Climate averages 1991–2020
Osasco weather
in December.
A warm, wet month: the 3rd warmest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a warm month in Osasco: daytime highs average 26.2°C and nights cool to about 18.1°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 170 mm of rain on roughly 20 days, which makes December a wet month (the 11th 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 Barueri (9 km away). In December its highs average 26.4°C, about as warm as Osasco, with 181 mm of rain.
Among the 448 cities listed in Brazil, Osasco ranks joint 377th of 448 for the warmest December highs and joint 177th of 448 for the driest December (rainfall, lowest first). The mean December high of those 448 cities is 28.5°C; Osasco is 2.3°C cooler than that mean.
From December to January, average highs rise by 0.3°C to 26.5°C, and monthly rainfall rises from 170 mm to 222 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
Osasco climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 26.5°C18.9°C | 18.9°C | 222 | 23.0 | 13.413 h |
| February | 26.8°C19.0°C | 19.0°C | 165 | 19.8 | 12.913 h |
| March | 25.9°C18.3°C | 18.3°C | 139 | 19.0 | 12.212 h |
| April | 24.6°C16.6°C | 16.6°C | 60 | 9.5 | 11.612 h |
| May | 22.1°C13.9°C | 13.9°C | 58 | 7.1 | 11.011 h |
| June | 21.6°C12.6°C | 12.6°C | 45 | 5.3 | 10.711 h |
| July | 21.6°C11.9°C | 11.9°C | 49 | 5.4 | 10.811 h |
| August | 23.1°C12.6°C | 12.6°C | 36 | 4.8 | 11.311 h |
| September | 24.5°C14.4°C | 14.4°C | 84 | 9.3 | 11.912 h |
| October | 25.3°C15.9°C | 15.9°C | 109 | 13.5 | 12.613 h |
| November | 25.0°C16.5°C | 16.5°C | 145 | 15.8 | 13.213 h |
| December, selected | 26.2°C18.1°C | 18.1°C | 170 | 20.1 | 13.614 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
- Barueri in DecemberBrazil · 9 kmHigh 26.4°C · Low 18.3°C · 181 mm rain
- Taboão da Serra in DecemberBrazil · 10 kmHigh 25.6°C · Low 17.9°C · 222 mm rain
- Embu das Artes in DecemberBrazil · 14 kmHigh 25.9°C · Low 18.1°C · 222 mm rain
- São Paulo in DecemberBrazil · 16 kmHigh 26.0°C · Low 18.2°C · 170 mm rain
- Santana de Parnaíba in DecemberBrazil · 16 kmHigh 26.5°C · Low 18.4°C · 181 mm rain
- Caieiras in DecemberBrazil · 19 kmHigh 26.0°C · Low 17.9°C · 210 mm rain
- Itapecerica da Serra in DecemberBrazil · 21 kmHigh 24.7°C · Low 17.2°C · 222 mm rain
- São Caetano do Sul in DecemberBrazil · 27 kmHigh 25.8°C · Low 18.3°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 Osasco) is explained once on the Osasco year overview and on the Sources, method and limits page.
São Paulo lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.