Climate averages 1991–2020
Barra Mansa weather
in September.
A warm, moderately wet month: the joint 7th warmest and the 5th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Barra Mansa: daytime highs average 26.2°C and nights cool to about 15.9°C. By daytime temperature it is the joint 7th warmest of the 12 months.
Expect about 69 mm of rain on roughly 11 days, which makes September a moderately wet month (the 5th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 57 min on an average September day.
The nearest other city in this atlas is Volta Redonda (7 km away). In September its highs average 26.3°C, about as warm as Barra Mansa, with 63 mm of rain.
Among the 448 cities listed in Brazil, Barra Mansa ranks joint 280th of 448 for the warmest September highs and joint 249th of 448 for the driest September (rainfall, lowest first). The mean September high of those 448 cities is 27.5°C; Barra Mansa is 1.4°C cooler than that mean.
From September to October, average highs rise by 0.9°C to 27.0°C, and monthly rainfall rises from 69 mm to 117 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
Barra Mansa climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 28.6°C20.2°C | 20.2°C | 282 | 22.0 | 13.313 h |
| February | 29.1°C20.1°C | 20.1°C | 207 | 17.5 | 12.913 h |
| March | 27.7°C19.6°C | 19.6°C | 194 | 20.3 | 12.212 h |
| April | 26.2°C18.1°C | 18.1°C | 86 | 11.7 | 11.612 h |
| May | 24.1°C15.5°C | 15.5°C | 47 | 8.5 | 11.011 h |
| June | 23.7°C13.9°C | 13.9°C | 27 | 5.4 | 10.811 h |
| July | 23.5°C13.3°C | 13.3°C | 28 | 5.4 | 10.911 h |
| August | 24.9°C14.0°C | 14.0°C | 27 | 5.3 | 11.311 h |
| September, selected | 26.2°C15.9°C | 15.9°C | 69 | 10.8 | 11.912 h |
| October | 27.0°C17.6°C | 17.6°C | 117 | 14.6 | 12.613 h |
| November | 26.6°C18.4°C | 18.4°C | 204 | 18.8 | 13.213 h |
| December | 27.9°C19.7°C | 19.7°C | 248 | 21.3 | 13.513 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
- Volta Redonda in SeptemberBrazil · 7 kmHigh 26.3°C · Low 15.9°C · 63 mm rain
- Resende in SeptemberBrazil · 29 kmHigh 25.2°C · Low 15.2°C · 115 mm rain
- Barra do Piraí in SeptemberBrazil · 36 kmHigh 26.4°C · Low 16.9°C · 66 mm rain
- Seropédica in SeptemberBrazil · 53 kmHigh 27.2°C · Low 17.8°C · 79 mm rain
- Itaguaí in SeptemberBrazil · 53 kmHigh 26.4°C · Low 18.6°C · 79 mm rain
- Angra dos Reis in SeptemberBrazil · 54 kmHigh 25.4°C · Low 19.5°C · 104 mm rain
- Japeri in SeptemberBrazil · 54 kmHigh 28.0°C · Low 18.5°C · 79 mm rain
- Valença (Rio de Janeiro), Brazil in SeptemberBrazil · 59 kmHigh 25.4°C · Low 15.6°C · 76 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 Barra Mansa) is explained once on the Barra Mansa year overview and on the Sources, method and limits page.