Climate averages 1991–2020
São José de Ribamar weather
in September.
A hot, very dry month: the warmest and the driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in São José de Ribamar: daytime highs average 30.1°C and nights cool to about 25.8°C. By daytime temperature it is the warmest month of the year.
Expect about 11 mm of rain on roughly 3 days, which makes September a very dry month (the driest month of the year). Daylight, from sunrise to sunset, lasts about 12 h 06 min on an average September day.
The nearest other city in this atlas is São Luís (27 km away). In September its highs average 31.2°C, 1.1°C warmer than São José de Ribamar, with 11 mm of rain.
Among the 448 cities listed in Brazil, São José de Ribamar ranks joint 128th of 448 for the warmest September highs and joint 47th of 448 for the driest September (rainfall, lowest first). The mean September high of those 448 cities is 27.5°C; São José de Ribamar is 2.5°C warmer than that mean.
From September to October, average highs fall by 0.1°C to 30.0°C, and monthly rainfall rises from 11 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
São José de Ribamar climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 28.4°C25.0°C | 25.0°C | 229 | 25.4 | 12.212 h |
| February | 28.0°C24.7°C | 24.7°C | 319 | 26.2 | 12.212 h |
| March | 27.9°C24.6°C | 24.6°C | 452 | 30.2 | 12.112 h |
| April | 28.1°C24.6°C | 24.6°C | 437 | 28.7 | 12.112 h |
| May | 28.6°C25.0°C | 25.0°C | 292 | 26.5 | 12.012 h |
| June | 28.9°C25.1°C | 25.1°C | 146 | 21.8 | 12.012 h |
| July | 29.1°C25.2°C | 25.2°C | 94 | 18.4 | 12.012 h |
| August | 29.8°C25.6°C | 25.6°C | 25 | 7.5 | 12.012 h |
| September, selected | 30.1°C25.8°C | 25.8°C | 11 | 2.8 | 12.112 h |
| October | 30.0°C25.9°C | 25.9°C | 15 | 3.7 | 12.212 h |
| November | 29.7°C26.0°C | 26.0°C | 28 | 6.3 | 12.212 h |
| December | 29.3°C25.8°C | 25.8°C | 75 | 15.0 | 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
- São Luís in SeptemberBrazil · 27 kmHigh 31.2°C · Low 25.5°C · 11 mm rain
- Pinheiro in SeptemberBrazil · 114 kmHigh 32.0°C · Low 24.2°C · 14 mm rain
- Chapadinha in SeptemberBrazil · 153 kmHigh 34.9°C · Low 24.2°C · 3.5 mm rain
- Santa Inês in SeptemberBrazil · 192 kmHigh 34.0°C · Low 24.3°C · 12 mm rain
- Bacabal in SeptemberBrazil · 203 kmHigh 34.9°C · Low 24.7°C · 7.4 mm rain
- Codó in SeptemberBrazil · 212 kmHigh 35.2°C · Low 24.2°C · 6.2 mm rain
- Parnaíba in SeptemberBrazil · 257 kmHigh 33.8°C · Low 25.0°C · 1.1 mm rain
- Caxias in SeptemberBrazil · 268 kmHigh 36.1°C · Low 23.9°C · 5.0 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 São José de Ribamar) is explained once on the São José de Ribamar year overview and on the Sources, method and limits page.