Met Eireann has issued a yellow weather warning for counties Galway, Mayo, Clare, Kerry, and Limerick, due to heavy rain expected.
Rainfall levels between 25-40mm could cause spot or local flooding in these counties, and may dampen the efforts of some trick or treaters today.
Motorists are advised to exercise caution on the roads, due to these wet conditions. The warning will remain in place until 6pm this Halloween evening.