July 21 is generally a great time to visit Hiroshima. While there is a slight chance of rain (30%), showers are usually brief. Expect comfortable 30°C weather. Expect a bustling atmosphere in Hiroshima right now—this is when the city truly comes alive with visitors. Note: July 21 is Marine Day in Hiroshima, so expect special events, closures, and festive atmosphere.
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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 July 21
"Warm & Sunny. Expect average highs of 29.8°C. 30% chance of rain."
What to Wear in Hiroshima in July
Based on historical data for July 21, Hiroshima typically experiences temperatures between 23.3°C and 29.8°C. We recommend packing t-shirt, light clothing to stay comfortable. With a 30% chance of rain, keeping a raincoat or umbrella handy is a smart move.
Complete Packing Guide
Weekly breakdown & essential items for Hiroshima
Smart Suitcase
- T-Shirt
- Light Clothing
Average High
29.8°C
Daytime Peak
Average Low
23.3°C
Nighttime Low
Feels Like
38.2°C
🔥 Heat index effect
Rain Chance
30%
Avg 3.3mm if it rains
Cloud Cover
67%
Overcast
Pressure
1010 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 96% 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 - 19:00
Type I-II
🔴 16 min to burn
Type III-IV
🟡 24 min to burn
Type V-VI
🟢 40 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
26.8°C
Humid/Sticky
Heat Index
38.2°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
Holiday
Marine Day
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
05:13
☀️ Noon
12:17
🌇 Sunset
19:21
⏱️ Daylight
14h 8m
Wind Speed
10.8 km/h
Light breeze
Sunshine
10.5 hrs
Direct Sun (Cloud-free)
Humidity
84%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Hiroshima
Smart Flight Estimator
Airport-to-Airport Logistics
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Travel Health & Safety in Hiroshima
Travel Comfort Index
Real-time tourism conditions
Weather Quality
⛅ Good
Tourist Crowds
🔴 Very Busy
Price Level
💰💰💰 Expensive
Health & Wellbeing
Meteo-Health Forecast
Moderate fluctuations. Some sensitivity possible.
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
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 July 21 averages 29.8°C with a 30% precipitation probability. Wedding/Outdoor Event Score: 87/100."
— 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
July 24
30.3°C • 26% rain
Score
89
July 25
30.5°C • 27% rain
Score
89
July 28
30.8°C • 25% rain
Score
89
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (July 21) in other destinations
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📍 Is Hiroshima Worth Visiting on July 21?
Planning a trip to Hiroshima on July 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 29.8°C with a 30% historical precipitation risk.
🎉 Local Event: The date coincides with Marine Day, which may influence local business hours and event availability.
✈️ 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 27.4°C (tropical bath). Wave conditions are generally lake-like with heights around 0.19m.
📊 Historical Extremes: The hottest July 21 recorded in the last 30 years saw temperatures hit 31.7°C in 2018, while the coldest dropped to 20°C in 2023.