São Sebastião do Caí in Winter
In winter (June, July and August), São Sebastião do Caí sees average daytime highs around 19°C and overnight lows near 10°C, with 468 mm of rain over about 32 wet days across the season. It is the coldest season of the year and the 3rd-wettest season.
Over the season highs climb from about 19°C in early June to 22°C by late August. The sky is clear or mostly clear about 35% of the time across winter, and the air most often feels dry.
Winter is São Sebastião do Caí's 2nd-best season to visit on our travel score. For the whole year in context, see São Sebastião do Caí's year-round climate.
- Avg daytime high
- 19°C
- coldest season of the year
- Avg overnight low
- 10°C
- Rainfall
- 468 mm
- 32 wet days
- Avg wind
- 9 km/h
- Travel score
- 6.1
- 2nd-best season
- Months
- Jun · Jul · Aug
Temperature in São Sebastião do Caí in Winter
Over the season highs climb from about 19°C in early June to 22°C by late August.
A typical winter day in São Sebastião do Caí reaches about 19°C and drops to 10°C overnight. The warmest of the three months is August, the coolest July.
São Sebastião do Caí weather by month
How the three winter months (June, July and August) 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° / 19° | 209 | 17.6 | 13.7 | 4.7 |
| Feb | 28° / 19° | 180 | 16.6 | 13.1 | 4.8 |
| Mar | 27° / 18° | 154 | 15.2 | 12.2 | 5.8 |
| Apr | 24° / 15° | 142 | 11.2 | 11.3 | 6.6 |
| May | 21° / 12° | 136 | 10.4 | 10.5 | 6.4 |
| Jun | 19° / 10° | 144 | 10.3 | 10.1 | 6.0 |
| Jul | 19° / 9° | 180 | 10.8 | 10.3 | 6.0 |
| Aug | 21° / 11° | 145 | 10.7 | 10.9 | 6.4 |
| Sep | 22° / 12° | 178 | 12.5 | 11.8 | 6.1 |
| Oct | 24° / 14° | 216 | 14.8 | 12.7 | 6.0 |
| Nov | 26° / 16° | 164 | 12.8 | 13.5 | 6.2 |
| Dec | 28° / 18° | 182 | 15.1 | 13.9 | 5.4 |
Cloud cover in Winter
The sky is clear or mostly clear about 35% of the time across winter.
Chance of precipitation in Winter
São Sebastião do Caí gets around 468 mm of rain over 32 wet days across winter. The line is the day-by-day chance of measurable precipitation.
Humidity in Winter
Most of winter feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Winter
Winds average 9 km/h across winter.
Sunrise & sunset in Winter
Daylight runs from about 10 h 12 min in early June to 11 h 18 min by late August. The lit band spans sunrise to sunset each day.
Solar energy in Winter
Average shortwave solar energy reaching the ground each day across winter, about 2.8 kWh/m².
Is winter a good time to visit São Sebastião do Caí?
Our two travel scores rate winter for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
winter is a reasonable time to visit São Sebastião do Caí for sightseeing.
What to pack for São Sebastião do Caí in Winter
From winter's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In winter, São Sebastião do Caí sees daytime highs around 19°C and nights near 10°C. Worth packing: rain gear. About 32 days see rain.
UV index in São Sebastião do Caí in Winter
Clear-sky midday UV across winter averages around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in São Sebastião do Caí peaks around January 16 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 20 at about 4 (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 | 12 | 10 | 8 | 5 | 4 | 4 | 5 | 8 | 8 | 12 | 13 |
| Level | Extreme | Extreme | Very high | Very high | Moderate | Moderate | Moderate | High | Very high | Very high | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 13 | Extreme |
| Feb | 12 | Extreme |
| Mar | 10 | Very high |
| Apr | 8 | Very high |
| May | 5 | Moderate |
| Jun | 4 | Moderate |
| Jul | 4 | Moderate |
| Aug | 5 | High |
| Sep | 8 | Very high |
| Oct | 8 | Very high |
| Nov | 12 | Extreme |
| Dec | 13 | Extreme |
Air quality in São Sebastião do Caí in Winter
Average fine-particle pollution (PM2.5) through the year — so you can see where winter falls, not just the annual average.
Air quality in São Sebastião do Caí is worst in September — around 17 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (December, 10 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) | 10 | 10 | 10 | 12 | 12 | 11 | 13 | 16 | 17 | 12 | 11 | 10 |
| Level | Good | Good | Good | Good | Good | Good | Moderate | Moderate | Moderate | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 10 | Good |
| Feb | 10 | Good |
| Mar | 10 | Good |
| Apr | 12 | Good |
| May | 12 | Good |
| Jun | 11 | Good |
| Jul | 13 | Moderate |
| Aug | 16 | Moderate |
| Sep | 17 | Moderate |
| Oct | 12 | Good |
| Nov | 11 | Good |
| Dec | 10 | Good |
Where is São Sebastião do Caí?
São Sebastião do Caí sits at 29.6°S, 51.4°W, 16 m above sea level, in Brazil. The nearest listed city is Montenegro, 14 km away.
Topography around São Sebastião do Caí
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of São Sebastião do Caí.
Within 3 km, the terrain around São Sebastião do Caí has only modest variations in elevation — a maximum elevation change of 107 m around an average of 32 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 512 m; within 80 km, large variations in elevation — a maximum elevation change of 988 m.
The land around São Sebastião do Caí is covered by trees (69%) within 3 km, trees (73%) within 16 km, and trees (62%) 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 São Sebastião do Caí (-29.5867°, -51.3756°, elevation 16 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.