September 21 is statistically one of the best days of the year in Fortaleza. With minimal rain risk (0%) and pleasant highs of 30°C, it's ideal for outdoor adventures. Fortaleza is seeing high visitor numbers, so iconic spots may be busier than usual.
View the full calendar
Essential Travel Info for Fortaleza
Currency
BRL
R$ Brazilian real
Language
Portuguese
Driving
Right side
Safety
Moderate Safety
GPI: 2.465
Fortaleza Weather Forecast for September 21
"Warm & Sunny. Expect average highs of 30.3°C. 0% chance of rain."
What to Wear in Fortaleza in September
Based on historical data for September 21, Fortaleza typically experiences temperatures between 24.7°C and 30.3°C. We recommend packing t-shirt, light clothing to stay comfortable. Trends suggest it will stay mostly dry (0% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Fortaleza
Smart Suitcase
- T-Shirt
- Light Clothing
Average High
30.3°C
Daytime Peak
Average Low
24.7°C
Nighttime Low
Feels Like
36°C
🔥 Heat index effect
Rain Chance
0%
Avg 0.1mm if it rains
Cloud Cover
28%
Light drizzle
Pressure
1012.9 hPa
Low volatility
Fortaleza Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 92% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 30 recommended
05:00 - 09:30
16:00 - 17:00
Type I-II
🔴 17 min to burn
Type III-IV
🟡 26 min to burn
Type V-VI
🟢 43 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
24.4°C
Humid/Sticky
Heat Index
36°C
Feels hotter
😕 Best outdoor time:
Early morning (6-9 AM) or evening (after 6 PM)
Marine Conditions
Jellyfish Warning
High water temps may attract jellyfish swarms.
Swim Index
⚠️ Mixed Conditions
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in Brazil
Flight Traffic
Busy
74/100 pressure index
Health Advisory
Required
2 vaccines • View Details →
Landing Slots
~51
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Fortaleza
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:25
☀️ Noon
11:28
🌇 Sunset
17:31
⏱️ Daylight
12h 6m
Wind Speed
27.5 km/h
Moderate wind
Sunshine
11.0 hrs
Direct Sun (Cloud-free)
Humidity
71%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Fortaleza
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 Fortaleza
Travel Comfort Index
Real-time tourism conditions
Weather Quality
☀️ Excellent
Tourist Crowds
🟡 Busy
Price Level
💰💰💰 Expensive
Health & Wellbeing
Meteo-Health Forecast
Stable conditions. Low risk of headaches.
Mild discomfort possible for arthritic conditions.
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, Fortaleza on September 21 averages 30.3°C with a 0% precipitation probability. Wedding/Outdoor Event Score: 93/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Fortaleza Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Compare Other Cities
Same date (September 21) in other destinations
Prague
Czech Republic
Paris
France
Rome
Italy
London
United Kingdom
Amsterdam
Netherlands
🌍 Explore the same date in different destinations around the world
📍 Is Fortaleza Worth Visiting on September 21?
Planning a trip to Fortaleza on September 21? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year typically offers vibrant summer conditions averaging 30.3°C with a 0% historical precipitation risk.
✈️ Travel Logistics: Approximately 51 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 27.5°C (tropical bath). Wave conditions are generally surfers only with heights around 1.63m.
📊 Historical Extremes: The hottest September 21 recorded in the last 30 years saw temperatures hit 31.9°C in 2023, while the coldest dropped to 24.2°C in 2018.