September 23 is generally a great time to visit Hiroshima. While there is a slight chance of rain (27%), showers are usually brief. Expect comfortable 26°C weather. Expect a bustling atmosphere in Hiroshima right now—this is when the city truly comes alive with visitors. Note: September 23 is Autumnal Equinox 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 September 23
"Warm & Sunny. Expect average highs of 26.1°C. 27% chance of rain."
What to Wear in Hiroshima in September
Based on historical data for September 23, Hiroshima typically experiences temperatures between 18.7°C and 26.1°C. We recommend packing t-shirt, light clothing to stay comfortable. With a 27% 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
26.1°C
Daytime Peak
Average Low
18.7°C
Nighttime Low
Feels Like
27.2°C
☀️ Minor difference
Rain Chance
27%
Avg 3.1mm if it rains
Cloud Cover
64%
Overcast
Pressure
1014.3 hPa
Low 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
Type I-II
🔴 30 min to burn
Type III-IV
🟡 45 min to burn
Type V-VI
🟢 75 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
21.7°C
Humid/Sticky
Heat Stress
Low
No heat warning
😐 Best outdoor time:
Morning hours (before 11 AM)
Marine Conditions
Jellyfish Warning
High water temps may attract jellyfish swarms.
Swim Index
✅ Excellent Swimming Conditions
Travel & Logistics Insights
Local Calendar
Holiday
Autumnal Equinox Day
Flight Traffic
High
90/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~26
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Hiroshima
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:59
☀️ Noon
12:04
🌇 Sunset
18:08
⏱️ Daylight
12h 8m
Wind Speed
11.2 km/h
Light breeze
Sunshine
8.2 hrs
Direct Sun (Cloud-free)
Humidity
77%
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
🟡 Busy
Price Level
💰💰💰 Expensive
Health & Wellbeing
Meteo-Health Forecast
Stable conditions. Low risk of headaches.
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
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 September 23 averages 26.1°C with a 27% precipitation probability. Wedding/Outdoor Event Score: 95/100."
— 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
September 27
26°C • 22% rain
Score
97
September 26
26.1°C • 24% rain
Score
96
September 28
25.9°C • 23% rain
Score
96
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (September 23) in other destinations
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📍 Is Hiroshima Worth Visiting on September 23?
Planning a trip to Hiroshima on September 23? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year typically offers vibrant summer conditions averaging 26.1°C with a 27% historical precipitation risk.
🎉 Local Event: The date coincides with Autumnal Equinox Day, which may influence local business hours and event availability.
✈️ Travel Logistics: Approximately 26 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 27.5°C (tropical bath). Wave conditions are generally lake-like with heights around 0.27m.
📊 Historical Extremes: The hottest September 23 recorded in the last 30 years saw temperatures hit 28°C in 2020, while the coldest dropped to 16.4°C in 2017.