The rainy season starts in late May or early June. It seems to be starting a little later each year now. But it’s in full force already this year.
This is Street 53BT where I live in Phnom Penh. We occasionally get some water pooled up but today we had a prolonged heavy downpour and this water will be with us for a day or so. It was deep enough that my pedals were going in the water as I rode my bicycle through the flood.