Arroio Grande in Summer
In summer (December, January and February), Arroio Grande sees average daytime highs around 27°C and overnight lows near 19°C, with 315 mm of rain over about 31 wet days across the season. It is the warmest season of the year and the driest season of the year.
Across summer, daytime highs hold fairly steady around 27°C. The sky is clear or mostly clear about 34% of the time across summer, and the air most often feels muggy.
Summer is Arroio Grande's 3rd-best season to visit on our travel score. For the whole year in context, see Arroio Grande's year-round climate.
- Avg daytime high
- 27°C
- warmest season of the year
- Avg overnight low
- 19°C
- Rainfall
- 315 mm
- 31 wet days
- Avg wind
- 14 km/h
- Travel score
- 6.4
- 3rd-best season
- Months
- Dec · Jan · Feb
Temperature in Arroio Grande in Summer
Across summer, daytime highs hold fairly steady around 27°C.
A typical summer day in Arroio Grande reaches about 27°C and drops to 19°C overnight. The warmest of the three months is January, the coolest December.
Arroio Grande 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 | 28° / 20° | 111 | 10.6 | 13.9 | 6.3 |
| Feb | 27° / 20° | 107 | 11.2 | 13.2 | 6.1 |
| Mar | 26° / 19° | 103 | 9.9 | 12.2 | 6.7 |
| Apr | 23° / 16° | 124 | 9.8 | 11.2 | 6.9 |
| May | 20° / 13° | 96 | 9 | 10.4 | 6.4 |
| Jun | 17° / 10° | 110 | 9.3 | 9.9 | 5.5 |
| Jul | 16° / 9° | 107 | 9.3 | 10.1 | 5.3 |
| Aug | 18° / 10° | 107 | 8.9 | 10.8 | 6.0 |
| Sep | 19° / 12° | 124 | 10.2 | 11.8 | 6.0 |
| Oct | 22° / 14° | 133 | 10.4 | 12.8 | 6.4 |
| Nov | 24° / 16° | 98 | 8.2 | 13.7 | 7.2 |
| Dec | 27° / 18° | 96 | 9.5 | 14.1 | 6.8 |
Cloud cover in Summer
The sky is clear or mostly clear about 34% of the time across summer.
Chance of precipitation in Summer
Arroio Grande gets around 315 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 14 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 14 hours in early December to 12 h 48 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 6.4 kWh/m².
Is summer a good time to visit Arroio Grande?
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 Arroio Grande for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Arroio Grande in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Arroio Grande sees daytime highs around 27°C and nights near 19°C. Pack light clothes and sun protection. Worth having: rain gear. About 31 days see rain.
UV index in Arroio Grande in Summer
Clear-sky midday UV across summer averages around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Arroio Grande peaks around January 15 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 18 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) | 13 | 12 | 10 | 6 | 4 | 3 | 3 | 4 | 7 | 7 | 11 | 12 |
| Level | Extreme | Extreme | Very high | High | Moderate | Moderate | Moderate | Moderate | High | High | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 13 | Extreme |
| Feb | 12 | Extreme |
| Mar | 10 | Very high |
| Apr | 6 | High |
| May | 4 | Moderate |
| Jun | 3 | Moderate |
| Jul | 3 | Moderate |
| Aug | 4 | Moderate |
| Sep | 7 | High |
| Oct | 7 | High |
| Nov | 11 | Extreme |
| Dec | 12 | Extreme |
Where is Arroio Grande?
Arroio Grande sits at 32.2°S, 53.1°W, 31 m above sea level, in Brazil. The nearest listed city is Jaguarão, 46 km away.
Topography around Arroio Grande
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Arroio Grande.
Within 3 km, the terrain around Arroio Grande has only modest variations in elevation — a maximum elevation change of 62 m around an average of 33 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 240 m; within 80 km, significant variations in elevation — a maximum elevation change of 480 m.
The land around Arroio Grande is covered by cropland (34%), trees (27%) and grassland (26%) within 3 km, cropland (48%), grassland (25%) and trees (24%) within 16 km, and grassland (35%), cropland (22%) and trees (20%) 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 Arroio Grande (-32.2375°, -53.0869°, elevation 31 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.