Phnom Penh in May

November through March brings the sweet spot - dry weather and temperatures that won't melt you. Expect highs around 85°F instead of the brutal 95°F+ from April to October. December and January see the most tourists, so book accommodation early and expect higher prices. February and March offer the best balance: good weather, fewer crowds, and reasonable rates. The rainy season (May-October) isn't terrible if you don't mind afternoon downpours. Hotels drop prices by 30-40%, and the city looks greener. But some rural day trips become impossible due to flooded roads. April is hell - hot, humid, and dusty before the rains start. Locals call it the suicide month for good reason.