Siem Reap in the Rainy Season: Why Some Say It Is the Best Time (2026)

The rainy season is the best time to visit Siem Reap for one kind of traveler: the one who starts the temple day at 5:00 a.m. and does not need a clear sunset. From June to October the rain falls mostly in the afternoon, the temples hold about a third of January’s visitors, the moats and the lake fill, and hotels drop to their lowest rates. The trade is humidity, mud and an afternoon that belongs to the weather.

Search results split into two camps. One calls May to October the monsoon and tells travelers to avoid it. The other calls it the green season and promises empty temples without mentioning that September brings 288 mm of rain, that May is still 35°C, or that the bird colonies of Prek Toal are a dry-season trip. Neither says which rainy month is which, and the difference between June and September is larger than the difference between June and December.

This guide sets out how the storms behave, what the season gives and takes at each site, which months are worth it, and how to plan a rainy-season day, as a detail of the best time to visit Siem Reap. Climate figures are long-term means from the Deutscher Wetterdienst record, and prices, hours and visitor figures were checked against Angkor Enterprise and operator sources in October 2026.

The Rain Has a Timetable

The single fact that changes the decision is the hour of the rain. In Siem Reap the rainy season does not mean grey days of drizzle. It means a pattern: a clear or partly cloudy morning, clouds building from about 1:00 p.m., and a storm of one to three hours, most often between 2:00 p.m. and 6:00 p.m., that frequently clears before dark. From May to September about 17 or 18 days a month bring some rain, which works out to roughly half the afternoons.

The temples, meanwhile, are best seen early in every month. The park opens at 5:00 a.m. and the coolest, emptiest hours are the first four. A schedule built around that morning, which is how Angkor should be visited anyway, finishes before the clouds build. In June the sun rises around 5:37 a.m., the earliest of the year, so the rainy season actually gives the longest dry mornings: six or seven hours before the weather turns.

The exceptions are real and should be planned for. In September, some storms start at noon and continue into the night. In early October, the tail of a typhoon crossing the region can bring two or three days of steady rain. And in May the storms are the most violent of the year, with wind and dust ahead of an hour of heavy rain. The weather by month guide gives the figures for each month.

What the Rainy Season Gives

Fewer people at every temple

In 2025, Angkor Enterprise sold passes to about 146,000 foreigners in January and about 47,000 a month from June to October. That is roughly 4,700 a day against 1,500. The difference is most visible at the three places where crowds concentrate: the Angkor Wat sunrise, the Bayon at 8:00 a.m. and the corridors of Ta Prohm. In September the causeway at dawn can hold a few dozen people. The crowds by month guide shows the pattern in detail.

Water where the postcards put it

The rains fill Angkor Wat’s moat, the barays and the ponds in front of the temples, which gives the reflections dry-season visitors photograph from a puddle. The Tonle Sap grows from about 2,500 to 3,000 km² in April to as much as 16,000 km² around October and November. Phnom Kulen’s waterfall reaches full volume from August to November, and the carved riverbed at Kbal Spean has water running over its lingas. The landscape turns green from June, with rice being planted across the plain.

Lower prices for the same pass

Hotels move to low-season rates from May until October, and many add a free night or a transfer. The hotel prices by month guide tracks the pattern rather than freezing a figure. The Angkor Pass costs exactly the same, $37, $62 or $72, but the three-day pass can be used on any three days within seven, so a wet day can simply be skipped without losing a ticket day. Tuk-tuk drivers have more empty days and more room to negotiate.

What the Rainy Season Takes

Humidity

Humidity averages 70 to 75 percent from June to October, against 58 to 59 percent from January to April. A 31.7°C September afternoon has January’s thermometer reading and feels far heavier. Travelers who struggle with heat should count humidity, not temperature, when they compare months.

Footing and roads

Rain makes the stone slick. Stairways at Angkor Wat and Phnom Bakheng need care, and Ta Prohm’s root-covered corridors are slippery enough to matter with children. The dirt approaches at Beng Mealea and Koh Ker turn to mud. The road up Phnom Kulen is slippery after storms and should be checked with the driver. In September, side streets in the Wat Bo and Sok San areas can flood for a few hours after the heaviest storms.

Sunsets and sunrises

A clear sunset in July comes about one evening in three, and a clean sunrise perhaps one morning in two or three. Anyone whose trip is built around a single sunrise photograph should plan two attempts or choose the dry season. The sunset spots guide is honest about the odds.

