Antique items for example Buddha images and other old artifacts are prohibited to be taken out of Cambodia. If you have already traveled from neighboring countries, you are advised to declare you belongings to the customs to avoid any problems when leaving Cambodia.
It is prohibited for any visitor to bring into Lao the followings:
Cambodia, in almost all year, full of sunshine and winds and has a high average temperature. Dominated by monsoon cycle, the climate is tropical and distinguished three major seasons. The dry season from November to April. The hot season lasts from March to June (average temperatures 28-35C). The rainy season (or monsoon) lasts from May to October with southwesterly winds ushering in the clouds that bring seventy five to eighty percent of the annual rainfall often in spectacular intense bursts for an hour at a time with fantastic lightening displays.
Cool and dry season
This season, from November to February, would be the most pleasant season for visitors, with temperatures are cooler (average temperatures 20 – 25C). December and January offering the very best weather of the year across the country - comfortably warm days, clear skies, no rain, light breeze, cool evenings. A comfortable time of year to visit the temples near Siem Reap.
Hot and dry season from March to May
During these months river and lake levels are very low, generally making boat/river ferry travel much less reliable and can greatly increase travels times. On the other hand, road travel (bus, taxi, motorcycle) is much easier and more reliable for lack of rainy season flooding. The temperature slowly rises through February and March, peaking out in April and May (upper 30oC) before the monsoons begins.
Hot and wet season from June-August
Across most of the country, the monsoon rains are fairly predictable, usually occurring in the afternoon or at night butt no more than a couple of hours. In fact, the Angkor temples are at their best aesthetics during the wet season. Boat travel becomes easier and more reliable as the river and lake levels rise, but as the wet season progresses, some roads sometimes deteriorate or become inundated.
Cool and wet season from September-October
In September the temperatures is in the mid 30oC and slowly drop through the following months. By October, the mid day temperatures are around 28oC. In September the rainy season is just passing its peak. The rains are still very regular and intense, but by October the frequency is usually dropping off considerably. By the end of October the rains are close to stopping completely. As the rains end through October, the best time of year to visit Cambodia begins.
Although vaccination is not official required, it is recommended that traveler should check with their doctor or a travel immunization clinic to get advice or vaccination regarding protection against for cholera, typhoid, tetanus, and hepatitis A and B if you are going to the provinces. Any essential medications should be brought with you as there is no guarantee they will be available in Cambodia. Use an insect repellent against mosquitoes. It is the only way to be sure of protection against mosquito borne diseases.