September 30 is generally a great time to visit Rio de Janeiro. While there is a slight chance of rain (23%), showers are usually brief. Expect comfortable 27°C weather. It's a lively time to explore Rio de Janeiro, with most attractions operating at full capacity.
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Essential Travel Info for Rio de Janeiro
Currency
BRL
R$ Brazilian real
Language
Portuguese
Driving
Right side
Safety
Moderate Safety
GPI: 2.465
Rio de Janeiro Weather Forecast for September 30
"Warm & Sunny. Expect average highs of 27.4°C. 23% chance of rain."
What to Wear in Rio de Janeiro in September
Based on historical data for September 30, Rio de Janeiro typically experiences temperatures between 19.4°C and 27.4°C. We recommend packing t-shirt, light clothing to stay comfortable. Trends suggest it will stay mostly dry (23% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Rio de Janeiro
Smart Suitcase
- T-Shirt
- Light Clothing
Average High
27.4°C
Daytime Peak
Average Low
19.4°C
Nighttime Low
Feels Like
30.3°C
🔥 Feels warmer
Rain Chance
23%
Avg 1.5mm if it rains
Cloud Cover
66%
Light drizzle
Pressure
1016.3 hPa
Medium volatility
Rio de Janeiro Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 86% 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
🔴 27 min to burn
Type III-IV
🟡 41 min to burn
Type V-VI
🟢 68 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
23°C
Humid/Sticky
Heat Index
30.3°C
Feels hotter
😐 Best outdoor time:
Morning hours (before 11 AM)
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
67/100 pressure index
Health Advisory
Required
2 vaccines • View Details →
Landing Slots
~168
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Rio de Janeiro
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:35
☀️ Noon
11:43
🌇 Sunset
17:52
⏱️ Daylight
12h 16m
Wind Speed
17.8 km/h
Gentle breeze
Sunshine
8.8 hrs
Direct Sun (Cloud-free)
Humidity
77%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Rio de Janeiro
Smart Flight Estimator
Airport-to-Airport Logistics
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Travel Health & Safety in Rio de Janeiro
Travel Comfort Index
Real-time tourism conditions
Weather Quality
☀️ Excellent
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 acceptable. Sensitive individuals should limit prolonged outdoor exertion.
Regional Safety Profile
Seismic Activity
Zero seismic activity detected in 30 years.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Rio de Janeiro on September 30 averages 27.4°C with a 23% precipitation probability. Wedding/Outdoor Event Score: 94/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Rio de Janeiro Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
September 24
26.9°C • 23% rain
Score
96
September 23
27.1°C • 25% rain
Score
95
September 25
27°C • 25% rain
Score
95
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (September 30) in other destinations
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📍 Is Rio de Janeiro Worth Visiting on September 30?
Planning a trip to Rio de Janeiro on September 30? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year typically offers vibrant summer conditions averaging 27.4°C with a 23% historical precipitation risk.
✈️ Travel Logistics: Approximately 168 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 23.3°C (swimming pool). Wave conditions are generally fun waves with heights around 1.02m.
📊 Historical Extremes: The hottest September 30 recorded in the last 30 years saw temperatures hit 32.3°C in 2024, while the coldest dropped to 16.8°C in 2025.