August 20 is statistically one of the best days of the year in Honolulu. With minimal rain risk (3%) and pleasant highs of 29°C, it's ideal for outdoor adventures. Honolulu is currently in its most popular travel window, meaning vibrant crowds and premium pricing.
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Essential Travel Info for Honolulu
Currency
USD
$ United States dollar
Language
English
Driving
Right side
Connect
The area code for Honolulu, and the rest...
Safety
Moderate Safety
GPI: 2.44
Honolulu Weather Forecast for August 20
"Warm & Sunny. Expect average highs of 28.9°C. 3% chance of rain."
What to Wear in Honolulu in August
Based on historical data for August 20, Honolulu typically experiences temperatures between 24.4°C and 28.9°C. We recommend packing t-shirt, light clothing to stay comfortable. Trends suggest it will stay mostly dry (3% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Honolulu
Smart Suitcase
- T-Shirt
- Light Clothing
Average High
28.9°C
Daytime Peak
Average Low
24.4°C
Nighttime Low
Feels Like
32.9°C
🔥 Feels warmer
Rain Chance
3%
Avg 0.4mm if it rains
Cloud Cover
40%
Light drizzle
Pressure
1016.3 hPa
Low volatility
Honolulu 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 30+ required, seek shade
06:00 - 10:00
16:00 - 18:00
Type I-II
🔴 13 min to burn
Type III-IV
🟡 20 min to burn
Type V-VI
🟢 33 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
23.3°C
Humid/Sticky
Heat Index
32.9°C
Feels hotter
😐 Best outdoor time:
Morning hours (before 11 AM)
Marine Conditions
Jellyfish Warning
High water temps may attract jellyfish swarms.
Swim Index
⚠️ Mixed Conditions
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in United States
Flight Traffic
High
82/100 pressure index
Health Advisory
Healthy
Routine only • View Details →
Landing Slots
~250
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Honolulu
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:12
☀️ Noon
12:36
🌇 Sunset
18:59
⏱️ Daylight
12h 46m
Wind Speed
23.4 km/h
Moderate wind
Sunshine
11.8 hrs
Direct Sun (Cloud-free)
Humidity
72%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Honolulu
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 Honolulu
Travel Comfort Index
Real-time tourism conditions
Weather Quality
☀️ Excellent
Tourist Crowds
🔴 Very 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 excellent. Perfect for outdoor activities.
Regional Safety Profile
Seismic Activity
Rare minor tremors. Buildings are earthquake-resistant.
Eastern Pacific Hurricane Risk
Season: May - Nov
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, Honolulu on August 20 averages 28.9°C with a 3% precipitation probability. Wedding/Outdoor Event Score: 100/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Honolulu Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Compare Other Cities
Same date (August 20) in other destinations
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📍 Is Honolulu Worth Visiting on August 20?
Planning a trip to Honolulu on August 20? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year typically offers vibrant summer conditions averaging 28.9°C with a 3% historical precipitation risk.
✈️ Travel Logistics: Approximately 250 landing slots available daily during this period, indicating manageable crowd levels.
🌊 Coastal Conditions: Water temperature averages 26.7°C (tropical bath). Wave conditions are generally surfers only with heights around 1.23m.
📊 Historical Extremes: The hottest August 20 recorded in the last 30 years saw temperatures hit 30.9°C in 2019, while the coldest dropped to 22.9°C in 2023.