Parts of the north could be impacted by local flooding with a yellow warning for rain issued for Wednesday.
The Met Office warning will be in place from 2am until 9pm, with areas in the east mostly impacted.
It comes after the recent spell of dry and sunny weather, with temperatures last week reaching above 20 degrees for the first time this year.
More: Northern Ireland records hottest day of the year as weekend approaches
It was the earliest temperatures had been recorded above the 20-degree mark since 2012.
The dry spell made conditions more difficult for firefighters across the north as they battled a number of gorse fires in recent weeks.
However, temperatures have dropped as the area of high pressure shifted away over the weekend.
The Met Office has advised that persistent and, at times, heavy rain on Wednesday could cause some travel disruption and potential for local flooding.
“Rain will develop through the early hours of Wednesday, heavy at times, and lasting for much of the day,” a spokesperson said.
“Most areas within the warning will see 20-30 mm of rain, but a few spots could see 50-60 mm particularly over the high ground of Antrim and Down.
“Rain will ease from the west Wednesday evening.”
The warning is in place for counties Antrim, Armagh and Down as well as parts of Derry and Tyrone.
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