Climate averages 1991–2020
Arujá weather
in September.
A warm, moderately wet month: the 8th warmest and the 6th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Arujá: daytime highs average 24.0°C and nights cool to about 14.1°C. By daytime temperature it is the 8th warmest of the 12 months.
Expect about 89 mm of rain on roughly 10 days, which makes September a moderately wet month (the 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 56 min on an average September day.
The nearest other city in this atlas is Itaquaquecetuba (10 km away). In September its highs average 24.0°C, about as warm as Arujá, with 89 mm of rain.
Among the 448 cities listed in Brazil, Arujá ranks joint 360th of 448 for the warmest September highs and joint 321st of 448 for the driest September (rainfall, lowest first). The mean September high of those 448 cities is 27.5°C; Arujá is 3.6°C cooler than that mean.
From September to October, average highs rise by 0.9°C to 24.8°C, and monthly rainfall rises from 89 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
Arujá climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 26.1°C18.5°C | 18.5°C | 253 | 24.2 | 13.413 h |
| February | 26.5°C18.6°C | 18.6°C | 200 | 20.4 | 12.913 h |
| March | 25.5°C17.9°C | 17.9°C | 171 | 21.1 | 12.212 h |
| April | 24.2°C16.3°C | 16.3°C | 70 | 11.2 | 11.612 h |
| May | 21.7°C13.6°C | 13.6°C | 65 | 8.2 | 11.011 h |
| June | 21.3°C12.1°C | 12.1°C | 45 | 5.5 | 10.711 h |
| July | 21.2°C11.4°C | 11.4°C | 54 | 5.7 | 10.811 h |
| August | 22.6°C12.2°C | 12.2°C | 42 | 5.6 | 11.311 h |
| September, selected | 24.0°C14.1°C | 14.1°C | 89 | 10.2 | 11.912 h |
| October | 24.8°C15.6°C | 15.6°C | 117 | 14.2 | 12.613 h |
| November | 24.6°C16.3°C | 16.3°C | 161 | 17.1 | 13.213 h |
| December | 25.7°C17.7°C | 17.7°C | 198 | 21.2 | 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
- Itaquaquecetuba in SeptemberBrazil · 10 kmHigh 24.0°C · Low 14.5°C · 89 mm rain
- Ferraz de Vasconcelos in SeptemberBrazil · 17 kmHigh 24.1°C · Low 14.6°C · 89 mm rain
- Mogi das Cruzes in SeptemberBrazil · 20 kmHigh 23.7°C · Low 14.2°C · 89 mm rain
- Guarulhos in SeptemberBrazil · 23 kmHigh 24.1°C · Low 14.4°C · 90 mm rain
- Mairiporã in SeptemberBrazil · 28 kmHigh 25.0°C · Low 14.9°C · 83 mm rain
- São Caetano do Sul in SeptemberBrazil · 34 kmHigh 23.7°C · Low 14.4°C · 90 mm rain
- Ribeirão Pires in SeptemberBrazil · 36 kmHigh 23.2°C · Low 14.8°C · 129 mm rain
- São Paulo in SeptemberBrazil · 36 kmHigh 24.2°C · Low 14.5°C · 84 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 Arujá) is explained once on the Arujá year overview and on the Sources, method and limits page.
Itaquaquecetuba, Mogi das Cruzes and Ferraz de Vasconcelos lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.