The bird season and the dry tracks

Prek Toal, the waterbird sanctuary on the lake, is a dry-season trip: its tours run from November to March, and in the wet months the birds disperse. Cycling and quad routes on dirt tracks turn to mud. Anyone whose trip centers on either should not come between June and October.

Which Sites the Rain Improves, and Which It Spoils

Not every temple responds to the season in the same way, and a rainy-season itinerary should lean on the ones that gain.

The forest temples gain most. Ta Prohm, Preah Khan and Beng Mealea are built into forest, and from June the moss turns green on every wall, the light under the canopy softens and the trees shade the paths from the humid midday. They are also the sites where the footing suffers most, so they belong to the late morning, after the dew has dried and before the storm. Beng Mealea’s rebuilt walkway makes it the safest of the three in wet weather.

The moated temples gain the reflections. Angkor Wat, with its moat and the ponds in front of the western entrance, and Srah Srang, the royal bathing pond opposite Banteay Kdei, are at their fullest from August. A still morning after a night of rain gives the mirror image that dry-season visitors find only in a puddle.

Banteay Srei changes color. Its red sandstone darkens when wet, which some photographers prefer, and it is a morning temple in any season. The road to it is paved, so rain does not stop a tuk-tuk.

The high viewpoints lose. Phnom Bakheng, Pre Rup and Phnom Krom are sunset sites, and sunset is when the storms arrive. They are worth trying when the afternoon has stayed clear, and not worth a dedicated trip in July or September. Open stone summits are also the wrong place to be when lightning approaches: leave them as soon as thunder is audible.

The far trips split. Phnom Kulen gains a full waterfall and keeps a morning schedule that suits the season, but its road is slippery after storms. Koh Ker’s tracks between the outlying sanctuaries flood, and the Koh Ker guide covers the long day it takes.

The Rainy Months, One by One

May

The honest verdict: the hardest month of the season, and the cheapest week to arrive. The average high is still 34.8°C and humidity rises to 66 percent, while 150 mm of rain falls over 17 days. The first storms are violent and short. The lake is at its lowest. The limitation: May combines the heat of April with the humidity of the rains, and nothing on the water is yet worth the drive.

June

The honest verdict: the best month for people per temple. The sunrise is the earliest of the year, the dry mornings the longest, the visitors the fewest and the rice fields freshly planted. Rain averages 214 mm over 18 days, almost all in the afternoon. The limitation: humidity at 70 percent makes 33.6°C feel close to April, and the lake and the waterfall are still building.

July

The honest verdict: the family month, with European and Australian school holidays bringing a modest increase in visitors. Rain eases to 193 mm, the high to 32.9°C and the moat is full and still. The sunset, around 6:35 p.m. on the 15th, is the latest of the year. The limitation: roughly one clear sunset in three, and the flooded forest is not yet deep enough to paddle.

August

The honest verdict: the month for the lake, with the temples as a bonus. The Tonle Sap takes its biggest rise and the Kampong Phluk forest paddle usually reopens, as the floating villages comparison explains. Rain averages 209 mm, spread over the most rainy days of the year. The limitation: the paths at Ta Prohm and Beng Mealea are at their slipperiest.

September

The honest verdict: the wettest month and the emptiest temples, for travelers who accept both. Rain averages 288 mm, with the heaviest storms of the year and some full days of rain. Hotel rates sit at their yearly floor. The September equinox, around September 23, aligns the sunrise with Angkor Wat’s central tower for anyone who gets a clear dawn. The limitation: flooded side streets, slippery roads and the need for a second pair of shoes.

October

The honest verdict: the best-value window of the year, especially after the 20th. Storms shorten and skip days in the second half, the lake and the waterfall are near their peak, and rates stay low until the last week. Pchum Ben falls on October 10 to 12 in 2026: many small businesses close, buses sell out and tuk-tuk drivers go home to their provinces. The limitation: a typhoon tail can make any given week as wet as September.

How to Plan a Rainy-Season Day

5:00 a.m. to 12:30 p.m.: the temples. Leave the hotel at 4:45 a.m. for sunrise, or at 6:30 a.m. for the first temple after it. Plan the most exposed sites first, the Bayon and Angkor Wat’s upper level, and keep the shaded ones, Ta Prohm and Preah Khan, for the late morning. The three-day itinerary follows this structure in every season.

