Três Rios in Summer
In summer (December, January and February), Três Rios sees average daytime highs around 29°C and overnight lows near 20°C, with 623 mm of rain over about 56 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 29°C. The sky is clear or mostly clear about 14% of the time across summer, and the air most often feels muggy.
Summer is Três Rios's weakest season of the year to visit on our travel score. For the whole year in context, see Três Rios's year-round climate.
- Avg daytime high
- 29°C
- warmest season of the year
- Avg overnight low
- 20°C
- Rainfall
- 623 mm
- 56 wet days
- Avg wind
- 7 km/h
- Travel score
- 4.2
- weakest season of the year
- Months
- Dec · Jan · Feb
Temperature in Três Rios in Summer
Across summer, daytime highs hold fairly steady around 29°C.
A typical summer day in Três Rios reaches about 29°C and drops to 20°C overnight. The warmest of the three months is February, the coolest December.
Três Rios 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 | 29° / 20° | 233 | 19.5 | 13.2 | 4.1 |
| Feb | 30° / 20° | 154 | 15.1 | 12.8 | 4.3 |
| Mar | 29° / 20° | 148 | 17.7 | 12.2 | 4.5 |
| Apr | 27° / 18° | 57 | 9.6 | 11.5 | 6.4 |
| May | 25° / 16° | 35 | 6.3 | 11 | 7.4 |
| Jun | 24° / 14° | 17 | 3.4 | 10.7 | 8.2 |
| Jul | 24° / 14° | 18 | 3.7 | 10.8 | 8.2 |
| Aug | 25° / 14° | 21 | 4.2 | 11.2 | 7.9 |
| Sep | 26° / 16° | 59 | 8.7 | 11.9 | 6.8 |
| Oct | 27° / 18° | 107 | 13.7 | 12.5 | 5.8 |
| Nov | 27° / 19° | 198 | 18.8 | 13.1 | 4.8 |
| Dec | 29° / 20° | 236 | 21.3 | 13.3 | 4.2 |
Cloud cover in Summer
The sky is clear or mostly clear about 14% of the time across summer.
Chance of precipitation in Summer
Três Rios gets around 623 mm of rain over 56 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 7 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 13 h 18 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 5.7 kWh/m².
Hazard calendar for Três Rios
In summer, Três Rios overlaps its monsoon season. The full year is below, with each hazard's peak months called out.
Três Rios's monsoon runs October–March, when most of the year's rain falls.
Is summer a good time to visit Três Rios?
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 Três Rios for sightseeing.
What to pack for Três Rios in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Três Rios sees daytime highs around 29°C and nights near 20°C. Pack light clothes and rain gear. Worth having: sun protection. About 56 days see rain.
UV index in Três Rios 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 Três Rios peaks around February 9 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 10 at about 6 (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 | 15 | 13 | 10 | 7 | 6 | 6 | 8 | 8 | 12 | 14 | 14 |
| Level | Extreme | Extreme | Extreme | Very high | High | High | High | Very high | Very high | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 15 | Extreme |
| Feb | 15 | Extreme |
| Mar | 13 | Extreme |
| Apr | 10 | Very high |
| May | 7 | High |
| Jun | 6 | High |
| Jul | 6 | High |
| Aug | 8 | Very high |
| Sep | 8 | Very high |
| Oct | 12 | Extreme |
| Nov | 14 | Extreme |
| Dec | 14 | Extreme |
Air quality in Três Rios 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 Três Rios is worst in September — around 22 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (January, 11 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) | 11 | 11 | 12 | 13 | 15 | 15 | 14 | 16 | 22 | 14 | 12 | 11 |
| Level | Good | Good | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 11 | Good |
| Feb | 11 | Good |
| Mar | 12 | Good |
| Apr | 13 | Moderate |
| May | 15 | Moderate |
| Jun | 15 | Moderate |
| Jul | 14 | Moderate |
| Aug | 16 | Moderate |
| Sep | 22 | Moderate |
| Oct | 14 | Moderate |
| Nov | 12 | Good |
| Dec | 11 | Good |
Where is Três Rios?
Três Rios sits at 22.1°S, 43.2°W, 276 m above sea level, in Brazil. The nearest listed city is Paraíba do Sul, 10 km away.
Topography around Três Rios
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Três Rios.
Within 3 km, the terrain around Três Rios has significant variations in elevation — a maximum elevation change of 408 m around an average of 338 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 655 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,252 m.
The land around Três Rios is covered by grassland (52%), trees (24%) and artificial surfaces (22%) within 3 km, grassland (59%) and trees (37%) within 16 km, and trees (49%) and grassland (45%) 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 Três Rios (-22.1167°, -43.2092°, elevation 276 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.