São Sebastião in Spring
In spring (September, October and November), São Sebastião sees average daytime highs around 23°C and overnight lows near 20°C, with 465 mm of rain over about 46 wet days across the season. It is the 3rd-warmest season and the 3rd-wettest season.
Over the season highs climb from about 22°C in early September to 25°C by late November. The sky is clear or mostly clear about 20% of the time across spring, and the air most often feels muggy.
Spring is São Sebastião's 3rd-best season to visit on our travel score. São Sebastião has little temperature swing across the year, so its calendar seasons blur — the season framing matters less here than for a place with four distinct seasons. For the whole year in context, see São Sebastião's year-round climate.
- Avg daytime high
- 23°C
- 3rd-warmest season
- Avg overnight low
- 20°C
- Rainfall
- 465 mm
- 46 wet days
- Avg wind
- 11 km/h
- Travel score
- 5.8
- 3rd-best season
- Months
- Sep · Oct · Nov
Temperature in São Sebastião in Spring
Over the season highs climb from about 22°C in early September to 25°C by late November.
A typical spring day in São Sebastião reaches about 23°C and drops to 20°C overnight. The warmest of the three months is November, the coolest September.
São Sebastião 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 | 27° / 24° | 277 | 22.4 | 13.3 | 4.6 |
| Feb | 27° / 24° | 228 | 19.6 | 12.8 | 4.7 |
| Mar | 27° / 23° | 236 | 20.6 | 12.2 | 5.0 |
| Apr | 25° / 22° | 130 | 13.7 | 11.5 | 6.2 |
| May | 23° / 20° | 115 | 12.1 | 10.9 | 6.6 |
| Jun | 23° / 18° | 82 | 9.5 | 10.6 | 7.0 |
| Jul | 22° / 18° | 92 | 8.8 | 10.7 | 7.0 |
| Aug | 22° / 18° | 75 | 8.9 | 11.2 | 7.0 |
| Sep | 22° / 19° | 132 | 13.7 | 11.9 | 6.1 |
| Oct | 23° / 20° | 147 | 15.2 | 12.6 | 5.8 |
| Nov | 24° / 21° | 187 | 17.5 | 13.1 | 5.6 |
| Dec | 26° / 22° | 214 | 19.2 | 13.4 | 5.1 |
Cloud cover in Spring
The sky is clear or mostly clear about 20% of the time across spring.
Chance of precipitation in Spring
São Sebastião gets around 465 mm of rain over 46 wet days across spring. The line is the day-by-day chance of measurable precipitation.
Humidity in Spring
Most of spring feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Spring
Winds average 11 km/h across spring.
Sunrise & sunset in Spring
Daylight runs from about 11 h 30 min in early September to 13 h 24 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 5.1 kWh/m².
Is spring a good time to visit São Sebastião?
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 for sightseeing.
What to pack for São Sebastião in Spring
From spring's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In spring, São Sebastião sees daytime highs around 23°C and nights near 20°C. Pack rain gear. Worth having: light clothes and sun protection. About 46 days see rain.
Sea temperature near São Sebastião in Spring
The nearest coast averages about 22°C across spring — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 25 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) | 26 | 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 | 26 | 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 São Sebastião in Spring
Clear-sky midday UV across spring averages around 11 (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 peaks around February 8 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 11 at about 5 (high).
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 | 14 | 11 | 9 | 7 | 6 | 5 | 8 | 8 | 11 | 13 | 14 |
| Level | Extreme | Extreme | Extreme | Very high | High | High | High | Very high | Very high | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 14 | Extreme |
| Feb | 14 | Extreme |
| Mar | 11 | Extreme |
| Apr | 9 | Very high |
| May | 7 | High |
| Jun | 6 | High |
| Jul | 5 | High |
| Aug | 8 | Very high |
| Sep | 8 | Very high |
| Oct | 11 | Extreme |
| Nov | 13 | Extreme |
| Dec | 14 | Extreme |
Air quality in São Sebastião 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 is worst in June — around 23 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (November, 13 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) | 13 | 13 | 13 | 14 | 18 | 23 | 23 | 22 | 21 | 16 | 13 | 13 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 13 | Moderate |
| Feb | 13 | Moderate |
| Mar | 13 | Moderate |
| Apr | 14 | Moderate |
| May | 18 | Moderate |
| Jun | 23 | Moderate |
| Jul | 23 | Moderate |
| Aug | 22 | Moderate |
| Sep | 21 | Moderate |
| Oct | 16 | Moderate |
| Nov | 13 | Moderate |
| Dec | 13 | Moderate |
Where is São Sebastião?
São Sebastião sits at 23.8°S, 45.4°W, 6 m above sea level, in Brazil. The nearest listed city is Ilhabela, 6.0 km away.
Topography around São Sebastião
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of São Sebastião.
Within 3 km, the terrain around São Sebastião has large variations in elevation — a maximum elevation change of 806 m around an average of 181 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,359 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,647 m.
The land around São Sebastião is covered by trees (50%) and water (39%) within 3 km, trees (53%) and water (36%) within 16 km, and water (53%) and trees (33%) 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 (-23.76°, -45.4097°, elevation 6 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.