Rosário do Sul in Summer
In summer (December, January and February), Rosário do Sul sees average daytime highs around 30°C and overnight lows near 19°C, with 395 mm of rain over about 31 wet days across the season. It is the warmest season of the year and the 2nd-wettest season.
Across summer, daytime highs hold fairly steady around 30°C. The sky is clear or mostly clear about 43% of the time across summer, and the air most often feels muggy.
Summer is Rosário do Sul's weakest season of the year to visit on our travel score. For the whole year in context, see Rosário do Sul's year-round climate.
- Avg daytime high
- 30°C
- warmest season of the year
- Avg overnight low
- 19°C
- Rainfall
- 395 mm
- 31 wet days
- Avg wind
- 13 km/h
- Travel score
- 4.8
- weakest season of the year
- Months
- Dec · Jan · Feb
Temperature in Rosário do Sul in Summer
Across summer, daytime highs hold fairly steady around 30°C.
A typical summer day in Rosário do Sul reaches about 30°C and drops to 19°C overnight. The warmest of the three months is January, the coolest December.
How summer really feels in Rosário do Sul
Once humidity and wind are folded in, summer brings about 13 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.
Rosário do Sul 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 | 31° / 20° | 134 | 11.5 | 13.7 | 4.5 |
| Feb | 30° / 20° | 129 | 10.3 | 13.1 | 4.9 |
| Mar | 29° / 18° | 122 | 9 | 12.2 | 5.9 |
| Apr | 25° / 15° | 151 | 9.3 | 11.3 | 7.0 |
| May | 21° / 12° | 114 | 8.7 | 10.5 | 6.7 |
| Jun | 19° / 10° | 130 | 9.4 | 10.1 | 6.1 |
| Jul | 18° / 9° | 129 | 9.4 | 10.2 | 6.2 |
| Aug | 21° / 10° | 116 | 8.6 | 10.9 | 6.8 |
| Sep | 22° / 12° | 155 | 9.9 | 11.8 | 6.7 |
| Oct | 25° / 14° | 189 | 11 | 12.7 | 6.7 |
| Nov | 28° / 16° | 129 | 8.5 | 13.5 | 6.5 |
| Dec | 30° / 19° | 132 | 9.2 | 13.9 | 5.1 |
Cloud cover in Summer
The sky is clear or mostly clear about 43% of the time across summer.
Chance of precipitation in Summer
Rosário do Sul gets around 395 mm of rain over 31 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 13 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 13 h 48 min in early December to 12 h 42 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 6.5 kWh/m².
Is summer a good time to visit Rosário do Sul?
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 Rosário do Sul for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Rosário do Sul in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Rosário do Sul sees daytime highs around 30°C and nights near 19°C. Pack light clothes and sun protection. Worth having: rain gear. About 31 days see rain.
UV index in Rosário do Sul in Summer
Clear-sky midday UV across summer averages around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Rosário do Sul peaks around January 18 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 19 at about 3 (moderate).
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) | 13 | 13 | 10 | 7 | 4 | 3 | 4 | 5 | 7 | 7 | 11 | 12 |
| Level | Extreme | Extreme | Very high | Very high | Moderate | Moderate | Moderate | Moderate | Very high | Very high | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 13 | Extreme |
| Feb | 13 | Extreme |
| Mar | 10 | Very high |
| Apr | 7 | Very high |
| May | 4 | Moderate |
| Jun | 3 | Moderate |
| Jul | 4 | Moderate |
| Aug | 5 | Moderate |
| Sep | 7 | Very high |
| Oct | 7 | Very high |
| Nov | 11 | Extreme |
| Dec | 12 | Extreme |
Where is Rosário do Sul?
Rosário do Sul sits at 30.3°S, 54.9°W, 123 m above sea level, in Brazil. The nearest listed city is São Gabriel, 58 km away.
Topography around Rosário do Sul
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Rosário do Sul.
Within 3 km, the terrain around Rosário do Sul has only modest variations in elevation — a maximum elevation change of 76 m around an average of 102 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 119 m; within 80 km, significant variations in elevation — a maximum elevation change of 306 m.
The land around Rosário do Sul is covered by trees (35%), grassland (25%) and artificial surfaces (20%) within 3 km, grassland (43%) and cropland (38%) within 16 km, and grassland (55%) and cropland (31%) 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 Rosário do Sul (-30.2583°, -54.9142°, elevation 123 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.