30YearWeather
Siem Reap
When to avoid visiting Siem Reap, Cambodia
Seasonal Comparison

Least Favorable Months in Siem Reap

Based on 30 years of NASA satellite data, Siem Reap enjoys relatively good weather year-round. However, if you're comparing months, September, May, June are the least favorable — though still perfectly visitable.

September52/100May53/100June53/100

Good news: Siem Reap has no truly bad months!

With a score of 52/100, even September(the "worst" month) is still a reasonable time to visit. These months are simply the least favorable compared to other months in Siem Reap, not objectively bad. Many travelers enjoy visiting during these periods and benefit from lower prices and fewer crowds.

Why September is the Least Favorable (But Still Okay) Time to Visit Siem Reap

Is September a Good Time to Visit Siem Reap?

👌A reasonable choice for your trip
Short Answer

Siem Reap in September tests even seasoned travelers: 31°C daytime temperatures and 86% humidity mean early mornings or evenings are your best windows for sightseeing.

Decision Factors

Oppressive heat and humidity

30.5°C with 86% humidity - challenging conditions

High rainfall period

79% rain probability, 7.9mm average

Vaccinations required

Yellow Fever

Feels significantly hotter than 30.5°C

Heat index: 41°C due to 86% humidity

Health precautions needed

Be aware of: Leptospirosis, Melioidosis, Schistosomiasis

Shoulder season - balanced conditions

50% of peak - good value with moderate crowds

Good For

  • 💼
    Business travelers

    Climate-controlled meetings unaffected by weather

Who Should Avoid

  • 👨‍👩‍👧‍👦
    Families with children

    41°C heat index dangerous for children

  • 👴
    Elderly travelers

    Heat index of 41°C poses health risks

  • 🥾
    Outdoor enthusiasts

    79% rain probability disrupts outdoor activities

  • 📸
    Photographers

    90% cloud cover limits natural light opportunities

900 observations30-year historical data
Confidence: 90%

Key Challenges During These Months

Extreme Heat

Temperatures can become dangerously hot with oppressive humidity

Heavy Rainfall

Monsoon or rainy season brings frequent downpours and potential flooding

Months to Avoid: Detailed Breakdown

Worst52

September

Oppressive heat and humidity, High rainfall period

View details
2nd Worst53

May

Oppressive heat and humidity, Very hot conditions

View details
3rd Worst53

June

Oppressive heat and humidity, Very hot conditions

View details

Looking for the Best Time Instead?

Discover the optimal months to visit Siem Reap with ideal weather conditions, fewer crowds, and better prices.

Best Time to Visit Siem Reap

Frequently Asked Questions

When should I avoid visiting Siem Reap?

Based on 30 years of data, the most challenging months are September, May, June. Primary concerns include: oppressive heat and humidity, high rainfall period.

What is the worst month to visit Siem Reap?

September is typically the most challenging month, scoring only 52/100 in our travel conditions analysis.

Can I still visit during these months?

Yes, many travelers still visit during challenging months. Come prepared with appropriate gear, flexible bookings, and backup plans. Lower prices and fewer tourists can offset the weather challenges.

Are hotels cheaper during these months?

Often yes. Low season typically means reduced hotel rates, easier reservations, and fewer crowds at popular attractions. Some travelers prefer this trade-off.