Climate averages 1991–2020
Santa Inês 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 Santa Inês: daytime highs average 34.0°C and nights cool to about 24.3°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 12 mm of rain on roughly 2 days, which makes September a very dry month (the 2nd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 05 min on an average September day.
The nearest other city in this atlas is Bacabal (91 km away). In September its highs average 34.9°C, 0.9°C warmer than Santa Inês, with 7.4 mm of rain.
Among the 448 cities listed in Brazil, Santa Inês ranks joint 27th of 448 for the warmest September highs and joint 49th of 448 for the driest September (rainfall, lowest first). The mean September high of those 448 cities is 27.5°C; Santa Inês is 6.5°C warmer than that mean.
From September to October, average highs rise by 0.3°C to 34.4°C, and monthly rainfall rises from 12 mm to 19 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
Santa Inês climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 30.2°C23.6°C | 23.6°C | 253 | 25.4 | 12.312 h |
| February | 29.6°C23.4°C | 23.4°C | 278 | 26.0 | 12.212 h |
| March | 29.4°C23.3°C | 23.3°C | 341 | 29.5 | 12.112 h |
| April | 29.4°C23.4°C | 23.4°C | 310 | 27.9 | 12.012 h |
| May | 29.8°C23.5°C | 23.5°C | 163 | 21.5 | 12.012 h |
| June | 30.3°C23.3°C | 23.3°C | 55 | 11.6 | 11.912 h |
| July | 31.2°C23.1°C | 23.1°C | 32 | 6.4 | 11.912 h |
| August | 33.0°C23.6°C | 23.6°C | 11 | 2.8 | 12.012 h |
| September, selected | 34.0°C24.3°C | 24.3°C | 12 | 2.1 | 12.112 h |
| October | 34.4°C24.8°C | 24.8°C | 19 | 4.0 | 12.212 h |
| November | 33.7°C24.8°C | 24.8°C | 49 | 8.0 | 12.312 h |
| December | 32.3°C24.5°C | 24.5°C | 120 | 15.3 | 12.312 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
- Bacabal in SeptemberBrazil · 91 kmHigh 34.9°C · Low 24.7°C · 7.4 mm rain
- Pinheiro in SeptemberBrazil · 132 kmHigh 32.0°C · Low 24.2°C · 14 mm rain
- São Luís in SeptemberBrazil · 174 kmHigh 31.2°C · Low 25.5°C · 11 mm rain
- Codó in SeptemberBrazil · 188 kmHigh 35.2°C · Low 24.2°C · 6.2 mm rain
- São José de Ribamar in SeptemberBrazil · 192 kmHigh 30.1°C · Low 25.8°C · 11 mm rain
- Barra do Corda in SeptemberBrazil · 205 kmHigh 34.9°C · Low 23.9°C · 10 mm rain
- Chapadinha in SeptemberBrazil · 224 kmHigh 34.9°C · Low 24.2°C · 3.5 mm rain
- Paragominas in SeptemberBrazil · 232 kmHigh 34.1°C · Low 23.4°C · 13 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 Santa Inês) is explained once on the Santa Inês year overview and on the Sources, method and limits page.