December 20 is generally a great time to visit Hiroshima. While there is a slight chance of rain (15%), showers are usually brief. Expect comfortable 10°C weather. As it's peak season for Hiroshima, we recommend booking your stay well in advance to secure the best rates.
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Essential Travel Info for Hiroshima
Currency
JPY
¥ Japanese yen
Language
Japanese
Driving
Left side
Connect
Public wireless LAN is available at publ...
Safety
Very High Safety
GPI: 1.336
Hiroshima Weather Forecast for December 20
"Mild & Comfortable. Expect average highs of 9.6°C. 15% chance of snow."
What to Wear in Hiroshima in December
Based on historical data for December 20, Hiroshima typically experiences temperatures between 2.4°C and 9.6°C. We recommend packing heavy coat, scarf, gloves to stay comfortable. Trends suggest it will stay mostly dry (15% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Hiroshima
Smart Suitcase
- Heavy Coat
- Scarf
- Gloves
Average High
9.6°C
Daytime Peak
Average Low
2.4°C
Nighttime Low
Feels Like
7.6°C
❄️ Minor difference
Snow Chance
15%
Avg 1mm if it snows
Snowfall
0.2 cm
~15% chance
Pressure
1022.3 hPa
Medium volatility
Hiroshima Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 100% 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°C
Dry air
Heat Stress
Low
No heat warning
😐 Best outdoor time:
Midday (11 AM - 3 PM) when warmest
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
93/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~27
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Hiroshima
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
07:13
☀️ Noon
12:08
🌇 Sunset
17:04
⏱️ Daylight
9h 51m
Wind Speed
13.8 km/h
Gentle breeze
Sunshine
6.7 hrs
Direct Sun (Cloud-free)
Humidity
73%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Hiroshima
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 Hiroshima
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
Moderate seismic activity. Occasional tremors possible.
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, Hiroshima on December 20 averages 9.6°C with a 15% precipitation probability. Wedding/Outdoor Event Score: 67/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Hiroshima Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
December 14
10.9°C • 14% rain
Score
79
December 13
11.2°C • 16% rain
Score
75
December 17
9.8°C • 14% rain
Score
73
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (December 20) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Hiroshima Worth Visiting on December 20?
Planning a trip to Hiroshima on December 20? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year offers a bracing seasonal atmosphere averaging 9.6°C with a 15% historical precipitation risk.
✈️ Travel Logistics: Approximately 27 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 14.7°C (polar plunge). Wave conditions are generally lake-like with heights around 0.24m.
📊 Historical Extremes: The hottest December 20 recorded in the last 30 years saw temperatures hit 14.3°C in 2016, while the coldest dropped to -2.3°C in 2017.