Fish Rain” In Thailand Fishes Gets Litters All Over the Streets After Rainfall in Thailand, amid surprise of passersby hundreds of fishes had flown to the banks of seashore and on the road. Most of fishes found dead. It appeared as if Thailand received a Fish rain. Some passersby try to save fish. The rainy season in Thailand varies from region to region. Very broadly speaking, Thailand’s rainy season can be classified as May/June to October. The river fishing season in Khao Sok National Park is influenced by the monsoon winds from both the Indian and Pacific Ocean.