May 18 is generally a great time to visit Honolulu. While there is a slight chance of rain (23%), showers are usually brief. Expect comfortable 27°C weather. Expect a bustling atmosphere in Honolulu right now—this is when the city truly comes alive with visitors.
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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 May 18
"Warm & Sunny. Expect average highs of 26.7°C. 23% chance of rain."
What to Wear in Honolulu in May
Based on historical data for May 18, Honolulu typically experiences temperatures between 22.5°C and 26.7°C. We recommend packing t-shirt, light clothing to stay comfortable. Trends suggest it will stay mostly dry (23% 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
26.7°C
Daytime Peak
Average Low
22.5°C
Nighttime Low
Feels Like
27.8°C
☀️ Minor difference
Rain Chance
23%
Avg 0.8mm if it rains
Cloud Cover
46%
Light drizzle
Pressure
1017.5 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 86% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 30+ required, seek shade
05:00 - 10:00
16:00 - 19:00
Type I-II
🔴 11 min to burn
Type III-IV
🟡 17 min to burn
Type V-VI
🟢 28 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
21.4°C
Humid/Sticky
Heat Stress
Low
No heat warning
😐 Best outdoor time:
Morning hours (before 11 AM)
Marine Conditions
Marine Life
No special warnings. Enjoy the swim!
Swim Index
⚠️ Mixed Conditions
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in United States
Flight Traffic
High
100/100 pressure index
Health Advisory
Healthy
Routine only • View Details →
Landing Slots
~305
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Honolulu
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:53
☀️ Noon
12:29
🌇 Sunset
19:05
⏱️ Daylight
13h 11m
Wind Speed
22.3 km/h
Moderate wind
Sunshine
11.6 hrs
Direct Sun (Cloud-free)
Humidity
73%
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
🟡 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 May 18 averages 26.7°C with a 23% precipitation probability. Wedding/Outdoor Event Score: 95/100."
— 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
Better Alternatives Nearby
Consider these dates within ±7 days
May 11
26.6°C • 7% rain
Score
100
May 12
26.6°C • 7% rain
Score
100
May 13
26.6°C • 8% rain
Score
100
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (May 18) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Honolulu Worth Visiting on May 18?
Planning a trip to Honolulu on May 18? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year typically offers vibrant summer conditions averaging 26.7°C with a 23% historical precipitation risk.
✈️ Travel Logistics: Approximately 305 landing slots available daily during this period, indicating manageable crowd levels.
🌊 Coastal Conditions: Water temperature averages 25.2°C (tropical bath). Wave conditions are generally surfers only with heights around 1.34m.
📊 Historical Extremes: The hottest May 18 recorded in the last 30 years saw temperatures hit 29.1°C in 2025, while the coldest dropped to 22.1°C in 2024.