Monsoon by Country

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Cambodia

Month Monsoon Description
January First period of the dry season is the least hot of the year.
February Second period of dry season, from mid-February to May, before the monsoon arrives, is the hottest of the year
March Second period of dry season, from mid-February to May, before the monsoon arrives, is the hottest of the year
April Second period of dry season. Hottest months are April and May. The heat becomes oppressive;
May Second period of dry season. Hottest months are April and May. The heat becomes oppressive; Rainy season from May to mid-November due to the south-west monsoon
June Rainy season from May to mid-November due to the south-west monsoon. In the rainy season, the temperature is a bit lower, but the humidity is higher, so the weather is hot and muggy.
July Rainy season from May to mid-November due to the south-west monsoon. In the rainy season, the temperature is a bit lower, but the humidity is higher, so the weather is hot and muggy.
August Rainy season from May to mid-November due to the south-west monsoon. In the rainy season, the temperature is a bit lower, but the humidity is higher, so the weather is hot and muggy.
September Rainy season from May to mid-November due to the south-west monsoon. In the rainy season, the temperature is a bit lower, but the humidity is higher, so the weather is hot and muggy.
October Rainy season from May to mid-November due to the south-west monsoon
November Rainy season ends in mid-November. The monsoon withdraws in early November in the north and between the middle and the end of the month in the center-south.
December First period of the dry season is the least hot of the year. Coolest month

Festivals & events

Khmer New Year Closures
Apr

Three-day new year (mid-April). Cities empty as locals head home; many shops and services close.

Royal Ploughing Ceremony Celebration
May · approximate dates

Ancient royal rite in Phnom Penh marking the start of the planting season. Usually May.

Pchum Ben (Ancestors' Day) Closures
Sep–Oct · approximate dates

Fifteen days honouring ancestors; Phnom Penh empties as people return to home provinces. Lunar dates, Sep–Oct.

The 15 waning-moon days of the Khmer month of Photrobot (the 10th), ending on the new moon of late September or October; the last three are public holidays.
Next date: 26 Sep – 10 Oct 2026 (approx., may be a day off)

Bon Om Touk (Water Festival) Book ahead
Nov · approximate dates

Boat races on the Tonlé Sap draw huge crowds to Phnom Penh. Lunar dates, usually November.

Three days around the full moon of the Khmer month of Kadeuk (the 12th), between late October and late November.
Next date: 23–25 Nov 2026 (approx., may be a day off)