 30.9°C23.1°C | 23.1°C | 124 | 12.7 | 11.912 h |
| June | 32.6°C23.2°C | 23.2°C | 16 | 2.9 | 11.812 h |
| July | 33.5°C23.2°C | 23.2°C | 8.7 | 1.5 | 11.912 h |
| August | 35.0°C23.5°C | 23.5°C | 2.1 | 0.5 | 11.912 h |
| September, selected | 36.5°C24.1°C | 24.1°C | 3.3 | 0.9 | 12.112 h |
| October | 36.9°C24.5°C | 24.5°C | 15 | 2.0 | 12.212 h |
| November | 35.6°C24.6°C | 24.6°C | 41 | 5.8 | 12.312 h |
| December | 33.8°C24.2°C | 24.2°C | 93 | 11.4 | 12.412 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Caxias in SeptemberBrazil · 67 kmHigh 36.1°C · Low 23.9°C · 5.0 mm rain
- Codó in SeptemberBrazil · 139 kmHigh 35.2°C · Low 24.2°C · 6.2 mm rain
- Chapadinha in SeptemberBrazil · 162 kmHigh 34.9°C · Low 24.2°C · 3.5 mm rain
- Crateús in SeptemberBrazil · 236 kmHigh 34.3°C · Low 22.5°C · 1.3 mm rain
- Bacabal in SeptemberBrazil · 239 kmHigh 34.9°C · Low 24.7°C · 7.4 mm rain
- Tianguá in SeptemberBrazil · 251 kmHigh 30.9°C · Low 19.6°C · 1.2 mm rain
- Picos in SeptemberBrazil · 266 kmHigh 35.7°C · Low 24.2°C · 1.7 mm rain
- Parnaíba in SeptemberBrazil · 268 kmHigh 33.8°C · Low 25.0°C · 1.1 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Teresina) is explained once on the Teresina year overview and on the Sources, method and limits page.