Historical data suggests significant rain risk (83%) on September 20. If you seek sun, consider a different date. Bring rain gear! As it's peak season for Phnom Penh, we recommend booking your stay well in advance to secure the best rates.
View the full calendar
Essential Travel Info for Phnom Penh
Currency
KHR
៛ Cambodian riel
Language
Khmer
Driving
Right side
Connect
Cheap SIM cards from US$2 for GSM phones...
Safety
High Safety
GPI: 1.882
Phnom Penh Weather Forecast for September 20
"Rainy & Overcast. Expect average highs of 30.5°C. 83% chance of rain."
What to Wear in Phnom Penh in September
Based on historical data for September 20, Phnom Penh typically experiences temperatures between 24.5°C and 30.5°C. We recommend packing t-shirt, light clothing, umbrella to stay comfortable. With a 83% chance of rain, keeping a raincoat or umbrella handy is a smart move.
Complete Packing Guide
Weekly breakdown & essential items for Phnom Penh
Smart Suitcase
- T-Shirt
- Light Clothing
- Umbrella
Average High
30.5°C
Daytime Peak
Average Low
24.5°C
Nighttime Low
Feels Like
41.2°C
🔥 Heat index effect
Rain Chance
83%
Avg 8.9mm if it rains
Cloud Cover
88%
Moderate rain
Pressure
1008.3 hPa
Low volatility
Phnom Penh 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
🔴 35 min to burn
Type III-IV
🟡 53 min to burn
Type V-VI
🟢 88 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
27.9°C
Humid/Sticky
Heat Index
41.2°C
Feels hotter
😕 Best outdoor time:
Early morning (6-9 AM) or evening (after 6 PM)
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in Cambodia
Flight Traffic
High
81/100 pressure index
Health Advisory
Required
2 vaccines • View Details →
Landing Slots
~48
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Phnom Penh
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:50
☀️ Noon
11:55
🌇 Sunset
17:59
⏱️ Daylight
12h 8m
Wind Speed
12.5 km/h
Gentle breeze
Sunshine
7.5 hrs
Direct Sun (Cloud-free)
Humidity
86%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Phnom Penh
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 Phnom Penh
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 excellent. Perfect for outdoor activities.
Regional Safety Profile
Seismic Activity
Zero seismic activity detected in 30 years.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Phnom Penh on September 20 averages 30.5°C with a 83% precipitation probability. Wedding/Outdoor Event Score: 42/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Phnom Penh Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
September 13
30.9°C • 81% rain
Score
43
September 14
30.8°C • 82% rain
Score
43
September 21
30.5°C • 82% rain
Score
43
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (September 20) in other destinations
Prague
Czech Republic
Paris
France
Rome
Italy
London
United Kingdom
Amsterdam
Netherlands
🌍 Explore the same date in different destinations around the world
📍 Is Phnom Penh Worth Visiting on September 20?
Planning a trip to Phnom Penh on September 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 30.5°C with a 83% historical precipitation risk.
✈️ Travel Logistics: Approximately 48 landing slots available daily during this period, indicating manageable crowd levels.
💉 Health Advisory: 10 vaccinations are recommended for Cambodia, including COVID-19.
📊 Historical Extremes: The hottest September 20 recorded in the last 30 years saw temperatures hit 32.3°C in 2025, while the coldest dropped to 23.9°C in 2019.