December 21 is statistically one of the best days of the year in Osaka. With minimal rain risk (11%) and pleasant highs of 10°C, it's ideal for outdoor adventures. As it's peak season for Osaka, we recommend booking your stay well in advance to secure the best rates.
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Essential Travel Info for Osaka
Currency
JPY
¥ Japanese yen
Language
Japanese
Driving
Left side
Safety
Very High Safety
GPI: 1.336
Osaka Weather Forecast for December 21
"Mild & Comfortable. Expect average highs of 10°C. 11% chance of rain."
What to Wear in Osaka in December
Based on historical data for December 21, Osaka typically experiences temperatures between 2.4°C and 10°C. We recommend packing heavy coat, scarf, gloves to stay comfortable. Trends suggest it will stay mostly dry (11% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Osaka
Smart Suitcase
- Heavy Coat
- Scarf
- Gloves
Average High
10°C
Daytime Peak
Average Low
2.4°C
Nighttime Low
Feels Like
7.8°C
❄️ Slightly colder
Rain Chance
11%
Avg 0.7mm if it rains
Cloud Cover
50%
Overcast
Pressure
1020.7 hPa
Medium volatility
Osaka Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 95% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 15 for extended outdoor time
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
5.8°C
Dry air
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
❄️ Cold Water Hazard
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in Japan
Flight Traffic
High
91/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~254
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Osaka
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
07:02
☀️ Noon
11:57
🌇 Sunset
16:51
⏱️ Daylight
9h 49m
Wind Speed
16.1 km/h
Gentle breeze
Sunshine
7.1 hrs
Direct Sun (Cloud-free)
Humidity
75%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Osaka
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 Osaka
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.
High pressure may reduce activity.
Air quality is acceptable. Sensitive individuals should limit prolonged outdoor exertion.
Regional Safety Profile
Seismic Activity
Active seismic zone. Multiple earthquakes per year.
Typhoon Risk
Year-round risk present
Travel Alert: This region has elevated natural risks. We recommend registering with your embassy and keeping emergency numbers handy.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Osaka on December 21 averages 10°C with a 11% precipitation probability. Wedding/Outdoor Event Score: 73/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Osaka Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
December 16
10.5°C • 14% rain
Score
76
December 17
10.5°C • 14% rain
Score
76
December 18
10.2°C • 14% rain
Score
75
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (December 21) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Osaka Worth Visiting on December 21?
Planning a trip to Osaka on December 21? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year offers a bracing seasonal atmosphere averaging 10°C with a 11% historical precipitation risk.
✈️ Travel Logistics: Approximately 254 landing slots available daily during this period, indicating manageable crowd levels.
💉 Health Advisory: 8 vaccinations are recommended for Japan, including COVID-19.
🌊 Coastal Conditions: Water temperature averages 10.9°C (polar plunge). Wave conditions are generally lake-like with heights around 0.49m.
📊 Historical Extremes: The hottest December 21 recorded in the last 30 years saw temperatures hit 15.6°C in 2016, while the coldest dropped to -0.8°C in 2022.