The onset of the rainy season is also the onset of slow season in Cambodia. The rains can make travelling about miserable, so it probably isn't the best time to visit. The rains ease up in October, usually, maybe November and the inrush begins again.
Rainy season doesn't just turn on one morning. We kind of ease into it. Today was a beautiful day, and I took the motorbike into town to get needed supplies (cabbage and Irish whiskey if you must know).
This is one of the normally busy streets at about 0830. The khmer start mornings early, and perhaps the backpackers are all still sleeping in, but I don't think so. Along this street you can buy welding gas, bread, cell phones, some packaged junk food, get your hair done, and a bit further down is the main bank, Acleda.
The shop ('Hang' in khmer) on the right is across the street from where we live. This is where I buy 20 litre jugs of drinking water and Anchor (pronounced "an chore" so as not to confuse it with "Ankor" beer).