Climate averages 1991–2020
São João da Boa Vista weather
in September.
A warm, moderately wet month: the 3rd 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 São João da Boa Vista: daytime highs average 27.7°C and nights cool to about 16.2°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 77 mm of rain on roughly 9 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 Poços de Caldas (32 km away). In September its highs average 24.9°C, 2.8°C cooler than São João da Boa Vista, with 92 mm of rain.
Among the 448 cities listed in Brazil, São João da Boa Vista ranks joint 202nd of 448 for the warmest September highs and joint 273rd of 448 for the driest September (rainfall, lowest first). The mean September high of those 448 cities is 27.5°C; São João da Boa Vista is 0.1°C warmer than that mean.
From September to October, average highs rise by 0.5°C to 28.1°C, and monthly rainfall rises from 77 mm to 122 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 João da Boa Vista climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 27.6°C19.5°C | 19.5°C | 282 | 24.0 | 13.313 h |
| February | 27.8°C19.4°C | 19.4°C | 213 | 20.3 | 12.813 h |
| March | 27.2°C18.6°C | 18.6°C | 183 | 19.9 | 12.212 h |
| April | 26.3°C16.7°C | 16.7°C | 80 | 10.3 | 11.612 h |
| May | 23.9°C13.7°C | 13.7°C | 56 | 6.4 | 11.111 h |
| June | 23.5°C12.5°C | 12.5°C | 32 | 4.1 | 10.811 h |
| July | 23.8°C12.2°C | 12.2°C | 27 | 3.3 | 10.911 h |
| August | 25.8°C13.5°C | 13.5°C | 26 | 3.7 | 11.411 h |
| September, selected | 27.7°C16.2°C | 16.2°C | 77 | 8.7 | 12.012 h |
| October | 28.1°C18.0°C | 18.0°C | 122 | 14.5 | 12.613 h |
| November | 27.2°C18.4°C | 18.4°C | 191 | 19.4 | 13.113 h |
| December | 27.5°C19.2°C | 19.2°C | 245 | 23.4 | 13.413 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
- Poços de Caldas in SeptemberBrazil · 32 kmHigh 24.9°C · Low 14.4°C · 92 mm rain
- Mogi Guaçu in SeptemberBrazil · 47 kmHigh 28.1°C · Low 16.2°C · 76 mm rain
- Itapira in SeptemberBrazil · 52 kmHigh 28.0°C · Low 16.5°C · 85 mm rain
- Mogi Mirim in SeptemberBrazil · 54 kmHigh 28.1°C · Low 16.1°C · 86 mm rain
- Pirassununga in SeptemberBrazil · 65 kmHigh 28.6°C · Low 16.6°C · 65 mm rain
- Leme in SeptemberBrazil · 66 kmHigh 28.4°C · Low 16.3°C · 71 mm rain
- Araras in SeptemberBrazil · 74 kmHigh 27.9°C · Low 16.2°C · 71 mm rain
- Cosmópolis in SeptemberBrazil · 86 kmHigh 28.1°C · Low 16.3°C · 78 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 João da Boa Vista) is explained once on the São João da Boa Vista year overview and on the Sources, method and limits page.