Rio Grande da Serra in Summer
In summer (December, January and February), Rio Grande da Serra sees average daytime highs around 27°C and overnight lows near 20°C, with 863 mm of rain over about 74 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 27°C. The sky is clear or mostly clear about 9% of the time across summer, and the air most often feels muggy.
Summer is Rio Grande da Serra's weakest season of the year to visit on our travel score. For the whole year in context, see Rio Grande da Serra's year-round climate.
- Avg daytime high
- 27°C
- warmest season of the year
- Avg overnight low
- 20°C
- Rainfall
- 863 mm
- 74 wet days
- Avg wind
- 8 km/h
- Travel score
- 4.1
- weakest season of the year
- Months
- Dec · Jan · Feb
Temperature in Rio Grande da Serra in Summer
Across summer, daytime highs hold fairly steady around 27°C.
A typical summer day in Rio Grande da Serra reaches about 27°C and drops to 20°C overnight. The warmest of the three months is February, the coolest December.
Rio Grande da Serra 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 | 27° / 20° | 337 | 26.6 | 13.3 | 3.9 |
| Feb | 28° / 20° | 275 | 23 | 12.8 | 4.0 |
| Mar | 27° / 19° | 271 | 24.6 | 12.2 | 4.3 |
| Apr | 25° / 18° | 114 | 15.8 | 11.5 | 5.7 |
| May | 23° / 15° | 96 | 12.1 | 10.9 | 6.4 |
| Jun | 22° / 14° | 70 | 8.4 | 10.6 | 7.0 |
| Jul | 22° / 13° | 84 | 8.3 | 10.7 | 7.1 |
| Aug | 23° / 14° | 68 | 8.8 | 11.2 | 7.1 |
| Sep | 24° / 15° | 129 | 13.9 | 11.9 | 6.2 |
| Oct | 25° / 17° | 157 | 17.8 | 12.6 | 5.4 |
| Nov | 25° / 18° | 209 | 20.7 | 13.1 | 4.9 |
| Dec | 27° / 19° | 251 | 23.9 | 13.4 | 4.3 |
Cloud cover in Summer
The sky is clear or mostly clear about 9% of the time across summer.
Chance of precipitation in Summer
Rio Grande da Serra gets around 863 mm of rain over 74 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 8 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 13 h 24 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 5.6 kWh/m².
Hazard calendar for Rio Grande da Serra
In summer, Rio Grande da Serra overlaps its rainy season season. The full year is below, with each hazard's peak months called out.
Rio Grande da Serra's rainy season runs October–March, when most of the year's rain falls.
Is summer a good time to visit Rio Grande da Serra?
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 Rio Grande da Serra for sightseeing.
What to pack for Rio Grande da Serra in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Rio Grande da Serra sees daytime highs around 27°C and nights near 20°C. Pack light clothes and rain gear. Worth having: sun protection. About 74 days see rain.
Sea temperature near Rio Grande da Serra in Summer
The nearest coast averages about 26°C across summer — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 31 km away) is warmest in February at about 27°C and coldest in August near 21°C.
The water stays above 20°C all year — warm enough for a swim any month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 27 | 27 | 27 | 26 | 24 | 22 | 21 | 21 | 21 | 22 | 23 | 25 |
| Comfort | Warm | Warm | Warm | Warm | Refreshing | Refreshing | Refreshing | Refreshing | Refreshing | Refreshing | Refreshing | Warm |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 27 | Warm |
| Feb | 27 | Warm |
| Mar | 27 | Warm |
| Apr | 26 | Warm |
| May | 24 | Refreshing |
| Jun | 22 | Refreshing |
| Jul | 21 | Refreshing |
| Aug | 21 | Refreshing |
| Sep | 21 | Refreshing |
| Oct | 22 | Refreshing |
| Nov | 23 | Refreshing |
| Dec | 25 | Warm |
UV index in Rio Grande da Serra 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 Grande da Serra peaks around February 8 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 14 at about 5 (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) | 14 | 15 | 10 | 9 | 7 | 6 | 5 | 7 | 8 | 11 | 12 | 14 |
| Level | Extreme | Extreme | Extreme | Very high | High | High | Moderate | Very high | Very high | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 14 | Extreme |
| Feb | 15 | Extreme |
| Mar | 10 | Extreme |
| Apr | 9 | Very high |
| May | 7 | High |
| Jun | 6 | High |
| Jul | 5 | Moderate |
| Aug | 7 | Very high |
| Sep | 8 | Very high |
| Oct | 11 | Extreme |
| Nov | 12 | Extreme |
| Dec | 14 | Extreme |
Air quality in Rio Grande da Serra 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 Grande da Serra is worst in July — around 52 µg/m³ PM2.5 (poor), about 2.1× the cleanest month (February, 24 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) | 25 | 24 | 26 | 28 | 36 | 49 | 52 | 47 | 41 | 31 | 25 | 26 |
| Level | Moderate | Moderate | Moderate | Moderate | Poor | Poor | Poor | Poor | Poor | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 25 | Moderate |
| Feb | 24 | Moderate |
| Mar | 26 | Moderate |
| Apr | 28 | Moderate |
| May | 36 | Poor |
| Jun | 49 | Poor |
| Jul | 52 | Poor |
| Aug | 47 | Poor |
| Sep | 41 | Poor |
| Oct | 31 | Moderate |
| Nov | 25 | Moderate |
| Dec | 26 | Moderate |
Where is Rio Grande da Serra?
Rio Grande da Serra sits at 23.7°S, 46.4°W, 777 m above sea level, in Brazil. The nearest listed city is Ribeirão Pires, 4.0 km away.
Topography around Rio Grande da Serra
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Rio Grande da Serra.
Within 3 km, the terrain around Rio Grande da Serra has only modest variations in elevation — a maximum elevation change of 124 m around an average of 780 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,172 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,434 m.
The land around Rio Grande da Serra is covered by trees (73%) within 3 km, trees (68%) within 16 km, and trees (47%) and water (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 Rio Grande da Serra (-23.7442°, -46.3983°, elevation 777 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.