Climate averages 1991–2020
Jacareí 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 Jacareí: daytime highs average 25.2°C and nights cool to about 14.9°C. By daytime temperature it is the 8th warmest of the 12 months.
Expect about 77 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 São José dos Campos (16 km away). In September its highs average 25.5°C, about as warm as Jacareí, with 77 mm of rain.
Among the 448 cities listed in Brazil, Jacareí ranks joint 333rd 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; Jacareí is 2.3°C cooler than that mean.
From September to October, average highs rise by 0.9°C to 26.1°C, and monthly rainfall rises from 77 mm to 109 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
Jacareí climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 27.4°C19.5°C | 19.5°C | 226 | 21.9 | 13.413 h |
| February | 27.8°C19.6°C | 19.6°C | 173 | 18.6 | 12.913 h |
| March | 26.7°C18.9°C | 18.9°C | 139 | 18.0 | 12.212 h |
| April | 25.5°C17.2°C | 17.2°C | 57 | 9.5 | 11.612 h |
| May | 23.0°C14.3°C | 14.3°C | 57 | 7.6 | 11.011 h |
| June | 22.6°C12.8°C | 12.8°C | 38 | 5.1 | 10.711 h |
| July | 22.5°C12.0°C | 12.0°C | 44 | 5.1 | 10.811 h |
| August | 23.9°C12.9°C | 12.9°C | 35 | 5.3 | 11.311 h |
| September, selected | 25.2°C14.9°C | 14.9°C | 77 | 9.9 | 11.912 h |
| October | 26.1°C16.6°C | 16.6°C | 109 | 13.5 | 12.613 h |
| November | 25.9°C17.3°C | 17.3°C | 142 | 16.6 | 13.213 h |
| December | 27.0°C18.7°C | 18.7°C | 172 | 20.1 | 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
- São José dos Campos in SeptemberBrazil · 16 kmHigh 25.5°C · Low 15.0°C · 77 mm rain
- Mogi das Cruzes in SeptemberBrazil · 33 kmHigh 23.7°C · Low 14.2°C · 89 mm rain
- Caçapava in SeptemberBrazil · 35 kmHigh 25.6°C · Low 15.0°C · 89 mm rain
- Arujá in SeptemberBrazil · 38 kmHigh 24.0°C · Low 14.1°C · 89 mm rain
- Itaquaquecetuba in SeptemberBrazil · 44 kmHigh 24.0°C · Low 14.5°C · 89 mm rain
- Ferraz de Vasconcelos in SeptemberBrazil · 49 kmHigh 24.1°C · Low 14.6°C · 89 mm rain
- Taubaté in SeptemberBrazil · 52 kmHigh 25.6°C · Low 14.7°C · 83 mm rain
- Guarulhos in SeptemberBrazil · 61 kmHigh 24.1°C · Low 14.4°C · 90 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 Jacareí) is explained once on the Jacareí year overview and on the Sources, method and limits page.
São José dos Campos lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.