The Met Office issues a yellow warning for rain from midnight until noon on Saturday.
As well as the rain there will be some unseasonably strong winds with gusts up to 55km/h Heavy and persistent rain could bring flooding and disruption to parts of Northern Ireland on Friday night.
The organisation said Belfast and parts of County Down could get up to 60mm of rain, with as much as 30mm falling in just a few hours. The heaviest and most persistent rain is expected through the early hours of Saturday morning before gradually improving later in the morning.
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