Climate averages 1991–2020
Jacareí weather
in December.
A warm, wet month: the 3rd warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a warm month in Jacareí: daytime highs average 27.0°C and nights cool to about 18.7°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 172 mm of rain on roughly 20 days, which makes December a wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 32 min on an average December day.
The nearest other city in this atlas is São José dos Campos (16 km away). In December its highs average 27.2°C, about as warm as Jacareí, with 172 mm of rain.
Among the 448 cities listed in Brazil, Jacareí ranks joint 320th of 448 for the warmest December highs and joint 181st of 448 for the driest December (rainfall, lowest first). The mean December high of those 448 cities is 28.5°C; Jacareí is 1.4°C cooler than that mean.
From December to January, average highs rise by 0.4°C to 27.4°C, and monthly rainfall rises from 172 mm to 226 mm.
The annual picture
December 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 | 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, selected | 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
December in nearby cities
- São José dos Campos in DecemberBrazil · 16 kmHigh 27.2°C · Low 18.7°C · 172 mm rain
- Mogi das Cruzes in DecemberBrazil · 33 kmHigh 25.8°C · Low 18.0°C · 198 mm rain
- Caçapava in DecemberBrazil · 35 kmHigh 27.2°C · Low 18.7°C · 227 mm rain
- Arujá in DecemberBrazil · 38 kmHigh 25.7°C · Low 17.7°C · 198 mm rain
- Itaquaquecetuba in DecemberBrazil · 44 kmHigh 26.0°C · Low 18.2°C · 198 mm rain
- Ferraz de Vasconcelos in DecemberBrazil · 49 kmHigh 26.0°C · Low 18.2°C · 198 mm rain
- Taubaté in DecemberBrazil · 52 kmHigh 27.1°C · Low 18.4°C · 219 mm rain
- Guarulhos in DecemberBrazil · 61 kmHigh 25.9°C · Low 18.0°C · 181 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.