- Off Peak Months
- May to October
- Peak Tourism Months
- December to January
Updated July 2026 · Sources cited: climatestotravel.com, weather-atlas.com
Good to know
Good to Know
- December and January are the coolest and driest—ideal for nomads avoiding heat stress.
- March and April are nearly unbearable due to extreme heat and haze; many expats travel abroad during this period.
- September is the wettest month (252+ mm). Flooding can affect Phnom Penh; waterproof gear and flooded-street awareness essential.
- Umbrella useless during monsoon; a 2,000-riel plastic poncho is cheaper and more practical. Plastic flip-flops are standard rainwear.
- Rainy season is genuinely quieter and less touristy than November–February; if you tolerate humidity and afternoon showers, costs drop significantly.
- Year-round humidity is high; air conditioning, loose cotton clothing, and skin care are essential.
Seasons
Dry/Cool Season
- Months
- November to February
- Rainfall Mm
- 12–80
- Characteristics
- Pleasant, minimal rain. Best period for nomads and travelers. December and January are the coolest months.
- Rainfall Inches
- 0.5–3.1
Temperature
- Low Celsius
- 22
- High Celsius
- 33
- Low Fahrenheit
- 72
- High Fahrenheit
- 91
Hot Season
- Months
- March to April
- Rainfall Mm
- 2–30
- Characteristics
- Oppressively hot and humid. Peak temperatures can reach 37–40°C (99–104°F). Hazy skies possible from slash-and-burn farming.
- Rainfall Inches
- 0.1–1.2
Temperature
- Low Celsius
- 25
- High Celsius
- 35
- Low Fahrenheit
- 77
- High Fahrenheit
- 95
Monsoon/Rainy Season
- Months
- May to October
- Rainfall Mm
- 100–319
- Characteristics
- Heavy, frequent rainfall, high humidity (peaks at ~84% in September–October). Peak rainfall in September (252–319 mm). Afternoon rains bring relief. Risk of street flooding. Fewer tourists, cheaper accommodation.
- Rainfall Inches
- 3.9–12.6
Temperature
- Low Celsius
- 24
- High Celsius
- 32
- Low Fahrenheit
- 75
- High Fahrenheit
- 90
Annual Summary
- Snowfall
- None
- Annual Rainfall Mm
- 1415
- Annual Rainfall Inches
- 56
- Average Temperature Celsius
- 28
- Average Temperature Fahrenheit
- 82
Off Peak Months
May to October
Peak Tourism Months
December to January
AI-generated estimateData refreshed July 2026
Sources cited for this category
These are the sources cited in this climate & weather research for this city. Individual figures may not each trace to one of them.
More About Phnom Penh
Data last updated July 2026 · Verify anything important.