Climate in Siem Reap, Cambodia

Siem Reap climate

Heat, humidity, monsoon rain, flooding, and indoor comfort shape the whole year

The World Meteorological Organization publishes Siem Reap climate information, while Cambodia's travel guidance places the rainy season from May through October and the dry season from November through April. The advisory notes that March and April can exceed 35 degrees Celsius and sometimes reach above 40 degrees, while flooding is most frequent during the rainy months. The published fields show 30.4 degrees Celsius, 68 percent humidity, and AQI 40.

Choose a home around air conditioning, fans, shade, ventilation, screens, roof, gutters, raised floors, drainage, mold, mosquitoes, water storage, power, internet, smoke, road surface, and indoor activity. Try the hospital, pharmacy, grocery, airport, museum, and home routes in wet and dry conditions. A pleasant dry-season evening does not answer whether the address works during a hot afternoon, a storm, or a flooded road.

Living through the seasons

Winters are the easier season. Summer heat deserves a closer look.

Overall Comfort: Moderate

Average Summer High: 89°F
Days Above 90°F: 188 days/year
Summer Feel: Poor

Average Winter Low: 71°F / 22°C
Days Below Freezing: 0 days/year
Winter Feel: Excellent

The shape of the year

Humidity, comfortable months, and sunshine show how the seasons differ.

Humidity: 74%
Comfortable Months: 0 months
Solar Exposure: 1887 peak sun hrs/yr

Air, allergies, and weather

Air quality and allergies shape day to day comfort. The best months and weather risks help with timing.

Air and allergies

Air Quality: Excellent
Allergy Levels: Moderate

Current AQI

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Current PM2.5

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Timing and weather

Long Term Fine Particle Pollution: 8.7 µg/m³ 2021-2025 modeled average
Best Months: Dec, Nov, Oct
Toughest Months: Mar, Feb, Apr
Heat Risk: High
Drought Risk: Medium - High (0.6-0.8)
Weather Volatility: Strong

Siem Reap in everyday life

Could Siem Reap work for you?

What may work well

Siem Reap's heritage, museum, craft, library, and indoor performance options can keep the week active when heat or rain limits outdoor plans.
The airport, city services, and named care facilities give a practical base for a warm seasonal setting.

What to think about

Heat, humidity, heavy rain, flooding, slippery surfaces, mosquitoes, mold, power, water, smoke, and road conditions can limit outdoor access.
Cooling, ventilation, drainage, roof, screens, water, power, insurance, and care travel deserve an exact-home review.

Choose Siem Reap for the whole year

Inspect comfort and moisture
Review cooling, fans, ventilation, screens, roof, gutters, drainage, mold, shade, water, power, smoke, and indoor air.
Plan around monsoon weather
Pair museum, market, river, Angkor, care, airport, and family trips with shade, hydration, rain alternatives, safe surfaces, flood information, and transport backup.
Price seasonal upkeep
Ask about cooling, power, water, roof, drainage, mold, mosquitoes, insurance, vehicle use, road condition, flood repairs, and the route to care.

Questions retirees ask

What is the weather like in Siem Reap?

Siem Reap has a hot dry season and a rainy season from roughly May through October. The published fields show 30.4 degrees Celsius, 68 percent humidity, and AQI 40. Plan for cooling, drainage, mold, mosquitoes, power, water, smoke, safe roads, and indoor choices.

When is Siem Reap's rainy season?

Cambodia's travel guidance places the rainy season from May through October and the dry season from November through April. Flooding is more frequent in the rainy months, so review the home, road, roof, drainage, power, transport, and care route in wet conditions.

Siem Reap can suit someone who enjoys warmth and seasonal rain, provided the home controls heat and moisture and the household has workable options for flooding, road changes, power, water, smoke, and care throughout the year.

Local context for Siem Reap

APSARA water and environment work
Used for Angkor reservoirs, canals, Siem Reap river work, flood danger, and the shared water landscape
Ministry of Tourism Tonle Sap
Used for Tonle Sap ecology, community life, seasonal water changes, and lake visits
U.S. State Department Cambodia advisory
Used for Theft around markets and tourist sites, tuk tuk precautions, emergency number 119, ambulance limits, health payment, roads, flooding, and landmine cautions
World Meteorological Organization Siem Reap
Used for Siem Reap climate reference information and monthly weather fields
Open-Meteo documentation
Used for Temperature, humidity, and climate field reference used for the published Siem Reap readings
Open-Meteo air quality documentation
Used for Air quality field reference and the limit of a gridded reading

Sources

Climate comfort helps estimate how practical daily life may feel across the year, especially for heat, humidity, cold, and seasonal constraints.

Seasonal timing, health conditions, air conditioning, air quality, and elevation can change the lived experience.

NASA POWER
Used for Overall Comfort, Summer Feel, Average Summer High, Days Above 90°F, Winter Feel, Average Winter Low, Days Below Freezing, Humidity, Comfortable Months, Solar Exposure, Best Months, Toughest Months, Allergy Levels, Heat Risk
Open-Meteo Air Quality + Humidity Heuristic
Used for Air Quality, Long-Term Fine-Particle Pollution, Weather Volatility
Checked 2026-07-10
World Resources Institute (WRI)
Used for Drought Risk
Checked 2026-07-13

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Research and writing byGrant Gibson

How this city research is made

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