Climate averages 1991–2020
Jaú weather
in September.
A hot, moderately wet month: the 4th 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 Jaú: daytime highs average 28.8°C and nights cool to about 17.1°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 64 mm of rain on roughly 7 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 Bauru (52 km away). In September its highs average 28.8°C, about as warm as Jaú, with 64 mm of rain.
Among the 448 cities listed in Brazil, Jaú ranks joint 156th of 448 for the warmest September highs and joint 225th of 448 for the driest September (rainfall, lowest first). The mean September high of those 448 cities is 27.5°C; Jaú is 1.3°C warmer than that mean.
From September to October, average highs rise by 0.5°C to 29.4°C, and monthly rainfall rises from 64 mm to 110 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
Jaú climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 28.7°C20.9°C | 20.9°C | 247 | 22.0 | 13.313 h |
| February | 29.0°C20.9°C | 20.9°C | 182 | 19.2 | 12.913 h |
| March | 28.3°C20.2°C | 20.2°C | 139 | 17.3 | 12.212 h |
| April | 27.5°C18.5°C | 18.5°C | 58 | 8.0 | 11.612 h |
| May | 24.9°C15.6°C | 15.6°C | 56 | 6.2 | 11.111 h |
| June | 24.4°C14.3°C | 14.3°C | 37 | 4.1 | 10.811 h |
| July | 24.8°C13.9°C | 13.9°C | 27 | 3.5 | 10.911 h |
| August | 27.0°C15.0°C | 15.0°C | 29 | 3.6 | 11.311 h |
| September, selected | 28.8°C17.1°C | 17.1°C | 64 | 7.4 | 11.912 h |
| October | 29.4°C18.8°C | 18.8°C | 110 | 12.6 | 12.613 h |
| November | 28.7°C19.3°C | 19.3°C | 156 | 15.5 | 13.213 h |
| December | 29.0°C20.5°C | 20.5°C | 191 | 20.2 | 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
- Bauru in SeptemberBrazil · 52 kmHigh 28.8°C · Low 17.1°C · 64 mm rain
- Botucatu in SeptemberBrazil · 67 kmHigh 25.7°C · Low 14.3°C · 86 mm rain
- Araraquara in SeptemberBrazil · 68 kmHigh 28.6°C · Low 17.3°C · 67 mm rain
- São Carlos in SeptemberBrazil · 75 kmHigh 27.5°C · Low 15.8°C · 65 mm rain
- Matão in SeptemberBrazil · 80 kmHigh 29.6°C · Low 18.2°C · 71 mm rain
- Avaré in SeptemberBrazil · 97 kmHigh 25.7°C · Low 14.9°C · 74 mm rain
- Rio Claro in SeptemberBrazil · 103 kmHigh 27.9°C · Low 15.7°C · 72 mm rain
- Piracicaba in SeptemberBrazil · 105 kmHigh 28.4°C · Low 16.3°C · 61 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 Jaú) is explained once on the Jaú year overview and on the Sources, method and limits page.