"多雨"的英文翻译是"heavy rain"。
"Heavy"在英文中是形容词，意思是"重的"或"大量的"。"Rain"是名词，意思是"雨"。
例句：
It's going to be heavy rain all day today. (今天整天都将会下大雨。)
We had heavy rain last night, so the streets are flooded. (昨晚下了大雨，所以街道都淹了水。)
The forecast says there will be heavy rain tomorrow. (天气预报说明天将会下大雨。)