Climate averages 1991–2020
Itaguaí weather
in December.
A hot, very wet month: the joint 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 Itaguaí: daytime highs average 29.2°C and nights cool to about 22.6°C. By daytime temperature it is the joint 3rd warmest of the 12 months.
Expect about 226 mm of rain on roughly 21 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 Seropédica (14 km away). In December its highs average 29.6°C, about as warm as Itaguaí, with 226 mm of rain.
Among the 448 cities listed in Brazil, Itaguaí ranks joint 159th of 448 for the warmest December highs and joint 322nd of 448 for the driest December (rainfall, lowest first). The mean December high of those 448 cities is 28.5°C; Itaguaí is 0.7°C warmer than that mean.
From December to January, average highs rise by 1.0°C to 30.2°C, and monthly rainfall rises from 226 mm to 273 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
Itaguaí climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 30.2°C23.6°C | 23.6°C | 273 | 20.9 | 13.413 h |
| February | 30.7°C23.8°C | 23.8°C | 199 | 17.7 | 12.913 h |
| March | 29.2°C23.0°C | 23.0°C | 200 | 20.2 | 12.212 h |
| April | 27.6°C21.3°C | 21.3°C | 106 | 13.0 | 11.612 h |
| May | 25.4°C18.8°C | 18.8°C | 67 | 10.2 | 11.011 h |
| June | 25.0°C17.4°C | 17.4°C | 40 | 6.7 | 10.811 h |
| July | 24.7°C16.7°C | 16.7°C | 40 | 6.3 | 10.911 h |
| August | 25.6°C17.1°C | 17.1°C | 35 | 6.7 | 11.311 h |
| September | 26.4°C18.6°C | 18.6°C | 79 | 11.0 | 11.912 h |
| October | 27.5°C20.1°C | 20.1°C | 114 | 13.9 | 12.613 h |
| November | 27.5°C21.1°C | 21.1°C | 190 | 18.6 | 13.213 h |
| December, selected | 29.2°C22.6°C | 22.6°C | 226 | 20.7 | 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
- Seropédica in DecemberBrazil · 14 kmHigh 29.6°C · Low 21.8°C · 226 mm rain
- Japeri in DecemberBrazil · 26 kmHigh 30.3°C · Low 22.3°C · 226 mm rain
- Queimados in DecemberBrazil · 27 kmHigh 29.8°C · Low 21.8°C · 192 mm rain
- Nova Iguaçu in DecemberBrazil · 35 kmHigh 30.0°C · Low 22.3°C · 192 mm rain
- Belford Roxo in DecemberBrazil · 40 kmHigh 30.0°C · Low 22.5°C · 192 mm rain
- Barra do Piraí in DecemberBrazil · 43 kmHigh 28.5°C · Low 20.5°C · 248 mm rain
- Barra da Tijuca in DecemberBrazil · 45 kmHigh 30.2°C · Low 23.0°C · 151 mm rain
- Duque de Caxias in DecemberBrazil · 48 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 Itaguaí) is explained once on the Itaguaí year overview and on the Sources, method and limits page.
Japeri and Seropédica lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.