Rio Negro in Winter
In winter (June, July and August), Rio Negro sees average daytime highs around 20°C and overnight lows near 10°C, with 276 mm of rain over about 25 wet days across the season. It is the coldest season of the year and the 3rd-wettest season.
Over the season highs climb from about 19°C in early June to 22°C by late August. The sky is clear or mostly clear about 37% of the time across winter, and the air most often feels dry.
Winter is Rio Negro's best season of the year to visit on our travel score. For the whole year in context, see Rio Negro's year-round climate.
- Avg daytime high
- 20°C
- coldest season of the year
- Avg overnight low
- 10°C
- Rainfall
- 276 mm
- 25 wet days
- Avg wind
- 10 km/h
- Travel score
- 6.6
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in Rio Negro in Winter
Over the season highs climb from about 19°C in early June to 22°C by late August.
A typical winter day in Rio Negro reaches about 20°C and drops to 10°C overnight. The warmest of the three months is August, the coolest July.
Rio Negro weather by month
How the three winter months (June, July and August) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 27° / 18° | 183 | 19.9 | 13.5 | 4.9 |
| Feb | 27° / 18° | 157 | 17.8 | 12.9 | 5.0 |
| Mar | 26° / 17° | 106 | 14.2 | 12.2 | 5.9 |
| Apr | 24° / 15° | 71 | 8.8 | 11.4 | 6.9 |
| May | 21° / 12° | 94 | 8 | 10.7 | 6.6 |
| Jun | 19° / 10° | 106 | 9.2 | 10.4 | 6.3 |
| Jul | 19° / 9° | 86 | 8 | 10.5 | 6.5 |
| Aug | 21° / 10° | 84 | 7.8 | 11.1 | 7.0 |
| Sep | 22° / 12° | 145 | 10.8 | 11.8 | 6.4 |
| Oct | 23° / 14° | 144 | 14.2 | 12.6 | 6.0 |
| Nov | 25° / 15° | 123 | 13.9 | 13.3 | 6.0 |
| Dec | 26° / 17° | 149 | 17 | 13.6 | 5.4 |
Cloud cover in Winter
The sky is clear or mostly clear about 37% of the time across winter.
Chance of precipitation in Winter
Rio Negro gets around 276 mm of rain over 25 wet days across winter. The line is the day-by-day chance of measurable precipitation.
Humidity in Winter
Most of winter feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Winter
Winds average 10 km/h across winter.
Sunrise & sunset in Winter
Daylight runs from about 10 h 30 min in early June to 11 h 24 min by late August. The lit band spans sunrise to sunset each day.
Solar energy in Winter
Average shortwave solar energy reaching the ground each day across winter, about 3.2 kWh/m².
Is winter a good time to visit Rio Negro?
Our two travel scores rate winter for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
winter is a reasonable time to visit Rio Negro for sightseeing.
What to pack for Rio Negro in Winter
From winter's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In winter, Rio Negro sees daytime highs around 20°C and nights near 10°C. Worth packing: rain gear. About 25 days see rain.
UV index in Rio Negro in Winter
Clear-sky midday UV across winter averages around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Rio Negro peaks around January 19 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 12 at about 5 (high).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 15 | 14 | 12 | 9 | 6 | 6 | 5 | 7 | 8 | 11 | 13 | 14 |
| Level | Extreme | Extreme | Extreme | Very high | High | High | High | High | Very high | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 15 | Extreme |
| Feb | 14 | Extreme |
| Mar | 12 | Extreme |
| Apr | 9 | Very high |
| May | 6 | High |
| Jun | 6 | High |
| Jul | 5 | High |
| Aug | 7 | High |
| Sep | 8 | Very high |
| Oct | 11 | Extreme |
| Nov | 13 | Extreme |
| Dec | 14 | Extreme |
Air quality in Rio Negro in Winter
Average fine-particle pollution (PM2.5) through the year — so you can see where winter falls, not just the annual average.
Air quality in Rio Negro is worst in September — around 16 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (February, 9 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 9 | 9 | 9 | 11 | 12 | 12 | 14 | 15 | 16 | 11 | 10 | 9 |
| Level | Good | Good | Good | Good | Moderate | Good | Moderate | Moderate | Moderate | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 9 | Good |
| Feb | 9 | Good |
| Mar | 9 | Good |
| Apr | 11 | Good |
| May | 12 | Moderate |
| Jun | 12 | Good |
| Jul | 14 | Moderate |
| Aug | 15 | Moderate |
| Sep | 16 | Moderate |
| Oct | 11 | Good |
| Nov | 10 | Good |
| Dec | 9 | Good |
Where is Rio Negro?
Rio Negro sits at 26.1°S, 49.8°W, 795 m above sea level, in Brazil. The nearest listed city is Mafra, 1.0 km away.
Topography around Rio Negro
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Rio Negro.
Within 3 km, the terrain around Rio Negro has only modest variations in elevation — a maximum elevation change of 110 m around an average of 800 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 196 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,275 m.
The land around Rio Negro is covered by trees (43%) and artificial surfaces (38%) within 3 km, trees (58%) and cropland (30%) within 16 km, and trees (68%) and cropland (23%) within 80 km.
Brazil travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type C / N
- 127 / 220 V · 60 Hz
- Prices
- ≈ 46% of US
- price level, 2025
- GDP per capita
- $10,713
- 2025
- Happiness
- 6.6 / 10
- World Happiness, 2025
- Safe drinking water
- 89%
- of population, 2024
- Homicide rate
- 19.3
- per 100k, 2023
- Road deaths
- 16
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- Low
- EF EPI 482
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Rio Negro (-26.1058°, -49.7975°, elevation 795 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.