Wet season in Cambodia
Cambodia's wet season comes courtesy of the southwest monsoon, which blows from May to October, bringing with it some three-quarters of Cambodia's annual rainfall. Not surprisingly, wet season is characterised by rain, and during the peak of wet season from July to September it can rain every day. Rainy days however tend to have a few hours of heavy rain rather than being all-day downpours, though the latter do sometimes occur -- you will get wet travelling in a Cambodian wet season.
Aside from getting drenched, the main disadvantage of travelling in wet season in Cambodia relates to flooding and degraded road conditions. The bulk of roads in Cambodia are dirt and in wet season they turn to heavily rutted and pot-holed mud pits. Travelling in rural areas, particularly the north and northeast of the country, can be slowed considerably. You will still be able to go just about anywhere, it will just take longer.
A secondary problem are bridges being out, but this is becoming less of an issue as the quality of bridgework is improving. Cambodia's arterial routes -- namely Phnom Penh to Siem Reap, Phnom Penh to Battambang and Phnom Penh to Sihanoukville -- are all-weather, sealed affairs and far less of a problem than the unsealed roads.
On the upside, monsoonal Cambodia can be a beautiful country to travel in. The dust is all gone -- turned to mud unfortunately -- and the lush greenery of the country returns. Angkor Wat in particular can be stunning in wet season -- the birdlife is far more obvious and the ruins have a special appearance and feel. Observing Angkor Wat with a lightning storm as a backdrop is an electrifying experience (couldn't resist!). Far fewer travellers are in-country, too, so if you prefer to dodge the crowds, the monsoon can be a good time to visit.
Regionally, the Cardamom mountains get the heaviest rain in the country, while the entire coastline gets rough seas and a lot of rain.
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