São Francisco do Sul in Summer
In summer (December, January and February), São Francisco do Sul sees average daytime highs around 29°C and overnight lows near 21°C, with 727 mm of rain over about 67 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 29°C. The sky is clear or mostly clear about 9% of the time across summer, and the air most often feels oppressive.
Summer is São Francisco do Sul's weakest season of the year to visit on our travel score. For the whole year in context, see São Francisco do Sul's year-round climate.
- Avg daytime high
- 29°C
- warmest season of the year
- Avg overnight low
- 21°C
- Rainfall
- 727 mm
- 67 wet days
- Avg wind
- 7 km/h
- Travel score
- 3.8
- weakest season of the year
- Months
- Dec · Jan · Feb
Temperature in São Francisco do Sul in Summer
Across summer, daytime highs hold fairly steady around 29°C.
A typical summer day in São Francisco do Sul reaches about 29°C and drops to 21°C overnight. The warmest of the three months is January, the coolest December.
How summer really feels in São Francisco do Sul
Once humidity and wind are folded in, summer brings about 16 days that feel above 32°C and 0 that feel at or below 0°C.
The story in summer is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
São Francisco 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 | 29° / 22° | 279 | 24.4 | 13.5 | 3.6 |
| Feb | 29° / 22° | 255 | 21.6 | 12.9 | 3.6 |
| Mar | 28° / 21° | 202 | 22.4 | 12.2 | 4.3 |
| Apr | 26° / 19° | 116 | 14.1 | 11.4 | 5.8 |
| May | 24° / 16° | 107 | 12.2 | 10.7 | 6.5 |
| Jun | 22° / 14° | 104 | 10 | 10.4 | 6.6 |
| Jul | 21° / 13° | 89 | 9.9 | 10.5 | 6.5 |
| Aug | 22° / 14° | 87 | 9.3 | 11.1 | 6.7 |
| Sep | 23° / 16° | 145 | 14.6 | 11.8 | 5.8 |
| Oct | 24° / 18° | 149 | 17.3 | 12.6 | 5.4 |
| Nov | 26° / 19° | 161 | 17.7 | 13.3 | 5.1 |
| Dec | 28° / 21° | 193 | 20.7 | 13.6 | 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
São Francisco do Sul gets around 727 mm of rain over 67 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 7 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 13 h 30 min in early December to 12 h 36 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 5.0 kWh/m².
Is summer a good time to visit São Francisco 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 weaker month for outdoor sightseeing in São Francisco do Sul.
What to pack for São Francisco do Sul in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, São Francisco do Sul sees daytime highs around 29°C and nights near 21°C. Pack light clothes and rain gear. Worth having: sun protection. About 67 days see rain.
Sea temperature near São Francisco 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 15 km away) is warmest in February at about 27°C and coldest in August near 18°C.
It's comfortable for a long swim from Sep 26 to Jun 19 — about 8.8 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 27 | 27 | 26 | 25 | 22 | 20 | 19 | 18 | 20 | 21 | 23 | 25 |
| Comfort | Warm | Warm | Warm | Warm | Refreshing | Refreshing | Cool | Cool | Cool | Refreshing | Refreshing | Warm |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 27 | Warm |
| Feb | 27 | Warm |
| Mar | 26 | Warm |
| Apr | 25 | Warm |
| May | 22 | Refreshing |
| Jun | 20 | Refreshing |
| Jul | 19 | Cool |
| Aug | 18 | Cool |
| Sep | 20 | Cool |
| Oct | 21 | Refreshing |
| Nov | 23 | Refreshing |
| Dec | 25 | Warm |
UV index in São Francisco do Sul in Summer
Clear-sky midday UV across summer averages around 13 (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 Francisco do Sul peaks around January 18 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 12 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 | 13 | 11 | 8 | 6 | 5 | 5 | 6 | 9 | 10 | 12 | 13 |
| Level | Extreme | Extreme | Extreme | Very high | High | High | Moderate | High | Very high | Very high | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 14 | Extreme |
| Feb | 13 | Extreme |
| Mar | 11 | Extreme |
| Apr | 8 | Very high |
| May | 6 | High |
| Jun | 5 | High |
| Jul | 5 | Moderate |
| Aug | 6 | High |
| Sep | 9 | Very high |
| Oct | 10 | Very high |
| Nov | 12 | Extreme |
| Dec | 13 | Extreme |
Air quality in São Francisco 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 Francisco do Sul is worst in August — around 15 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (February, 9 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) | 9 | 9 | 9 | 10 | 12 | 14 | 15 | 15 | 14 | 12 | 9 | 9 |
| Level | Good | Good | Good | Good | Good | Moderate | Moderate | Moderate | Moderate | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 9 | Good |
| Feb | 9 | Good |
| Mar | 9 | Good |
| Apr | 10 | Good |
| May | 12 | Good |
| Jun | 14 | Moderate |
| Jul | 15 | Moderate |
| Aug | 15 | Moderate |
| Sep | 14 | Moderate |
| Oct | 12 | Good |
| Nov | 9 | Good |
| Dec | 9 | Good |
Where is São Francisco do Sul?
São Francisco do Sul sits at 26.2°S, 48.6°W, 16 m above sea level, in Brazil. The nearest listed city is Itapoá, 14 km away.
Topography around São Francisco do Sul
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of São Francisco do Sul.
Within 3 km, the terrain around São Francisco do Sul has only modest variations in elevation — a maximum elevation change of 146 m around an average of 9 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 580 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,647 m.
The land around São Francisco do Sul is covered by water (53%) and trees (26%) within 3 km, trees (51%) and water (36%) within 16 km, and trees (55%) and water (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 Francisco do Sul (-26.2433°, -48.6381°, 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.