Climate averages 1991–2020
Florianópolis weather
in September.
A mild, wet month: the 9th warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Florianópolis: daytime highs average 21.0°C and nights cool to about 15.8°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 132 mm of rain on roughly 12 days, which makes September a wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 54 min on an average September day.
The nearest other city in this atlas is São José (Santa Catarina, 27.62°S 48.63°W), Brazil (8 km away). In September its highs average 21.4°C, about as warm as Florianópolis, with 149 mm of rain.
Among the 448 cities listed in Brazil, Florianópolis ranks joint 424th of 448 for the warmest September highs and joint 383rd of 448 for the driest September (rainfall, lowest first). The mean September high of those 448 cities is 27.5°C; Florianópolis is 6.5°C cooler than that mean.
From September to October, average highs rise by 1.7°C to 22.7°C, and monthly rainfall falls from 132 mm to 122 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Florianópolis climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 27.3°C22.3°C | 22.3°C | 181 | 18.9 | 13.714 h |
| February | 27.4°C22.5°C | 22.5°C | 161 | 17.3 | 13.113 h |
| March | 26.5°C21.6°C | 21.6°C | 125 | 17.2 | 12.312 h |
| April | 24.9°C19.6°C | 19.6°C | 84 | 10.4 | 11.511 h |
| May | 22.0°C16.7°C | 16.7°C | 110 | 10.2 | 10.811 h |
| June | 20.3°C14.7°C | 14.7°C | 94 | 8.9 | 10.410 h |
| July | 19.4°C13.5°C | 13.5°C | 84 | 9.0 | 10.611 h |
| August | 20.2°C14.3°C | 14.3°C | 86 | 8.8 | 11.111 h |
| September, selected | 21.0°C15.8°C | 15.8°C | 132 | 12.4 | 11.912 h |
| October | 22.7°C17.7°C | 17.7°C | 122 | 13.7 | 12.713 h |
| November | 24.3°C19.1°C | 19.1°C | 116 | 14.0 | 13.513 h |
| December | 26.4°C21.1°C | 21.1°C | 126 | 15.0 | 13.814 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- São José (Santa Catarina, 27.62°S 48.63°W), Brazil in SeptemberBrazil · 8 kmHigh 21.4°C · Low 15.3°C · 149 mm rain
- Palhoça in SeptemberBrazil · 13 kmHigh 21.6°C · Low 15.1°C · 147 mm rain
- Itapema in SeptemberBrazil · 57 kmHigh 22.0°C · Low 15.6°C · 137 mm rain
- Camboriú in SeptemberBrazil · 64 kmHigh 21.4°C · Low 16.0°C · 152 mm rain
- Brusque in SeptemberBrazil · 66 kmHigh 22.3°C · Low 14.9°C · 158 mm rain
- Balneário Camboriú in SeptemberBrazil · 68 kmHigh 21.0°C · Low 16.0°C · 152 mm rain
- Itajaí in SeptemberBrazil · 77 kmHigh 20.7°C · Low 16.2°C · 152 mm rain
- Gaspar in SeptemberBrazil · 84 kmHigh 22.1°C · Low 15.2°C · 158 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Florianópolis) is explained once on the Florianópolis year overview and on the Sources, method and limits page.