São Sebastião do Caí in Spring
In spring (September, October and November), São Sebastião do Caí sees average daytime highs around 24°C and overnight lows near 14°C, with 558 mm of rain over about 40 wet days across the season. It is the 3rd-warmest season and the 2nd-wettest season.
Over the season highs climb from about 22°C in early September to 27°C by late November. The sky is clear or mostly clear about 30% of the time across spring, and the air most often feels dry.
Spring is São Sebastião do Caí's 3rd-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
- 24°C
- 3rd-warmest season
- Avg overnight low
- 14°C
- Rainfall
- 558 mm
- 40 wet days
- Avg wind
- 9 km/h
- Travel score
- 6.1
- 3rd-best season
- Months
- Sep · Oct · Nov
Temperature in São Sebastião do Caí in Spring
Over the season highs climb from about 22°C in early September to 27°C by late November.
A typical spring day in São Sebastião do Caí reaches about 24°C and drops to 14°C overnight. The warmest of the three months is November, the coolest September.
São Sebastião do Caí weather by month
How the three spring months (September, October and November) 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 Spring
The sky is clear or mostly clear about 30% of the time across spring.
Chance of precipitation in Spring
São Sebastião do Caí gets around 558 mm of rain over 40 wet days across spring. The line is the day-by-day chance of measurable precipitation.
Humidity in Spring
Most of spring feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Spring
Winds average 9 km/h across spring.
Sunrise & sunset in Spring
Daylight runs from about 11 h 24 min in early September to 13 h 42 min by late November. The lit band spans sunrise to sunset each day.
Solar energy in Spring
Average shortwave solar energy reaching the ground each day across spring, about 5.0 kWh/m².
Is spring a good time to visit São Sebastião do Caí?
Our two travel scores rate spring for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
spring is a reasonable time to visit São Sebastião do Caí for sightseeing.
What to pack for São Sebastião do Caí in Spring
From spring's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In spring, São Sebastião do Caí sees daytime highs around 24°C and nights near 14°C. Pack rain gear and sun protection. Worth having: light clothes. About 40 days see rain.
UV index in São Sebastião do Caí in Spring
Clear-sky midday UV across spring averages around 9 (very high — sun protection essential). 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 Spring
Average fine-particle pollution (PM2.5) through the year — so you can see where spring 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.