August 21 is generally a great time to visit Naha. While there is a slight chance of rain (32%), showers are usually brief. Expect comfortable 30°C weather. Naha is currently in its most popular travel window, meaning vibrant crowds and premium pricing.
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Essential Travel Info for Naha
Currency
JPY
¥ Japanese yen
Language
Japanese
Driving
Left side
Safety
Very High Safety
GPI: 1.336
Naha Weather Forecast for August 21
"Warm & Sunny. Expect average highs of 29.8°C. 32% chance of rain."
What to Wear in Naha in August
Based on historical data for August 21, Naha typically experiences temperatures between 27°C and 29.8°C. We recommend packing t-shirt, light clothing, umbrella to stay comfortable. With a 32% chance of rain, keeping a raincoat or umbrella handy is a smart move.
Complete Packing Guide
Weekly breakdown & essential items for Naha
Smart Suitcase
- T-Shirt
- Light Clothing
- Umbrella
Average High
29.8°C
Daytime Peak
Average Low
27°C
Nighttime Low
Feels Like
37.6°C
🔥 Heat index effect
Rain Chance
32%
Avg 1.9mm if it rains
Cloud Cover
56%
Light drizzle
Pressure
1008.9 hPa
Low volatility
Naha Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 86% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 30 recommended
06:00 - 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
26.4°C
Humid/Sticky
Heat Index
37.6°C
Feels hotter
😕 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
Business Day
Standard hours in Japan
Flight Traffic
High
100/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~195
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Naha
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:05
☀️ Noon
12:34
🌇 Sunset
19:02
⏱️ Daylight
12h 56m
Wind Speed
23.7 km/h
Moderate wind
Sunshine
11.2 hrs
Direct Sun (Cloud-free)
Humidity
82%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Naha
Smart Flight Estimator
Airport-to-Airport Logistics
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Travel Health & Safety in Naha
Travel Comfort Index
Real-time tourism conditions
Weather Quality
⛅ Good
Tourist Crowds
🔴 Very 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 excellent. Perfect for outdoor activities.
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, Naha on August 21 averages 29.8°C with a 32% precipitation probability. Wedding/Outdoor Event Score: 84/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Naha Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (August 21) in other destinations
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📍 Is Naha Worth Visiting on August 21?
Planning a trip to Naha on August 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 32% historical precipitation risk.
✈️ Travel Logistics: Approximately 195 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 29.8°C (hot soup). Wave conditions are generally fun waves with heights around 0.99m.
📊 Historical Extremes: The hottest August 21 recorded in the last 30 years saw temperatures hit 31.8°C in 2017, while the coldest dropped to 26.1°C in 2020.