Cambodia can be visited throughout the year. However those planning to travel extensively by road should avoid the last two months of the rainy season when some countryside roads may be impassable.

The climate is tropical and distinguished by three major seasons.

• Dry Season: November - March 
  The most pleasant season is the dry season from November to March during which temperatures are cooler (averaging 20-28⁰C).
• Hot season: April - May Average temperatures are 30-35⁰C.
• Rainy season: June - October 
  Locally referred to as the "green season" during which temperatures are relatively cool (average 25-30⁰C). At this time of year it rarely rains in the morning. Instead, most precipitation comes in the afternoon and even then it’s only sporadic. Rainfall varies considerably from area to area. Whereas the seaward slopes of the south-west highlands (Kompong Som and Kampot provinces) receive more than 5,000 mm of rain per annum, the central lowlands average only about 1,400 mm.