Historical data suggests significant rain risk (85%) on May 18. If you seek sun, consider a different date. Bring rain gear! Colombo is currently in its most popular travel window, meaning vibrant crowds and premium pricing.
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Essential Travel Info for Colombo
Currency
LKR
Rs රු Sri Lankan rupee
Language
Sinhala
+1 more
Driving
Left side
Connect
SIM cards for unlocked phones may be pur...
Safety
Moderate Safety
GPI: 2.02
Colombo Weather Forecast for May 18
"Rainy & Overcast. Expect average highs of 29.4°C. 85% chance of rain."
What to Wear in Colombo in May
Based on historical data for May 18, Colombo typically experiences temperatures between 25.5°C and 29.4°C. We recommend packing t-shirt, light clothing, umbrella to stay comfortable. With a 85% chance of rain, keeping a raincoat or umbrella handy is a smart move.
Complete Packing Guide
Weekly breakdown & essential items for Colombo
Smart Suitcase
- T-Shirt
- Light Clothing
- Umbrella
Average High
29.4°C
Daytime Peak
Average Low
25.5°C
Nighttime Low
Feels Like
37.4°C
🔥 Heat index effect
Rain Chance
85%
Avg 7.3mm if it rains
Cloud Cover
84%
Moderate rain
Pressure
1008.7 hPa
Low volatility
Colombo 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
06:00 - 10:00
16:00 - 18:00
Type I-II
🔴 17 min to burn
Type III-IV
🟡 26 min to burn
Type V-VI
🟢 43 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
37.4°C
Feels hotter
😕 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 Sri Lanka
Flight Traffic
High
91/100 pressure index
Health Advisory
Required
2 vaccines • View Details →
Landing Slots
~84
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Colombo
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:24
☀️ Noon
12:38
🌇 Sunset
18:51
⏱️ Daylight
12h 26m
Wind Speed
17.4 km/h
Gentle breeze
Sunshine
8.5 hrs
Direct Sun (Cloud-free)
Humidity
86%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Colombo
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 Colombo
Travel Comfort Index
Real-time tourism conditions
Weather Quality
🌧️ Variable
Tourist Crowds
🟡 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 acceptable. Sensitive individuals should limit prolonged outdoor exertion.
Regional Safety Profile
Seismic Activity
Zero seismic activity detected in 30 years.
Cyclone Risk
Season: Apr - Dec
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Colombo on May 18 averages 29.4°C with a 85% precipitation probability. Wedding/Outdoor Event Score: 40/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Colombo 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
29.9°C • 80% rain
Score
46
May 23
29.2°C • 81% rain
Score
45
May 24
29.2°C • 81% rain
Score
45
💡 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 Colombo Worth Visiting on May 18?
Planning a trip to Colombo 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 29.4°C with a 85% historical precipitation risk.
✈️ Travel Logistics: Approximately 84 landing slots available daily during this period, indicating manageable crowd levels.
💉 Health Advisory: 9 vaccinations are recommended for Sri Lanka, including COVID-19.
🌊 Coastal Conditions: Water temperature averages 30.4°C (hot soup). Wave conditions are generally surfers only with heights around 1.54m.
📊 Historical Extremes: The hottest May 18 recorded in the last 30 years saw temperatures hit 30.4°C in 2021, while the coldest dropped to 23.8°C in 2018.