September 4 is generally a great time to visit Florianópolis. While there is a slight chance of rain (30%), showers are usually brief. Expect comfortable 21°C weather. It's a lively time to explore Florianópolis, with most attractions operating at full capacity.
View the full calendar
Essential Travel Info for Florianópolis
Currency
BRL
R$ Brazilian real
Language
Portuguese
Driving
Right side
Safety
Moderate Safety
GPI: 2.465
Florianópolis Weather Forecast for September 4
"Mild & Comfortable. Expect average highs of 20.9°C. 30% chance of rain."
What to Wear in Florianópolis in September
Based on historical data for September 4, Florianópolis typically experiences temperatures between 15.3°C and 20.9°C. We recommend packing t-shirt, light clothing, umbrella to stay comfortable. With a 30% chance of rain, keeping a raincoat or umbrella handy is a smart move.
Complete Packing Guide
Weekly breakdown & essential items for Florianópolis
Smart Suitcase
- T-Shirt
- Light Clothing
- Umbrella
Average High
20.9°C
Daytime Peak
Average Low
15.3°C
Nighttime Low
Feels Like
21.1°C
☀️ Feels accurate
Rain Chance
30%
Avg 2.4mm if it rains
Cloud Cover
69%
Overcast
Pressure
1019.4 hPa
Medium volatility
Florianópolis Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
✓ Weather is generally predictable, but pack for minor variations. A light backup layer is recommended.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 15 for extended outdoor time
Type I-II
🔴 29 min to burn
Type III-IV
🟡 44 min to burn
Type V-VI
🟢 73 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
17.5°C
Noticeable
Heat Stress
Low
No heat warning
🙂 Best outdoor time:
Any time during daylight hours
Marine Conditions
Marine Life
No special warnings. Enjoy the swim!
Swim Index
⚠️ Mixed Conditions
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in Brazil
Flight Traffic
Busy
69/100 pressure index
Health Advisory
Required
2 vaccines • View Details →
Landing Slots
~54
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Florianópolis
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:26
☀️ Noon
12:14
🌇 Sunset
18:03
⏱️ Daylight
11h 37m
Wind Speed
13.7 km/h
Gentle breeze
Sunshine
7.1 hrs
Direct Sun (Cloud-free)
Humidity
81%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Florianópolis
Smart Flight Estimator
Airport-to-Airport Logistics
unlock smart flight estimates
Add your home location in settings to see airport details.
Travel Health & Safety in Florianópolis
Travel Comfort Index
Real-time tourism conditions
Weather Quality
⛅ Good
Tourist Crowds
🟡 Busy
Price Level
💰💰💰 Expensive
Health & Wellbeing
Meteo-Health Forecast
Moderate fluctuations. Some sensitivity possible.
Weather unlikely to affect joint pain.
Moderate fish activity expected.
Air quality is excellent. Perfect for outdoor activities.
Regional Safety Profile
Seismic Activity
Zero seismic activity detected in 30 years.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Florianópolis on September 4 averages 20.9°C with a 30% precipitation probability. Wedding/Outdoor Event Score: 94/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Florianópolis Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
August 28
20.5°C • 20% rain
Score
99
August 29
20.7°C • 22% rain
Score
98
August 30
21°C • 24% rain
Score
97
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (September 4) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Florianópolis Worth Visiting on September 4?
Planning a trip to Florianópolis on September 4? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year is characterized by pleasant mild weather averaging 20.9°C with a 30% historical precipitation risk.
✈️ Travel Logistics: Approximately 54 landing slots available daily during this period, indicating manageable crowd levels.
💉 Health Advisory: 9 vaccinations are recommended for Brazil, including COVID-19.
🌊 Coastal Conditions: Water temperature averages 19°C (refreshing tonic). Wave conditions are generally fun waves with heights around 0.88m.
📊 Historical Extremes: The hottest September 4 recorded in the last 30 years saw temperatures hit 27.3°C in 2023, while the coldest dropped to 7.9°C in 2022.