Itaboraí climate
Itaboraí (Rio de Janeiro, Brazil) has a tropical savanna (dry winter) climate (Köppen Aw). The average temperature over the year is 24 °C76 °F, and about 1,357 mm53 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Itaboraí climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 3289 | 2272 | 2780 | 2168.5 |
| Feb | 3289 | 2272 | 2780 | 1405.5 |
| Mar | 3187 | 2171 | 2679 | 1576.2 |
| Apr | 2985 | 2068 | 2576 | 843.3 |
| May | 2781 | 1763 | 2272 | 592.3 |
| Jun | 2780 | 1661 | 2171 | 391.5 |
| Jul | 2781 | 1559 | 2170 | 371.5 |
| Aug | 2984 | 1660 | 2272 | 371.4 |
| Sep | 3187 | 1763 | 2475 | 612.4 |
| Oct | 3289 | 1966 | 2578 | 1003.9 |
| Nov | 3187 | 2068 | 2578 | 1997.8 |
| Dec | 3188 | 2271 | 2680 | 2289.0 |
| Year | 3289 | 1559 | 2476 | 1,35753 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 81% | 69% | 5.8 | 13:23 |
| Feb | 81% | 60% | 6.0 | 12:53 |
| Mar | 83% | 64% | 5.1 | 12:17 |
| Apr | 84% | 55% | 4.5 | 11:35 |
| May | 83% | 55% | 3.7 | 11:02 |
| Jun | 80% | 47% | 3.4 | 10:45 |
| Jul | 77% | 45% | 3.6 | 10:52 |
| Aug | 73% | 44% | 4.2 | 11:20 |
| Sep | 71% | 57% | 4.6 | 11:00 |
| Oct | 72% | 69% | 5.0 | 12:40 |
| Nov | 79% | 78% | 5.0 | 13:15 |
| Dec | 81% | 73% | 5.5 | 13:31 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Itaboraí is like
The warmest month is January, with an average high of 32 °C89 °F and a low of 22 °C72 °F. The coldest is July, when highs average 27 °C81 °F and lows 15 °C59 °F. Seasonal differences are small — just 5.8 °C10.4 °F between the warmest and the coolest month.
It is wet, with about 1,357 mm53 in of precipitation per year. The wettest three-month stretch is November–January, which brings 47% of the annual total. The wettest month is December (228 mm9.0 in), the driest is August (37 mm1.4 in).
Relative humidity ranges from 71% in September to 84% in April. The clearest skies (lowest average cloud amount, 44%) are typical of August. Average wind speed near the ground ranges from 3 km/h (2 mph) in March to 4 km/h (3 mph) in September. Daylight lasts from about 10.7 hours in June to 13.5 hours in December.
Best time to visit Itaboraí
Based on these averages, the most comfortable months for sightseeing and outdoor activities are May–August: average highs of 27 °C80 °F to 29 °C84 °F with 37 mm1.4 in to 59 mm2.3 in of precipitation per month.
The most challenging month is December, which is hot, with average highs of 31 °C88 °F, very wet (228 mm9.0 in) and humid (81% relative humidity).
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Itaboraí
- Wetter months (November–March) — highs 3187 to 32 °C89 °F, lows 2068 to 22 °C72 °F, about 188 mm7.4 in of precipitation a month. Pack very light, breathable clothing, a sun hat and plenty of water and an umbrella or light rain jacket.
- Drier months (April–October) — highs 2780 to 32 °C89 °F, lows 1559 to 20 °C68 °F, about 60 mm2.3 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and an extra layer for the cooler mornings and evenings.
How Itaboraí compares
Compared with Rio de Janeiro, about 38 km to the southwest, Itaboraí is on average 0.5 °C0.9 °F warmer and receives 8% less precipitation (1,357 mm53 in vs 1,469 mm58 in). The difference is largest in October (2 °C3.5 °F warmer).
Of the 223 places in Brazil covered by World Climates, Itaboraí is the 94th warmest by annual mean temperature and the 93rd wettest by annual precipitation. See all of them on the Brazil climate page.
Places in other countries with the most similar temperature and rainfall pattern (seasons shifted for the other hemisphere where needed): West Palm Beach (United States, Am), Santa Cruz de la Sierra (Bolivia, Aw) and Miami (United States, Aw).
The same NASA POWER grid cell also contains Teresópolis (pop. 176,735). Their long-term averages in this dataset are essentially the same as for Itaboraí, so they do not have separate pages.
Nearby places
- Maricá 20 km · 24 °C75 °F · 1,469 mm58 in
- Rio de Janeiro 38 km · 24 °C75 °F · 1,469 mm58 in
- Petrópolis 42 km · 19 °C67 °F · 1,357 mm53 in
- Araruama 55 km · 24 °C75 °F · 1,362 mm54 in
- Nova Iguaçu 61 km · 24 °C75 °F · 1,522 mm60 in
- Nova Friburgo 62 km · 19 °C66 °F · 1,336 mm53 in
- Queimados 71 km · 25 °C76 °F · 1,303 mm51 in
- Cabo Frio 87 km · 24 °C74 °F · 1,319 mm52 in
Frequently asked questions
What is the warmest month in Itaboraí?
January is the warmest month in Itaboraí, with an average high of 32 °C (89 °F) and an average low of 22 °C (72 °F).
What is the coldest month in Itaboraí?
July is the coldest month, with an average high of 27 °C (81 °F) and an average low of 15 °C (59 °F).
When does it rain the most in Itaboraí?
December is the wettest month with about 228 mm (9.0 in) of precipitation; August is the driest with about 37 mm (1.4 in).
What is the best time to visit Itaboraí?
Judging by long-term averages, the most comfortable months are May–August.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.
The grid cell’s average elevation is 420 m, while Itaboraí lies at about 47 m. Temperatures on this page were therefore adjusted by +2.4 °C4.4 °F using the standard lapse rate of 6.5 °C per 1,000 m.