Rio Grande in Summer
In summer (December, January and February), Rio Grande sees average daytime highs around 24°C and overnight lows near 22°C, with 256 mm of rain over about 26 wet days across the season. It is the warmest season of the year and the driest season of the year.
Over the season highs climb from about 22°C in early December to 24°C by late February. The sky is clear or mostly clear about 46% of the time across summer, and the air most often feels muggy.
Summer is Rio Grande's best season of the year to visit on our travel score. For the whole year in context, see Rio Grande's year-round climate.
- Avg daytime high
- 24°C
- warmest season of the year
- Avg overnight low
- 22°C
- Rainfall
- 256 mm
- 26 wet days
- Avg wind
- 23 km/h
- Travel score
- 7.2
- best season of the year
- Months
- Dec · Jan · Feb
Temperature in Rio Grande in Summer
Over the season highs climb from about 22°C in early December to 24°C by late February.
A typical summer day in Rio Grande reaches about 24°C and drops to 22°C overnight. The warmest of the three months is February, the coolest December.
Rio 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 | 24° / 22° | 87 | 8.6 | 13.9 | 7.4 |
| Feb | 24° / 23° | 84 | 9.7 | 13.2 | 7.0 |
| Mar | 24° / 22° | 92 | 10 | 12.2 | 7.1 |
| Apr | 21° / 19° | 113 | 10.2 | 11.2 | 6.6 |
| May | 19° / 16° | 104 | 9.7 | 10.4 | 6.1 |
| Jun | 16° / 14° | 110 | 9.7 | 9.9 | 5.0 |
| Jul | 15° / 12° | 112 | 10.2 | 10.1 | 4.4 |
| Aug | 15° / 13° | 108 | 9.7 | 10.8 | 4.8 |
| Sep | 16° / 14° | 125 | 10.4 | 11.8 | 5.1 |
| Oct | 18° / 17° | 129 | 10.2 | 12.8 | 6.0 |
| Nov | 21° / 19° | 87 | 7.7 | 13.6 | 6.8 |
| Dec | 23° / 21° | 86 | 7.8 | 14.1 | 7.3 |
Cloud cover in Summer
The sky is clear or mostly clear about 46% of the time across summer.
Chance of precipitation in Summer
Rio Grande gets around 256 mm of rain over 26 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 23 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 13 h 54 min 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 6.6 kWh/m².
Is summer a good time to visit Rio 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 one of the better times to visit Rio Grande for general sightseeing.
What to pack for Rio Grande in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Rio Grande sees daytime highs around 24°C and nights near 22°C. Pack sun protection. Worth having: light clothes, rain gear and a windbreaker. About 26 days see rain.
Sea temperature near Rio Grande in Summer
The nearest coast averages about 24°C across summer — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea offshore is warmest in February at about 24°C and coldest in July near 14°C.
It's comfortable for a long swim from Nov 18 to May 4 — about 5.5 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 24 | 24 | 24 | 22 | 19 | 16 | 14 | 14 | 15 | 18 | 20 | 22 |
| Comfort | Refreshing | Warm | Refreshing | Refreshing | Cool | Cool | Bracing | Bracing | Cool | Cool | Cool | Refreshing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 24 | Refreshing |
| Feb | 24 | Warm |
| Mar | 24 | Refreshing |
| Apr | 22 | Refreshing |
| May | 19 | Cool |
| Jun | 16 | Cool |
| Jul | 14 | Bracing |
| Aug | 14 | Bracing |
| Sep | 15 | Cool |
| Oct | 18 | Cool |
| Nov | 20 | Cool |
| Dec | 22 | Refreshing |
UV index in Rio 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 Rio Grande peaks around January 16 at about 12 (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) | 12 | 12 | 9 | 7 | 4 | 3 | 3 | 5 | 7 | 7 | 11 | 12 |
| Level | Extreme | Extreme | Very high | High | Moderate | Moderate | Moderate | Moderate | High | Very high | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 12 | Extreme |
| Feb | 12 | Extreme |
| Mar | 9 | Very high |
| Apr | 7 | High |
| May | 4 | Moderate |
| Jun | 3 | Moderate |
| Jul | 3 | Moderate |
| Aug | 5 | Moderate |
| Sep | 7 | High |
| Oct | 7 | Very high |
| Nov | 11 | Extreme |
| Dec | 12 | Extreme |
Where is Rio Grande?
Rio Grande sits at 32.0°S, 52.1°W, 7 m above sea level, in Brazil. The nearest listed city is São José do Norte, 6.0 km away.
Topography around Rio Grande
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Rio Grande.
Within 3 km, the terrain around Rio Grande has only modest variations in elevation — a maximum elevation change of 11 m around an average of 1 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 33 m; within 80 km, significant variations in elevation — a maximum elevation change of 357 m.
The land around Rio Grande is covered by water (61%) and artificial surfaces (29%) within 3 km, water (52%) and grassland (20%) within 16 km, and water (48%) 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 Grande (-32.035°, -52.0986°, elevation 7 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.