also: あまつづき
noun
long spell of rain; prolonged rainy weather
Describes a period of many consecutive rainy days. Often used when the rain feels unusually persistent.
今年の梅雨は雨続きで、洗濯物が乾かない。
This year's rainy season has been a long spell of rain, and the laundry won't dry.
雨続きのせいで、外に出る気
Because of the prolonged rain, I don't feel like going outside.
長雨 also means a long period of rain, but is more neutral and can refer to any extended rain, while 雨続き emphasizes the consecutive, unbroken nature of the rainy days.
Compound of 雨 (rain) and 続き (continuation, from 続く 'to continue'). The reading あめつづき is standard; あまつづき is a less common variant.