Cambodia is a tropical country, meaning it is warm all year, but there are still 3 distinct seasons:
Dry season: November-February
The best time to visit, with temperatures in the mid to high 20's celsius (but be prepared for the occasional chillier night). It is also the most popular season, and the most expensive - Christmas and New Year, particularly.
Hot season: March-May
Humidity and temperatures rise steadily, peaking in the mid 30's in Phnom Penh, which makes the middle of the day an uncomfortable time for doing anything active. Be prepared for lots of dust, too, which all turns to mud in...
Rainy season: June-October
The southwest monsoon from the Gulf of Thailand drenches the whole of Cambodia. Dirt roads can become impassable and some areas flood, especially in September-October. But in Angkor the mornings are usually dry and you can have the temples to yourself, if you don't mind holing up in the afternoon, and being flexible on overland travel (or just using flights).
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There are no direct flights from Europe, America or Australasia, so you'll have to fly into a regional hub (e.g. Bangkok or Kuala Lumpur) and take a connecting flight. Carriers include: Thai Airways, Bangkok Air, Silk Air, Jetstar, Vietnam Airlines, Malaysia Airlines and Dragonair.
DOMESTIC FLIGHTS: Cambodia Angkor Air operate between Siem Reap and Phnom Penh. No other internal flights are currently available.
AIRPORT TRANSFERS: You can arrange transfers with your hotel. Buses do not operate at Cambodia’s airports. You might find a waiting taxi or tuk-tuk, but they may overcharge.
TUK-TUK AND MOTO: In the towns and cities tuk-tuks are the way to get about. Motos (small motorbikes) will whisk you up the road, but won’t give you a helmet. Always agree the price before setting off.
BY BICYCLE: Hire bikes - they’re everywhere and a great way to get about, especially in Siem Reap and Angkor.
BY BUS: Buses run between the big cities; they are cheap, but not that comfortable and don’t get anywhere quickly, although they do show you the countryside and its towns.
BY BOAT: This is a common way of getting around, especially in the wet season when some roads flood. If you have time, consider one of the slower boat cruises (2-3 days) between Phnom Penh and Siem Reap. We recommend a cruise on Toum Tiou or Toum Tiou II, operated by Compagnie Fluviale du Mekong. If you want to cruise in style along the Mekong and Tonle waterways in a replica of a colonial river steamer, offering luxurious cabins and smart-casual dining, try Pandaw.