1:00 p.m. to 4:00 p.m.: under a roof. Lunch, a pool, a nap, or a covered visit. The Angkor National Museum charges about $12 at the counter and is open 8:30 a.m. to 6:00 p.m. from April to September and until 6:30 p.m. from October. The Artisans Angkor Craft Centre on Stung Thmey Street runs guided workshop visits daily from 7:30 a.m. to 6:00 p.m. A cooking class with a market visit costs $26 to $36 per person on booking platforms in 2026, as the cooking classes guide explains.

5:00 p.m. onward: after the storm. The hour after a storm is cool and clear, which suits a walk along the river or a late temple if the sky opens. In the evening, Phare, the Cambodian Circus performs under a big top at 8:00 p.m. year-round, with tickets from $18 to $38 for adults. The rainy day with kids guide has more covered options for families.

Dress and kit. Shoulders and knees covered in every temple, in quick-drying fabric. Shoes with grip. A poncho rather than an umbrella in a tuk-tuk. A dry bag for the phone. The what to pack guide has the full list.

By Situation

You hate crowds more than rain

June or September. The fewest visitors of the year, the emptiest sunrise causeway and the lowest rates. Start at 5:00 a.m. and accept a wet afternoon.

You are traveling with children on school holidays

July or August, with temples before noon and a pool or a covered visit after. Keep children off the wet stairways and away from Ta Prohm after heavy rain. Evenings under a roof work best in these months: Phare’s big top, the Angkor National Museum before it closes, or a dinner show such as the Apsara Theatre on Street 26 in Wat Bo, with Khmer dinner at 7:30 p.m. and the performance at 8:30 p.m., open to non-guests. The limitation of the dinner show: it runs late for young children. Siem Reap with kids covers the heat and footing rules.

You want the lake and the waterfall

Late August to October. The Tonle Sap is near its peak, the forest paddle runs, and the Kulen waterfall is full. Pair them with temple mornings.

You want a reliable sunrise or sunset photograph

Do not choose the rainy season, or plan at least two attempts on a three-day pass. The odds of a clear sky are about one in two or three.

You cannot tolerate humidity

Avoid May, August and September. If the dates are fixed, book a car with air conditioning for the temple mornings rather than a tuk-tuk.

What It Actually Costs

Item	Price	Rainy-season note
Angkor Pass, 1, 3 or 7 days	$37, $62, $72	Same as January. Three-day pass usable over seven days
Tuk-tuk, small circuit day	$18 to $25	More room to negotiate in low season
Car with driver, park day	$35 to $60	Shelter from storms and humidity
Rain poncho	A dollar or two at a minimart	Needed May to October
Angkor National Museum	About $12	Covered afternoon option
Cooking class with market	$26 to $36 per person	Usually morning or afternoon sessions
Phare, the Cambodian Circus	$18 to $38 per adult	8:00 p.m., under a big top
Kampong Phluk boat and fee	$22 per person, plus $5 forest paddle	Best from August
Phnom Kulen ticket	$20	Waterfall fullest August to November

Hotel rates are the largest seasonal saving and are not quoted here because they change weekly. What the season adds without a receipt: a second pair of shoes, a dry bag and a laundry bill for clothes that never quite dry in 75 percent humidity. Dollars work everywhere, with riel given as change below $1. The daily budget guide sets a low-season day against a January day.

What Other Guides Get Wrong

1. Calling it the monsoon and telling people to stay away. Most rain falls as afternoon storms between 2:00 p.m. and 6:00 p.m. A temple day from 5:00 a.m. to 1:00 p.m. is barely touched.
2. Treating May to October as one season. May is hot and violent, June is long dry mornings, September is the wettest month and late October is the best value of the year.
3. Promising empty temples and full lakes in the same month. In June and July the temples are emptiest but the lake and the waterfall are still building. The water peaks from late August to November.
4. Ignoring humidity. At 70 to 75 percent, a 32°C rainy-season day feels hotter than its number.
5. Forgetting what the rain closes. Prek Toal’s bird season runs November to March, and dirt-track cycling and quad routes turn to mud.
6. Assuming the pass costs less. The Angkor Pass is $37, $62 or $72 in every month. The saving is the hotel, not the ticket.

Addresses, hours, prices and transport times checked against operator websites and official sources in October 2026. Hours change seasonally and prices change often. Confirm anything time-critical with the operator.

Where to Go Next

The rainy season is one of three seasons weighed against crowds, prices and festivals in the best time to visit Siem Reap, and the weather by month guide gives the figures for each month in detail. For the sites the rain improves most, the Tonle Sap floating villages compared and Phnom Kulen explain when the water arrives, and for how the morning-first schedule fits a full stay, the three-day itinerary lays it out hour by hour.