Climate averages 1991–2020
Itaboraí weather
in May.
A warm, moderately wet month: the 10th warmest and the 4th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a warm month in Itaboraí: daytime highs average 24.8°C and nights cool to about 17.5°C. By daytime temperature it is the 10th warmest of the 12 months.
Expect about 77 mm of rain on roughly 11 days, which makes May a moderately wet month (the 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 02 min on an average May day.
The nearest other city in this atlas is Maricá (20 km away). In May its highs average 25.2°C, about as warm as Itaboraí, with 77 mm of rain.
Among the 448 cities listed in Brazil, Itaboraí ranks joint 245th of 448 for the warmest May highs and joint 255th of 448 for the driest May (rainfall, lowest first). The mean May high of those 448 cities is 25.3°C; Itaboraí is 0.5°C cooler than that mean.
From May to June, average highs fall by 0.4°C to 24.4°C, and monthly rainfall falls from 77 mm to 44 mm.
The annual picture
May 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, selected | 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 | 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
May in nearby cities
- Maricá in MayBrazil · 20 kmHigh 25.2°C · Low 19.7°C · 77 mm rain
- Magé in MayBrazil · 21 kmHigh 25.1°C · Low 17.7°C · 75 mm rain
- São Gonçalo in MayBrazil · 22 kmHigh 25.0°C · Low 18.3°C · 75 mm rain
- Rio de Janeiro in MayBrazil · 38 kmHigh 25.6°C · Low 19.0°C · 76 mm rain
- Teresópolis in MayBrazil · 38 kmHigh 21.3°C · Low 14.2°C · 80 mm rain
- Petrópolis in MayBrazil · 42 kmHigh 22.0°C · Low 14.8°C · 70 mm rain
- Saquarema in MayBrazil · 43 kmHigh 24.3°C · Low 19.9°C · 76 mm rain
- Duque de Caxias in MayBrazil · 47 kmHigh 25.8°C · Low 18.3°C · 74 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.