Climate averages 1991–2020
São Pedro da Aldeia weather
in September.
A warm, moderately wet month: the 9th warmest and the 4th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in São Pedro da Aldeia: daytime highs average 23.9°C and nights cool to about 19.7°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 56 mm of rain on roughly 8 days, which makes September a moderately wet month (the 4th 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 Cabo Frio (9 km away). In September its highs average 23.8°C, about as warm as São Pedro da Aldeia, with 47 mm of rain.
Among the 448 cities listed in Brazil, São Pedro da Aldeia ranks joint 364th of 448 for the warmest September highs and joint 190th of 448 for the driest September (rainfall, lowest first). The mean September high of those 448 cities is 27.5°C; São Pedro da Aldeia is 3.6°C cooler than that mean.
From September to October, average highs rise by 0.7°C to 24.7°C, and monthly rainfall rises from 56 mm to 75 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 Pedro da Aldeia climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 27.3°C23.4°C | 23.4°C | 130 | 11.0 | 13.413 h |
| February | 27.7°C23.7°C | 23.7°C | 88 | 8.2 | 12.913 h |
| March | 27.1°C23.4°C | 23.4°C | 125 | 13.1 | 12.212 h |
| April | 26.0°C22.2°C | 22.2°C | 64 | 10.0 | 11.612 h |
| May | 24.1°C20.3°C | 20.3°C | 57 | 9.7 | 11.011 h |
| June | 23.6°C19.3°C | 19.3°C | 32 | 6.0 | 10.811 h |
| July | 23.2°C18.8°C | 18.8°C | 33 | 6.6 | 10.911 h |
| August | 23.4°C19.0°C | 19.0°C | 31 | 6.4 | 11.311 h |
| September, selected | 23.9°C19.7°C | 19.7°C | 56 | 8.3 | 11.912 h |
| October | 24.7°C20.7°C | 20.7°C | 75 | 9.0 | 12.613 h |
| November | 25.2°C21.4°C | 21.4°C | 139 | 13.3 | 13.213 h |
| December | 26.5°C22.7°C | 22.7°C | 142 | 13.3 | 13.514 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
- Cabo Frio in SeptemberBrazil · 9 kmHigh 23.8°C · Low 20.0°C · 47 mm rain
- Araruama in SeptemberBrazil · 25 kmHigh 23.9°C · Low 19.7°C · 74 mm rain
- Saquarema in SeptemberBrazil · 38 kmHigh 24.5°C · Low 19.3°C · 58 mm rain
- Rio das Ostras in SeptemberBrazil · 38 kmHigh 25.7°C · Low 18.9°C · 73 mm rain
- Macaé in SeptemberBrazil · 60 kmHigh 25.4°C · Low 19.2°C · 60 mm rain
- Maricá in SeptemberBrazil · 74 kmHigh 26.0°C · Low 19.2°C · 61 mm rain
- Nova Friburgo in SeptemberBrazil · 76 kmHigh 23.8°C · Low 15.2°C · 117 mm rain
- Itaboraí in SeptemberBrazil · 78 kmHigh 25.9°C · Low 17.4°C · 82 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 Pedro da Aldeia) is explained once on the São Pedro da Aldeia year overview and on the Sources, method and limits page.