7-day weather forecast for Niteroi
7-day weather forecast for Niteroi: 22°C, Partly cloudy, Humidity 75%, Wind 16 km/h.
Niteroi sits at 22.9° south latitude, in the tropics, 11 m above sea level, in the America/Sao_Paulo time zone. Over the week ahead highs range from 23° to 28° and lows from 19° to 20°, averaging 22°.
Forecast rainfall totals 35 mm, and 4 of the seven days carry a chance above 50%. Today the sun rises at 05:18 and sets at 17:57: 12:39 of daylight.
| Conditions | high | low | rain | Wind | UV index | |
|---|---|---|---|---|---|---|
| Today | Thunderstorm | 24° | 20° | 100% | 21 km/h | 4 |
| Tomorrow | Heavy drizzle | 26° | 20° | 79% | 16 km/h | 7 |
| Mon, Oct 19 | Heavy drizzle | 23° | 19° | 85% | 13 km/h | 2 |
| Tue, Oct 20 | Light drizzle | 23° | 19° | 51% | 14 km/h | 2 |
| Wed, Oct 21 | Light drizzle | 24° | 19° | 35% | 16 km/h | 8 |
| Thu, Oct 22 | Light drizzle | 24° | 20° | 47% | 11 km/h | 4 |
| Fri, Oct 23 | Overcast | 28° | 19° | 47% | 8 km/h | 8 |
Weather data by Open-Meteo (ECMWF, GFS, ICON models and national weather services). Updated every 15 minutes.
Weather in Niteroi month by month
The table gathers the 2016-2025 climate normals for Niteroi: average highs and lows, total rainfall and number of rainy days for each month of the year.
Niteroi has an annual mean temperature of 24°. The warmest month is January, when highs sit around 31.1°; the coldest is July, with average lows of 16.7°. The 14.4° gap between those two ends of the calendar is the measure of how much the year swings here.
Rainfall totals about 1,143 mm a year, spread over roughly 151 rainy days. The wettest month is January, averaging 155.2 mm across 16 days; the driest is July, with 38.6 mm.
| Month | Average high | Average low | Rainfall | Rainy days |
|---|---|---|---|---|
| January | 31.1° | 23.5° | 155.2 mm | 16 |
| February | 31° | 23.4° | 136.8 mm | 15 |
| March | 30.2° | 22.9° | 133.3 mm | 15 |
| April | 28° | 21° | 85.9 mm | 13 |
| May | 26.2° | 18.9° | 60.1 mm | 10 |
| June | 25.4° | 17.5° | 38.9 mm | 9 |
| July | 25° | 16.7° | 38.6 mm | 7 |
| August | 25.4° | 16.9° | 64.8 mm | 10 |
| September | 27.4° | 18.7° | 56.1 mm | 8 |
| October | 27.6° | 20.1° | 92 mm | 16 |
| November | 27.6° | 20.4° | 139.6 mm | 16 |
| December | 29.7° | 22.1° | 141.8 mm | 16 |
When to visit Niteroi
For travellers who plan around the weather, April–October tend to be the most comfortable stretch: average highs between 25° and 28° and rainfall below the yearly average.
What to expect each month
- In January, highs sit near 31.1° and lows near 23.5°, with about 155.2 mm of rain over 16 days.
- In February, highs sit near 31° and lows near 23.4°, with about 136.8 mm of rain over 15 days.
- In March, highs sit near 30.2° and lows near 22.9°, with about 133.3 mm of rain over 15 days.
- In April, highs sit near 28° and lows near 21°, with about 85.9 mm of rain over 13 days.
- In May, highs sit near 26.2° and lows near 18.9°, with about 60.1 mm of rain over 10 days.
- In June, highs sit near 25.4° and lows near 17.5°, with about 38.9 mm of rain over 9 days.
- In July, highs sit near 25° and lows near 16.7°, with about 38.6 mm of rain over 7 days.
- In August, highs sit near 25.4° and lows near 16.9°, with about 64.8 mm of rain over 10 days.
- In September, highs sit near 27.4° and lows near 18.7°, with about 56.1 mm of rain over 8 days.
- In October, highs sit near 27.6° and lows near 20.1°, with about 92 mm of rain over 16 days.
- In November, highs sit near 27.6° and lows near 20.4°, with about 139.6 mm of rain over 16 days.
- In December, highs sit near 29.7° and lows near 22.1°, with about 141.8 mm of rain over 16 days.
Recorded extremes
Across 2016-2025, the thermometer reached 42.4° at the top of the series and fell to 11.2° at the bottom. These are observed values, not averages: they show what the city has actually faced.
Normals computed from the ERA5 reanalysis (Copernicus/ECMWF), 2016-2025 series.
FAQ
What is the temperature in Niteroi right now?
It is 22°C in Niteroi right now, with partly cloudy. It feels like 23°C.
Will it rain in Niteroi today?
The peak chance of rain today is 100%, with about 24.2 mm expected.
What will the weather be tomorrow in Niteroi?
Tomorrow the high is 26° and the low 20°, with heavy drizzle.
Where does the data come from and how often is it updated?
Data comes from the ECMWF, GFS and ICON models and national weather services via Open-Meteo, updated every 15 minutes.
What is the warmest month in Niteroi?
The warmest month is January, with average highs of 31.1° and lows of 23.5°.
Does it rain a lot in Niteroi?
The city gets about 1,143 mm a year over 151 rainy days. The wettest month is January, with 155.2 mm.
When is the best time to visit Niteroi?
On weather grounds, April–October combine the most agreeable temperatures with below-average rainfall.