cancelled due to rain; rain cancellation
Used in announcements for events, sports, or outdoor activities that will be called off if it rains. Often seen on signs or in schedules.
Tomorrow's game may be cancelled due to rain.
This event will be cancelled in case of rain.
順延 means 'postponement' (often due to weather), while 雨天中止 specifically means cancellation because of rain, not just delay.
雨天決行 means 'held even if it rains', the opposite of 雨天中止.
Compound of 雨天 (rainy weather) and 中止 (cancellation).