Rio Negrinho in Summer
In summer (December, January and February), Rio Negrinho sees average daytime highs around 25°C and overnight lows near 17°C, with 574 mm of rain over about 63 wet days across the season. It is the warmest season of the year and the wettest season of the year.
Across summer, daytime highs hold fairly steady around 25°C. The sky is clear or mostly clear about 9% of the time across summer, and the air most often feels muggy.
Summer is Rio Negrinho's weakest season of the year to visit on our travel score. For the whole year in context, see Rio Negrinho's year-round climate.
- Avg daytime high
- 25°C
- warmest season of the year
- Avg overnight low
- 17°C
- Rainfall
- 574 mm
- 63 wet days
- Avg wind
- 10 km/h
- Travel score
- 4.8
- weakest season of the year
- Months
- Dec · Jan · Feb
Temperature in Rio Negrinho in Summer
Across summer, daytime highs hold fairly steady around 25°C.
A typical summer day in Rio Negrinho reaches about 25°C and drops to 17°C overnight. The warmest of the three months is January, the coolest December.
Rio Negrinho weather by month
How the three summer months (December, January and February) 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 | 26° / 17° | 211 | 22.6 | 13.5 | 4.7 |
| Feb | 26° / 17° | 190 | 20.7 | 12.9 | 4.6 |
| Mar | 25° / 17° | 132 | 18.4 | 12.2 | 5.4 |
| Apr | 23° / 14° | 85 | 11.4 | 11.4 | 6.4 |
| May | 20° / 11° | 102 | 9.7 | 10.7 | 6.2 |
| Jun | 19° / 10° | 125 | 9.8 | 10.4 | 6.0 |
| Jul | 19° / 9° | 103 | 9.1 | 10.5 | 6.2 |
| Aug | 20° / 10° | 101 | 8.3 | 11.1 | 6.6 |
| Sep | 21° / 12° | 176 | 11.6 | 11.8 | 6.0 |
| Oct | 22° / 13° | 169 | 16 | 12.6 | 5.4 |
| Nov | 23° / 15° | 138 | 16.5 | 13.3 | 5.6 |
| Dec | 25° / 16° | 173 | 19.3 | 13.6 | 5.2 |
Cloud cover in Summer
The sky is clear or mostly clear about 9% of the time across summer.
Chance of precipitation in Summer
Rio Negrinho gets around 574 mm of rain over 63 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 10 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 13 h 30 min in early December to 12 h 36 min by late February. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 5.2 kWh/m².
Is summer a good time to visit Rio Negrinho?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is a reasonable time to visit Rio Negrinho for sightseeing.
What to pack for Rio Negrinho in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Rio Negrinho sees daytime highs around 25°C and nights near 17°C. Pack rain gear. Worth having: light clothes and sun protection. About 63 days see rain.
UV index in Rio Negrinho in Summer
Clear-sky midday UV across summer averages around 14 (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 Negrinho peaks around January 18 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 13 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 | 5 | 5 | 6 | 9 | 11 | 12 | 14 |
| Level | Extreme | Extreme | Extreme | Very high | High | High | Moderate | 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 | 5 | High |
| Jul | 5 | Moderate |
| Aug | 6 | High |
| Sep | 9 | Very high |
| Oct | 11 | Extreme |
| Nov | 12 | Extreme |
| Dec | 14 | Extreme |
Air quality in Rio Negrinho in Summer
Average fine-particle pollution (PM2.5) through the year — so you can see where summer falls, not just the annual average.
Air quality in Rio Negrinho 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 Negrinho?
Rio Negrinho sits at 26.3°S, 49.5°W, 793 m above sea level, in Brazil. The nearest listed city is São Bento do Sul, 14 km away.
Topography around Rio Negrinho
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Rio Negrinho.
Within 3 km, the terrain around Rio Negrinho has only modest variations in elevation — a maximum elevation change of 116 m around an average of 820 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 310 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,647 m.
The land around Rio Negrinho is covered by trees (57%) and artificial surfaces (22%) within 3 km, trees (71%) within 16 km, and trees (74%) 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 Negrinho (-26.2544°, -49.5183°, elevation 793 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.