Climate averages 1991–2020
Itaboraí weather
in December.
A hot, very 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 hot month in Itaboraí: daytime highs average 28.7°C and nights cool to about 21.6°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 255 mm of rain on roughly 22 days, which makes December a very wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 30 min on an average December day.
The nearest other city in this atlas is Maricá (20 km away). In December its highs average 29.0°C, about as warm as Itaboraí, with 123 mm of rain.
Among the 448 cities listed in Brazil, Itaboraí ranks joint 199th of 448 for the warmest December highs and 401st of 448 for the driest December (rainfall, lowest first). The mean December high of those 448 cities is 28.5°C; Itaboraí is 0.2°C warmer than that mean.
From December to January, average highs rise by 1.0°C to 29.7°C, and monthly rainfall rises from 255 mm to 259 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
Itaboraí climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.7°C22.5°C | 22.5°C | 259 | 21.3 | 13.413 h |
| February | 30.1°C22.5°C | 22.5°C | 203 | 18.2 | 12.913 h |
| March | 28.6°C21.8°C | 21.8°C | 220 | 21.7 | 12.212 h |
| April | 27.0°C20.1°C | 20.1°C | 108 | 14.2 | 11.612 h |
| May | 24.8°C17.5°C | 17.5°C | 77 | 10.9 | 11.011 h |
| June | 24.4°C16.1°C | 16.1°C | 44 | 6.9 | 10.811 h |
| July | 24.1°C15.4°C | 15.4°C | 44 | 7.3 | 10.911 h |
| August | 24.9°C15.8°C | 15.8°C | 43 | 7.4 | 11.311 h |
| September | 25.9°C17.4°C | 17.4°C | 82 | 11.1 | 11.912 h |
| October | 27.0°C19.1°C | 19.1°C | 112 | 13.4 | 12.613 h |
| November | 27.0°C20.1°C | 20.1°C | 210 | 18.7 | 13.213 h |
| December, selected | 28.7°C21.6°C | 21.6°C | 255 | 21.6 | 13.513 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
- Maricá in DecemberBrazil · 20 kmHigh 29.0°C · Low 23.0°C · 123 mm rain
- Magé in DecemberBrazil · 21 kmHigh 29.1°C · Low 21.9°C · 229 mm rain
- São Gonçalo in DecemberBrazil · 22 kmHigh 29.1°C · Low 22.1°C · 229 mm rain
- Rio de Janeiro in DecemberBrazil · 38 kmHigh 29.7°C · Low 22.6°C · 151 mm rain
- Teresópolis in DecemberBrazil · 38 kmHigh 25.4°C · Low 18.5°C · 323 mm rain
- Petrópolis in DecemberBrazil · 42 kmHigh 26.1°C · Low 18.9°C · 295 mm rain
- Saquarema in DecemberBrazil · 43 kmHigh 27.4°C · Low 22.7°C · 122 mm rain
- Duque de Caxias in DecemberBrazil · 47 kmHigh 29.8°C · Low 22.3°C · 237 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 Itaboraí) is explained once on the Itaboraí year overview and on the Sources, method and limits page.