Climate averages 1991–2020
Piracicaba weather
in September.
A hot, moderately wet month: the 5th warmest and the 6th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Piracicaba: daytime highs average 28.4°C and nights cool to about 16.3°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 61 mm of rain on roughly 8 days, which makes September a moderately wet month (the 6th 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 Santa Bárbara d'Oeste (24 km away). In September its highs average 27.9°C, about as warm as Piracicaba, with 70 mm of rain.
Among the 448 cities listed in Brazil, Piracicaba ranks joint 168th of 448 for the warmest September highs and joint 210th of 448 for the driest September (rainfall, lowest first). The mean September high of those 448 cities is 27.5°C; Piracicaba is 0.8°C warmer than that mean.
From September to October, average highs rise by 0.6°C to 28.9°C, and monthly rainfall rises from 61 mm to 104 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
Piracicaba climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 28.6°C20.4°C | 20.4°C | 255 | 22.2 | 13.413 h |
| February | 28.9°C20.4°C | 20.4°C | 187 | 19.2 | 12.913 h |
| March | 28.1°C19.6°C | 19.6°C | 144 | 17.0 | 12.212 h |
| April | 27.2°C17.7°C | 17.7°C | 53 | 7.3 | 11.612 h |
| May | 24.6°C14.7°C | 14.7°C | 52 | 6.0 | 11.011 h |
| June | 24.1°C13.3°C | 13.3°C | 38 | 4.4 | 10.811 h |
| July | 24.4°C12.8°C | 12.8°C | 31 | 3.8 | 10.911 h |
| August | 26.5°C13.8°C | 13.8°C | 30 | 3.9 | 11.311 h |
| September, selected | 28.4°C16.3°C | 16.3°C | 61 | 7.9 | 11.912 h |
| October | 28.9°C18.0°C | 18.0°C | 104 | 12.1 | 12.613 h |
| November | 28.3°C18.6°C | 18.6°C | 148 | 14.9 | 13.213 h |
| December | 28.8°C19.9°C | 19.9°C | 190 | 19.8 | 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
- Santa Bárbara d'Oeste in SeptemberBrazil · 24 kmHigh 27.9°C · Low 16.3°C · 70 mm rain
- Limeira in SeptemberBrazil · 31 kmHigh 28.2°C · Low 16.2°C · 72 mm rain
- Americana in SeptemberBrazil · 33 kmHigh 28.0°C · Low 16.2°C · 78 mm rain
- Rio Claro in SeptemberBrazil · 36 kmHigh 27.9°C · Low 15.7°C · 72 mm rain
- Sumaré in SeptemberBrazil · 41 kmHigh 27.9°C · Low 16.1°C · 78 mm rain
- Hortolândia in SeptemberBrazil · 46 kmHigh 27.6°C · Low 16.1°C · 78 mm rain
- Cosmópolis in SeptemberBrazil · 47 kmHigh 28.1°C · Low 16.3°C · 78 mm rain
- Araras in SeptemberBrazil · 49 kmHigh 27.9°C · Low 16.2°C · 71 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 Piracicaba) is explained once on the Piracicaba year overview and on the Sources, method and limits page.