A yellow rainfall warning has been issued for Donegal, Galway, Leitrim, Mayo and Sligo, with a spell of heavy rain forecast and thunderstorms also possible.
The warning will come into effect at 9pm on Friday 11 September and remain in place until 9am on Saturday 12 September.
Met Éireann has warned of potential localised flooding, difficult travelling conditions and lightning damage during the period.
Southwest
A separate yellow rainfall warning has also been issued for Cork and Kerry.
Persistent rain, turning heavy at times, is forecast in the two counties, with the warning coming into effect at 9am on Saturday 12 September and remaining in place until 9pm Saturday evening.
Potential impacts include localised flooding and difficult travelling conditions, while outdoor events may also be affected.
Both warnings were issued by Met Éireann on Friday morning.
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