Rio Brilhante in Summer
In summer (December, January and February), Rio Brilhante sees average daytime highs around 32°C and overnight lows near 22°C, with 478 mm of rain over about 55 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 32°C. The sky is clear or mostly clear about 22% of the time across summer, and the air most often feels oppressive.
Summer is Rio Brilhante's weakest season of the year to visit on our travel score. For the whole year in context, see Rio Brilhante's year-round climate.
- Avg daytime high
- 32°C
- warmest season of the year
- Avg overnight low
- 22°C
- Rainfall
- 478 mm
- 55 wet days
- Avg wind
- 7 km/h
- Travel score
- 3.3
- weakest season of the year
- Months
- Dec · Jan · Feb
Temperature in Rio Brilhante in Summer
Across summer, daytime highs hold fairly steady around 32°C.
A typical summer day in Rio Brilhante reaches about 32°C and drops to 22°C overnight. The warmest of the three months is December, the coolest December.
How summer really feels in Rio Brilhante
Once humidity and wind are folded in, summer brings about 90 days that feel above 32°C and 0 that feel at or below 0°C.
The story in summer is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Rio Brilhante 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 | 32° / 23° | 182 | 19.7 | 13.2 | 3.2 |
| Feb | 32° / 22° | 142 | 17.2 | 12.7 | 3.3 |
| Mar | 32° / 22° | 114 | 14.9 | 12.2 | 3.7 |
| Apr | 30° / 20° | 68 | 8.6 | 11.5 | 5.1 |
| May | 27° / 17° | 76 | 7.7 | 11 | 6.9 |
| Jun | 26° / 16° | 51 | 5.7 | 10.7 | 7.5 |
| Jul | 27° / 15° | 37 | 4.7 | 10.8 | 7.7 |
| Aug | 29° / 17° | 42 | 4.7 | 11.3 | 6.3 |
| Sep | 31° / 19° | 82 | 7.7 | 11.9 | 4.9 |
| Oct | 32° / 21° | 120 | 13 | 12.5 | 3.9 |
| Nov | 32° / 21° | 137 | 13.8 | 13 | 3.7 |
| Dec | 32° / 22° | 154 | 17.6 | 13.3 | 3.3 |
Cloud cover in Summer
The sky is clear or mostly clear about 22% of the time across summer.
Chance of precipitation in Summer
Rio Brilhante gets around 478 mm of rain over 55 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 7 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 13 h 12 min in early December to 12 h 30 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 6.0 kWh/m².
Hazard calendar for Rio Brilhante
In summer, Rio Brilhante overlaps its rainy season season. The full year is below, with each hazard's peak months called out.
Rio Brilhante's rainy season runs October–March, when most of the year's rain falls.
Is summer a good time to visit Rio Brilhante?
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 weaker month for outdoor sightseeing in Rio Brilhante.
What to pack for Rio Brilhante in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Rio Brilhante sees daytime highs around 32°C and nights near 22°C. Pack light clothes, rain gear and sun protection. About 55 days see rain.
UV index in Rio Brilhante 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 Brilhante peaks around January 19 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near September 14 at about 3 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 16 | 14 | 13 | 10 | 7 | 6 | 6 | 8 | 3 | 12 | 12 | 13 |
| Level | Extreme | Extreme | Extreme | Very high | Very high | High | High | Very high | Moderate | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 16 | Extreme |
| Feb | 14 | Extreme |
| Mar | 13 | Extreme |
| Apr | 10 | Very high |
| May | 7 | Very high |
| Jun | 6 | High |
| Jul | 6 | High |
| Aug | 8 | Very high |
| Sep | 3 | Moderate |
| Oct | 12 | Extreme |
| Nov | 12 | Extreme |
| Dec | 13 | Extreme |
Air quality in Rio Brilhante 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 Brilhante is worst in September — around 25 µg/m³ PM2.5 (moderate), about 4.6× the cleanest month (April, 5 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) | 8 | 7 | 6 | 5 | 6 | 6 | 6 | 14 | 25 | 14 | 8 | 7 |
| Level | Good | Good | Good | Good | Good | Good | Good | Moderate | Moderate | Moderate | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 8 | Good |
| Feb | 7 | Good |
| Mar | 6 | Good |
| Apr | 5 | Good |
| May | 6 | Good |
| Jun | 6 | Good |
| Jul | 6 | Good |
| Aug | 14 | Moderate |
| Sep | 25 | Moderate |
| Oct | 14 | Moderate |
| Nov | 8 | Good |
| Dec | 7 | Good |
Where is Rio Brilhante?
Rio Brilhante sits at 21.8°S, 54.5°W, 319 m above sea level, in Brazil. The nearest listed city is Itaporã, 40 km away.
Topography around Rio Brilhante
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Rio Brilhante.
Within 3 km, the terrain around Rio Brilhante has only modest variations in elevation — a maximum elevation change of 39 m around an average of 312 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 126 m; within 80 km, significant variations in elevation — a maximum elevation change of 312 m.
The land around Rio Brilhante is covered by cropland (38%), trees (25%) and artificial surfaces (20%) within 3 km, cropland (60%) and trees (21%) within 16 km, and cropland (64%) 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 Brilhante (-21.8019°, -54.5464°, elevation 319 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.