Rio Negro in Fall
In fall (March, April and May), Rio Negro sees average daytime highs around 23°C and overnight lows near 15°C, with 271 mm of rain over about 31 wet days across the season. It is the 2nd-warmest season and the driest season of the year.
Over the season highs ease from about 27°C in early March to 19°C by late May. The sky is clear or mostly clear about 21% of the time across fall, and the air most often feels humid.
Fall is Rio Negro's 2nd-best season to visit on our travel score. For the whole year in context, see Rio Negro's year-round climate.
- Avg daytime high
- 23°C
- 2nd-warmest season
- Avg overnight low
- 15°C
- Rainfall
- 271 mm
- 31 wet days
- Avg wind
- 9 km/h
- Travel score
- 6.5
- 2nd-best season
- Months
- Mar · Apr · May
Temperature in Rio Negro in Fall
Over the season highs ease from about 27°C in early March to 19°C by late May.
A typical fall day in Rio Negro reaches about 23°C and drops to 15°C overnight. The warmest of the three months is March, the coolest May.
Rio Negro weather by month
How the three fall months (March, April and May) 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 Fall
The sky is clear or mostly clear about 21% of the time across fall.
Chance of precipitation in Fall
Rio Negro gets around 271 mm of rain over 31 wet days across fall. The line is the day-by-day chance of measurable precipitation.
Humidity in Fall
Most of fall feels humid — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Fall
Winds average 9 km/h across fall.
Sunrise & sunset in Fall
Daylight runs from about 12 h 36 min in early March to 10 h 30 min by late May. The lit band spans sunrise to sunset each day.
Solar energy in Fall
Average shortwave solar energy reaching the ground each day across fall, about 3.9 kWh/m².
Is fall a good time to visit Rio Negro?
Our two travel scores rate fall for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
fall is a reasonable time to visit Rio Negro for sightseeing.
What to pack for Rio Negro in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Rio Negro sees daytime highs around 23°C and nights near 15°C. Pack rain gear. Worth having: light clothes and sun protection. About 31 days see rain.
UV index in Rio Negro in Fall
Clear-sky midday UV across fall averages around 9 (very high — sun protection essential). 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 Fall
Average fine-particle pollution (PM2.5) through the year — so you can see where fall 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.