December 4 is generally a great time to visit Rio de Janeiro. While there is a slight chance of rain (39%), showers are usually brief. Expect comfortable 29°C weather. You'll find plenty of company in Rio de Janeiro this month as tourism activity remains quite robust.
View the full calendar
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 December 4
"Warm & Sunny. Expect average highs of 29.3°C. 39% chance of rain."
What to Wear in Rio de Janeiro in December
Based on historical data for December 4, Rio de Janeiro typically experiences temperatures between 21.9°C and 29.3°C. We recommend packing t-shirt, light clothing, umbrella to stay comfortable. With a 39% chance of rain, keeping a raincoat or umbrella handy is a smart move.
Complete Packing Guide
Weekly breakdown & essential items for Rio de Janeiro
Smart Suitcase
- T-Shirt
- Light Clothing
- Umbrella
Average High
29.3°C
Daytime Peak
Average Low
21.9°C
Nighttime Low
Feels Like
35.6°C
🔥 Heat index effect
Rain Chance
39%
Avg 2.7mm if it rains
Cloud Cover
74%
Light drizzle
Pressure
1011.8 hPa
Low 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 90% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 30 recommended
05:00 - 10:00
16:00 - 18:00
Type I-II
🔴 15 min to burn
Type III-IV
🟡 23 min to burn
Type V-VI
🟢 38 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
25.5°C
Humid/Sticky
Heat Index
35.6°C
Feels hotter
😕 Best outdoor time:
Morning hours (before 11 AM)
Marine Conditions
Marine Life
No special warnings. Enjoy the swim!
Swim Index
✅ Excellent Swimming Conditions
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in Brazil
Flight Traffic
Busy
72/100 pressure index
Health Advisory
Required
2 vaccines • View Details →
Landing Slots
~180
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Rio de Janeiro
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:00
☀️ Noon
11:44
🌇 Sunset
18:28
⏱️ Daylight
13h 27m
Wind Speed
17.4 km/h
Gentle breeze
Sunshine
10.1 hrs
Direct Sun (Cloud-free)
Humidity
80%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Rio de Janeiro
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 Rio de Janeiro
Travel Comfort Index
Real-time tourism conditions
Weather Quality
⛅ Good
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 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 December 4 averages 29.3°C with a 39% precipitation probability. Wedding/Outdoor Event Score: 83/100."
— 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
November 27
29.1°C • 35% rain
Score
87
November 30
29.1°C • 33% rain
Score
87
November 28
29.1°C • 35% rain
Score
86
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (December 4) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Rio de Janeiro Worth Visiting on December 4?
Planning a trip to Rio de Janeiro on December 4? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year typically offers vibrant summer conditions averaging 29.3°C with a 39% historical precipitation risk.
✈️ Travel Logistics: Approximately 180 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 24.6°C (swimming pool). Wave conditions are generally fun waves with heights around 0.82m.
📊 Historical Extremes: The hottest December 4 recorded in the last 30 years saw temperatures hit 33.3°C in 2020, while the coldest dropped to 19.8°C in 2021.