Niterói climate — normals and trends
Niterói (Brazil) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 23.6 °C and it receives 1,109 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is February (26.5 °C on average) and the coldest is July (21.0 °C). Rainfall peaks in January.
Niterói averages 0 frost days, 52 hot days (≥ 30 °C) and 148 rainy days per year.
Niterói has warmed by +1.4 °C between 1940 and 2025, or +0.17 °C per decade. This trend is statistically significant.
The hottest day of the period reached 37.1 °C (on 9 September 1997) and the coldest 13.4 °C (on 27 June 1994).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
NiteróiRio de Janeiro
- coords
- -22.88°, -43.10°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
23.6°C
Average daily high
26.4°C
Average daily low
21.4°C
Annual rainfall
1,109mm
Sunshine / day
9.8h
Mean relative humidity
81%
Average peak wind
17.2km/h
Seasonal range
5.5°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
52 d/yr
Rainy days (≥ 1 mm)
148 d/yr
Annual snowfall
0.0 cm
Average feels-like high
29.6 °C
Average feels-like low
23.7 °C
Average peak gust
30.0 km/h
Tropical nights (≥ 20 °C)
255 d/yr
Solar radiation
17.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.4 °C
since 1940
+0.2 °C per decade · r² = 0.54 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
37.1 °C
9 September 1997
Coldest day
13.4 °C
27 June 1994
Wettest day
200 mm
27 March 1994
Windiest day
42.1 km/h
19 May 2022
Strongest gust
80.6 km/h
6 November 1976
Hottest feels-like
43.5 °C
10 February 1998
Coldest feels-like
9.5 °C
31 May 1979
Sunniest day
13.4 h
26 December 2025
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 29.7 °C | +0.8 °C | 85 mm | -62 mm |
| Feb | 31.5 °C | +2.2 °C | 8 mm | -101 mm |
| Mar | 29.5 °C | +1.1 °C | 51 mm | -78 mm |
| Apr | 26.9 °C | 0.0 °C | 163 mm | +66 mm |
| May | 26.1 °C | +0.9 °C | 26 mm | -41 mm |
| Jun | 25.1 °C | +0.7 °C | 34 mm | -14 mm |
| Jul | 23.2 °C | -0.8 °C | 40 mm | -6 mm |
| Aug | 24.3 °C | -0.3 °C | 15 mm | -29 mm |
| Sep | 25.4 °C | +0.4 °C | 32 mm | -36 mm |
| Oct | 25.5 °C | -0.2 °C | 89 mm | +0 mm |
| Nov | 26.4 °C | +0.1 °C | 60 mm | -61 mm |
| Dec | 29.8 °C | +2.2 °C | 67 mm | -77 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Niterói?
Niterói has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 23.6 °C and it receives 1,109 mm of precipitation per year.
What is the hottest day ever recorded in Niterói?
The hottest day measured in Niterói between 1940 and 2025 was 9 September 1997, reaching 37.1 °C.
What is the coldest day in Niterói?
The coldest day measured in Niterói between 1940 and 2025 was 27 June 1994, at 13.4 °C.
Does it snow in Niterói?
Almost never: Niterói sees virtually no snow, with about 0 frost days per year.
Has the climate of Niterói warmed?
Yes: Niterói warmed by +1.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Niterói?
The wettest day measured in Niterói between 1940 and 2025 was 27 March 1994, with 200 mm of rain in 24 hours.
What was the windiest day in Niterói?
The windiest day measured in Niterói between 1940 and 2025 was 19 May 2022, with winds reaching 42.1 km/h.
What is the warmest month in Niterói?
The warmest month in Niterói is February (26.5 °C on average); the coldest is July (21.0 °C).
How much does it rain in Niterói?
Niterói receives on average 1,109 mm of precipitation per year, spread over about 148 rainy days.
Is it sunny in Niterói?
Niterói gets on average 9.8 hours of sunshine per day, roughly 3,577 hours per year over 1940-2025.
Are there tropical nights in Niterói?
Yes: Niterói has on average 255 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Niterói?
In Niterói, between 1940 and 2025, the highest apparent temperature reached 43.5 °C on 10 February 1998, and the lowest was 9.5 °C on 31 May 1979.
Compare Niterói with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Niterói