Florianópolis weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Poor
Best time to visit: December – April
What is the weather like in Florianópolis in September?
In September, Florianópolis is warm: daytime highs average 21 °C, and nights cool down to about 16 °C. The sea averages 18.9 °C – bracing, so a wetsuit helps for longer swims. Expect around 5 hours of sunshine a day. Rain is frequent, with about 13 rainy days and 147 mm in total. All in all, September is not an ideal month for a holiday in Florianópolis.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 30 | 31 | 40 |
| Day | 20° | 21° | 23° |
| Night | 14° | 16° | 18° |
| Sea | 18° | 19° | 21° |
| Sun | 5 h | 5 h | 4 h |
| Rain days | 10 | 13 | 16 |
More details for September
- Daylight
- 11 h 54 min06:13 – 18:06
- UV index
- 8 · very highclear sky, noon (estimate)
- Muggy days
- 5 daysdew point 18 °C or more
- Wind
- 13 km/haverage daily peak
- Cloud cover
- 74 %on average
- Hot days
- 0 days30 °C or more
- Time zone
- UTC−3America/Sao_Paulo
How the score comes together
- Temperatureweight 35 %37 %
- Seaweight 25 %27 %
- Sunshineweight 20 %25 %
- Few rainy daysweight 20 %34 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in September
- Wetsuit for longer swims
- Sunscreen
- Sunglasses & sun hat
- Rain jacket or umbrella
Florianópolis in September: quick answers
Is Florianópolis hot in September?
Warm rather than hot: in September, daytime highs in Florianópolis average 21 °C and nights cool to about 16 °C.
Can you swim in Florianópolis in September?
Only if you don't mind cold water: in September the sea averages just 18.9 °C. Comfortable swimming is possible from October to May.
Does it rain much in Florianópolis in September?
Rain is frequent, with about 13 rainy days and 147 mm in total.
Florianópolis month by month
The whole year in FlorianópolisAll destinations: Brazil
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, GeoNames (CC BY 4.0)