Climate averages 1991–2020
Arujá weather
in January.
A warm, very wet month: the 2nd warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
January is a warm month in Arujá: daytime highs average 26.1°C and nights cool to about 18.5°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 253 mm of rain on roughly 24 days, which makes January a very wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 13 h 24 min on an average January day.
The nearest other city in this atlas is Itaquaquecetuba (10 km away). In January its highs average 26.5°C, about as warm as Arujá, with 253 mm of rain.
Among the 448 cities listed in Brazil, Arujá ranks joint 410th of 448 for the warmest January highs and joint 315th of 448 for the driest January (rainfall, lowest first). The mean January high of those 448 cities is 28.5°C; Arujá is 2.3°C cooler than that mean.
From January to February, average highs rise by 0.4°C to 26.5°C, and monthly rainfall falls from 253 mm to 200 mm.
The annual picture
January 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, selected | 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 | 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
January in nearby cities
- Itaquaquecetuba in JanuaryBrazil · 10 kmHigh 26.5°C · Low 19.0°C · 253 mm rain
- Ferraz de Vasconcelos in JanuaryBrazil · 17 kmHigh 26.5°C · Low 19.0°C · 253 mm rain
- Mogi das Cruzes in JanuaryBrazil · 20 kmHigh 26.3°C · Low 18.8°C · 253 mm rain
- Guarulhos in JanuaryBrazil · 23 kmHigh 26.4°C · Low 18.9°C · 232 mm rain
- Mairiporã in JanuaryBrazil · 28 kmHigh 26.8°C · Low 19.1°C · 235 mm rain
- São Caetano do Sul in JanuaryBrazil · 34 kmHigh 26.3°C · Low 19.2°C · 232 mm rain
- Ribeirão Pires in JanuaryBrazil · 36 kmHigh 26.3°C · Low 19.6°C · 337 mm rain
- São Paulo in JanuaryBrazil · 36 kmHigh 26.4°C · Low 19.0°C · 222 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.