São Caetano do Sul in Summer
In summer (December, January and February), São Caetano do Sul sees average daytime highs around 27°C and overnight lows near 19°C, with 591 mm of rain over about 65 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 11% of the time across summer, and the air most often feels muggy.
Summer is São Caetano do Sul's weakest season of the year to visit on our travel score. For the whole year in context, see São Caetano do Sul's year-round climate.
- Avg daytime high
- 27°C
- warmest season of the year
- Avg overnight low
- 19°C
- Rainfall
- 591 mm
- 65 wet days
- Avg wind
- 10 km/h
- Travel score
- 4.5
- weakest season of the year
- Months
- Dec · Jan · Feb
Temperature in São Caetano do Sul in Summer
Across summer, daytime highs hold fairly steady around 27°C.
A typical summer day in São Caetano do Sul reaches about 27°C and drops to 19°C overnight. The warmest of the three months is February, the coolest December.
São Caetano do Sul 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° / 19° | 232 | 23.8 | 13.3 | 4.3 |
| Feb | 28° / 19° | 179 | 20.2 | 12.8 | 4.5 |
| Mar | 27° / 19° | 154 | 20.1 | 12.2 | 5.0 |
| Apr | 25° / 17° | 64 | 10.7 | 11.5 | 6.6 |
| May | 23° / 14° | 64 | 7.8 | 10.9 | 7.1 |
| Jun | 22° / 13° | 47 | 5.6 | 10.6 | 7.5 |
| Jul | 22° / 12° | 54 | 5.6 | 10.7 | 7.5 |
| Aug | 23° / 13° | 40 | 5.2 | 11.2 | 7.8 |
| Sep | 24° / 15° | 90 | 9.8 | 11.9 | 6.9 |
| Oct | 25° / 16° | 116 | 14.7 | 12.6 | 5.9 |
| Nov | 25° / 17° | 152 | 16.8 | 13.1 | 5.4 |
| Dec | 27° / 18° | 181 | 20.9 | 13.4 | 4.8 |
Cloud cover in Summer
The sky is clear or mostly clear about 11% of the time across summer.
Chance of precipitation in Summer
São Caetano do Sul gets around 591 mm of rain over 65 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 10 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 5.5 kWh/m².
Hazard calendar for São Caetano do Sul
In summer, São Caetano do Sul overlaps its rainy season season. The full year is below, with each hazard's peak months called out.
São Caetano do Sul's rainy season runs October–March, when most of the year's rain falls.
Is summer a good time to visit São Caetano do Sul?
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 São Caetano do Sul for sightseeing.
What to pack for São Caetano do Sul in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, São Caetano do Sul sees daytime highs around 27°C and nights near 19°C. Pack light clothes and rain gear. Worth having: sun protection. About 65 days see rain.
Sea temperature near São Caetano do Sul 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 52 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 São Caetano do Sul 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 São Caetano do Sul 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 São Caetano do Sul 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 São Caetano do Sul is worst in June — around 25 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (December, 11 µg/m³).
Seasonal pattern from CAMS reanalysis, scaled to São Caetano do Sul's WHO annual average of 16.9 µg/m³.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 11 | 12 | 14 | 17 | 22 | 25 | 25 | 21 | 19 | 14 | 11 | 11 |
| Level | Good | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 11 | Good |
| Feb | 12 | Good |
| Mar | 14 | Moderate |
| Apr | 17 | Moderate |
| May | 22 | Moderate |
| Jun | 25 | Moderate |
| Jul | 25 | Moderate |
| Aug | 21 | Moderate |
| Sep | 19 | Moderate |
| Oct | 14 | Moderate |
| Nov | 11 | Good |
| Dec | 11 | Good |
Where is São Caetano do Sul?
São Caetano do Sul sits at 23.6°S, 46.6°W, 770 m above sea level, in Brazil. The nearest listed city is Sao Lucas, 3.0 km away.
Topography around São Caetano do Sul
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of São Caetano do Sul.
Within 3 km, the terrain around São Caetano do Sul has only modest variations in elevation — a maximum elevation change of 83 m around an average of 763 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 271 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,459 m.
The land around São Caetano do Sul is covered by artificial surfaces (94%) within 3 km, artificial surfaces (77%) within 16 km, and trees (54%) 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 Caetano do Sul (-23.6231°, -46.5511°, elevation 770 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.