Climate averages 1991–2020
Arujá weather
in December.
A warm, very 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 Arujá: daytime highs average 25.7°C and nights cool to about 17.7°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 198 mm of rain on roughly 21 days, which makes December a very wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 33 min on an average December day.
The nearest other city in this atlas is Itaquaquecetuba (10 km away). In December its highs average 26.0°C, about as warm as Arujá, with 198 mm of rain.
Among the 448 cities listed in Brazil, Arujá ranks joint 410th of 448 for the warmest December highs and joint 251st of 448 for the driest December (rainfall, lowest first). The mean December high of those 448 cities is 28.5°C; Arujá is 2.7°C cooler than that mean.
From December to January, average highs rise by 0.4°C to 26.1°C, and monthly rainfall rises from 198 mm to 253 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
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 | 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, selected | 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
December in nearby cities
- Itaquaquecetuba in DecemberBrazil · 10 kmHigh 26.0°C · Low 18.2°C · 198 mm rain
- Ferraz de Vasconcelos in DecemberBrazil · 17 kmHigh 26.0°C · Low 18.2°C · 198 mm rain
- Mogi das Cruzes in DecemberBrazil · 20 kmHigh 25.8°C · Low 18.0°C · 198 mm rain
- Guarulhos in DecemberBrazil · 23 kmHigh 25.9°C · Low 18.0°C · 181 mm rain
- Mairiporã in DecemberBrazil · 28 kmHigh 26.6°C · Low 18.4°C · 186 mm rain
- São Caetano do Sul in DecemberBrazil · 34 kmHigh 25.8°C · Low 18.3°C · 181 mm rain
- Ribeirão Pires in DecemberBrazil · 36 kmHigh 25.7°C · Low 18.7°C · 250 mm rain
- São Paulo in DecemberBrazil · 36 kmHigh 26.0°C · Low 18.2°C · 170 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.