Siem Reap weather at a glance
Siem Reap has two seasons. The dry season runs from November to April, the rainy season from May to October, with September and October the wettest months. Angkor Thom can be visited in every season, so the question is how much heat and rain you want to plan around.
The figures on this page are long-term monthly averages for Siem Reap. They show the pattern, not a forecast for your dates. January's 0 mm, for example, is an average and no promise of a rain-free day. If you want help covering the city on a hot or wet day, see our Angkor Thom tours by bike, tuk-tuk and guide.
Siem Reap weather by month
Average daily maximum and minimum temperature and monthly rainfall.
| Month | Max °C | Min °C | Rain (mm) | What to expect |
|---|---|---|---|---|
| January | 30.2 | 18.2 | 0 | Dry, cool nights |
| February | 32.8 | 21.7 | 8 | Dry, warming up |
| March | 34.1 | 23.5 | 20 | Hot, little rain |
| April | 34.7 | 24.8 | 52 | Hottest month |
| May | 33.5 | 24.7 | 134 | Rain builds |
| June | 32.2 | 24.1 | 163 | Rainy season |
| July | 31.4 | 23.9 | 179 | Rainy season |
| August | 31.5 | 24.0 | 211 | Rainy season |
| September | 31.1 | 23.8 | 247 | Wettest month |
| October | 30.1 | 22.7 | 210 | Very wet |
| November | 30.1 | 20.2 | 77 | Rain eases |
| December | 30.0 | 18.1 | 11 | Dry, cool nights |
For most visitors, November to February gives the best balance of low rain and bearable heat. December and January have the coolest nights, at about 18 °C.
Our pick: the moat at sunset
A short late-afternoon boat ride, timed for sunset, for a day when you want to stay out of the midday heat.
Hand-picked tours, booked through GetYourGuide. Prices are indicative starting prices in US dollars (as of October 2026). Tap a tour for live availability and the current price in your currency.
Angkor Thom tours for any season
Bike, tuk-tuk and guided visits through Angkor Thom, with live prices and availability.
Best time to visit Angkor Wat and Angkor Thom
The same seasons apply across the whole park.
November to February
Rain is low and the heat is easier. This is the natural choice if your dates are flexible. For temple-by-temple timing, see the best time to visit Angkor Wat.
March and April
Dry, but hot. April is the hottest month with a maximum of 34.7 °C. Plan shaded breaks and drink more water than you expect to need.
May to October
The rainy season. Showers and storms are likely, September and October especially. You can still see the temples. Keep a plan B for the wettest hours and expect slippery stone.
Park hours also matter more than the month. The park as a whole is open from 05:00 to 18:30, while the Baphuon and the Bayon are open from 07:30 to 17:30. Individual monuments set their own times, so confirm them on the day.
Rainy season safety at Angkor Thom
APSARA, the authority for the park, issued rainy season safety guidelines in May 2026. They warn about heavy rain, wind, wet slippery stones and thunderstorms. They recommend shoes with good tread, insect repellent and attention to local warning signs.
In a thunderstorm, do not shelter or park under large trees. Branches fall and trees can topple. Steps and stone surfaces at the Baphuon and on the terraces deserve extra care in wet weather.
Cover your shoulders and knees at the temples in any season, and stay on marked paths. Planning the rest of your trip? See where to stay for Angkor Thom and getting there.
Siem Reap weather: frequently asked questions
What is the best month to visit Angkor Thom?
For most visitors, November to February: low rain and bearable heat, with the coolest nights in December and January.
When is the rainy season in Siem Reap?
From May to October. September and October are the wettest months, with 247 mm and 210 mm in the figures above.
How hot is it in April?
April has the highest average maximum on this page, 34.7 °C, with a minimum of 24.8 °C and 52 mm of rain.
Is Angkor Thom open during the rainy season?
Yes, it can be visited all year, but storms and wet stone change how you plan the day. Check on the day for closed areas, and avoid sheltering under large trees.
Does January never rain?
The 0 mm figure is a long-term average and no guarantee. Check the forecast before you go.
What should I wear in the rainy season?
Cover your shoulders and knees at the temples and wear shoes with good tread, because wet stone is slippery. Bring insect repellent and keep an eye on local warning signs.