Florianópolis in September
In September, Florianópolis averages 22°C (72°F) during the day and 17°C (62°F) at night, with frequent rain — about 19 days of the month see precipitation (115 mm total).
ShoulderConditions are comfortable for sightseeing without being sweltering. Expect daily rain or showers, often in heavy bursts.
September offers comfortable temperatures in Florianópolis, with some rain to plan around.
How September compares to the rest of the year in Florianópolis
September is in the middle of the year for warmth in Florianópolis (9th of 12) and moderately rainy compared to the rest of the year (9th of 12). Daytime temperature runs 2°C below the annual average (24°C). September runs 1°C warmer than August (21°C) and warms a further 1°C into October (23°C).
September sunrise & sunset in Florianópolis
Times shown for Florianópolis local time (America/Sao_Paulo), calculated for the 15th of September. They shift by a few minutes day to day across the month.
Photography light in Florianópolis — September
Golden-hour and blue-hour windows for the 15th of September, in Florianópolis's local time. Use these for soft warm light (golden) or cool architectural twilight (blue).
📅 When to book — Florianópolis in September
Travel writers usually only tell you when to go. Here's when to book flights and lodging for the best mix of price and availability, based on September's tier (Shoulder) and Florianópolis's popularity.
Crowds & pricing — September in Florianópolis
Florianópolis is in a shoulder season month — fewer crowds, slightly lower prices, and a calmer atmosphere than peak weeks. Most major sights stay open with normal hours, though a handful of seasonal restaurants or boat trips may run reduced schedules. Many regulars consider these months the best time to visit because you trade a small amount of weather reliability for a much more pleasant on-the-ground experience.
Why this tier: comfortable tourism weather
Sun & mosquito risk — September in Florianópolis
UV is a clear-sky sea-level estimate — clouds, altitude, and reflective surfaces (snow, water) shift it ±30%. Mosquito risk is climate-derived only; for current disease advisories (dengue, malaria, zika) check the CDC or WHO travel pages before your trip.
Sea temperature in Florianópolis — September
Across the year Florianópolis's sea swings from 17.5°C (July) to 27.4°C (February) — September sits at 20.4°C.
Florianópolis in other months
| Month | Avg high | Avg low | Rainfall | Rain days | Snow days |
|---|---|---|---|---|---|
| January | 29°C / 84°F | 23°C / 73°F | 173 mm | 26 | — |
| February | 28°C / 83°F | 22°C / 72°F | 182 mm | 22 | — |
| March | 27°C / 81°F | 22°C / 71°F | 137 mm | 27 | — |
| April | 25°C / 77°F | 19°C / 67°F | 79 mm | 21 | — |
| May | 22°C / 72°F | 17°C / 62°F | 125 mm | 19 | — |
| June | 21°C / 69°F | 14°C / 58°F | 116 mm | 14 | — |
| July | 20°C / 69°F | 14°C / 57°F | 65 mm | 13 | — |
| August | 21°C / 70°F | 15°C / 58°F | 88 mm | 14 | — |
| September | 22°C / 72°F | 17°C / 62°F | 115 mm | 19 | — |
| October | 23°C / 74°F | 18°C / 64°F | 156 mm | 24 | — |
| November | 25°C / 76°F | 19°C / 66°F | 137 mm | 23 | — |
| December | 27°C / 81°F | 21°C / 70°F | 159 mm | 23 | — |
Other cities with similar September weather
🌍 See the full ranked list of climate twins for Florianópolis in September →
Frequently asked questions
How hot is Florianópolis in September?
In September, Florianópolis averages a high of 22°C (72°F) and a low of 17°C (62°F) — generally mild and pleasant.
Does it rain a lot in Florianópolis in September?
September is quite rainy in Florianópolis, with about 19 rainy days on average.
Is September a good time to visit Florianópolis?
September is mild and pleasant but on the rainy side. It suits travelers who are comfortable with mild and pleasant weather; check the month-by-month ranking to compare it against the rest of the year.
What should I pack for Florianópolis in September?
Pack light layers for warm days and cooler evenings, plus a compact umbrella or rain jacket. See the full September packing list for Florianópolis for a complete, climate-based checklist.
Check the live 10-day forecast and sunrise/sunset.