Living in Siem Reap as a European: the climate-smart guide (2026)

Siem Reap sits at 13 degrees north, firmly in the tropical monsoon belt. The weather splits into two clear seasons, with short transitional weeks in between.

Dry season (November to April) brings sunny skies, low humidity, and cool nights down to 20 degrees Celsius in December and January. This is the high tourist season for a reason. March onward, the heat builds fast, and April is the cruellest month with highs around 38 degrees Celsius and still air.

Wet season (May to October) flips the switch. Humidity climbs past 80 percent, afternoon storms roll in almost daily, and the landscape turns vivid green. Rain usually falls in short heavy bursts rather than all-day drizzle, so life does not stop. September is the wettest month on record.

Between them, May and November act as short shoulder weeks where locals often say the air feels heaviest before the rain releases it.

Most Europeans notice three phases in their first months. Week one to three: fatigue, restless sleep, and a feeling that the heat is personal. Week three to six: the body starts sweating earlier and more efficiently, thirst regulation improves, and afternoon energy returns. After six weeks: you stop thinking about the heat except on the worst April days.

Four habits speed this up:

• Hydrate before you feel thirsty. Target three liters of water per day, more if you walk or cycle. Add electrolytes if you sweat heavily.
• Sleep cool. AC at 25 to 26 degrees Celsius from 22h to 6h beats AC at 20 degrees all night. Your body recovers better and your electricity bill drops.
• Light natural fabrics. Linen, cotton, bamboo. Synthetic performance fabrics trap heat and smell unpleasant fast.
• Rest at noon. The local siesta between 12h and 14h is not laziness, it is thermoregulation. Copy it.

Cambodia sits among the ten countries most exposed to climate risk worldwide. The trend for Siem Reap specifically is well documented.

• Average temperatures have risen about 1.5 degrees Celsius since 1980, faster than the global average. The number of days above 35 degrees Celsius has roughly doubled in the past forty years.
• Monsoon rainfall is more erratic. Total annual rainfall has not dropped much, but it now comes in fewer and heavier events, with longer dry gaps. This stresses agriculture and the Tonle Sap ecosystem.
• The Angkor basin is under water pressure. Groundwater pumping for the hotel zone and changes in monsoon timing have affected the moats and baray reservoirs around the temples. Authorities are experimenting with new water management plans.
• Dengue and heat-related illness are on the rise. Warmer nights allow mosquitoes to breed year-round, and heat waves are now a real health concern for older residents.

None of this is reason to leave Siem Reap, but it is reason to settle in with open eyes. Choose housing with good passive cooling, keep a dengue prevention routine, and follow local climate advisories during heat peaks.

Europeans often arrive expecting constant AC. After three months, most of them find a hybrid setup that respects both comfort and budget.

The smart combo: ceiling fans in every room, one inverter AC in the bedroom used only at night, and good cross-ventilation during the cooler hours of the day. Running an inverter AC at 26 degrees Celsius for eight hours costs roughly three to five USD per night. An old non-inverter unit can triple that.

Building quality matters more than AC power. A concrete ground floor with thick walls and shaded windows stays noticeably cooler than a cheap second-floor apartment with west-facing walls. If you are apartment-hunting, visit between 14h and 16h, when the worst-designed units reveal themselves.

Expected monthly electricity bill for a couple in a mid-range two-bedroom apartment: 40 to 120 USD depending on AC habits. Electricity costs about 0.25 USD per kWh, which is high by regional standards.

The sun rises around 6h and sets around 18h year-round, with little variation. This stable light drives a rhythm that Europeans adapt to within a few weeks.

• 6h to 9h: cool and golden. Best time for running, cycling, temple visits, and errands.
• 9h to 12h: pleasant for indoor work, coffee meetings, shopping in ventilated places.
• 12h to 14h: lunch and siesta. The streets quiet down. Your body will thank you for resting.
• 14h to 16h: the hottest window. Stay indoors if possible. This is also when wet-season storms usually break.
• 16h to 18h: the city wakes up again. Great time for a swim, a market visit, or sunset drinks by the river.
• 18h onwards: social life peaks. Restaurants, pub street, river walk, community events.

Fighting this rhythm with a strict 9-to-17 European schedule works for a few weeks, then reality wins.

Siem Reap has solid private clinics and a handful of international-standard hospitals within a four-hour drive to Phnom Penh. For day-to-day tropical health, build these habits from day one.

• Sunscreen SPF 50 daily, even on cloudy days. Cambodian UV index averages 9 to 11, versus 5 to 7 in Southern Europe in summer.
• Mosquito repellent with DEET 20 to 30 percent around dawn and dusk, especially in the wet season. Dengue is endemic and there is no cure, only supportive care. Avoid stagnant water near your home.
• Drink filtered water. Tap water is not potable. A home filter system costs around 100 USD and saves hundreds of plastic bottles per year.
• Recognize heat exhaustion. Headache, nausea, cold sweats, weak pulse. Stop, drink, cool down, elevate your feet. Heat stroke (confusion, hot dry skin, high temperature) is a medical emergency.
• Get local travel insurance. A single clinic visit for suspected dengue runs 100 to 300 USD. A real hospitalization without insurance can cost thousands.

After a few hundred conversations with expats settling in Siem Reap, a pattern emerges.

Common mistakes:

• Renting a cheap flat in April when it is cool-ish. The same unit turns into an oven by June.
• Keeping European eating habits. Heavy meat-and-cheese dinners at 20h in 32 degrees Celsius humidity is brutal. Locals eat light and early.
• Ignoring mosquito bites. One bad dengue episode changes priorities fast.
• Forcing a European work rhythm. Afternoon calls with Paris at 15h Cambodia time collide with your body's hottest hour.

What works:

• Embracing rice, noodles, soup, fresh fruit, and lighter portions.
• Building a local network early. Siem Reap's expat community is small and warm. Community knowledge about which landlord is reliable or which clinic is best beats any Google search.
• Taking climate seriously. This is not Southern France with palm trees. It is a tropical monsoon city adapting to a changing climate, and that deserves respect.