The warning for Clare, Kerry, Galway, and Mayo will be in place from 8pm tonight until 8pm tomorrow evening.
The rain, which might turn heavy, could cause localised flooding, difficult travel conditions and poor visibility in these areas.
Meanwhile, it will be mostly dry this morning, bringing crisp sunshine and some well-scattered showers, with most of those “hugging the Atlantic seaboard”, Met Éireann has said.
The day will gradually become cloudier, with patchy rain and drizzle developing over the western half of the country in the afternoon, and turning heavier in the evening.
Many eastern and southeastern areas will remain dry until after dark, with temperatures reaching 9 and 13C in the afternoon.
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However, it will be wet and blustery tonight, as rain will extend to the east, bringing localised flooding across western counties.
It will also be misty in some places, and the rain will turn more scattered later at night. Temperatures are set to drop to 7 and 11C, with fresh to strong winds expected.
Tomorrow will start dull and blustery, with further spells of rain, which will be the heaviest across the western half of the country.
Stock photo: AP Photo/Michael Probst
Today’s News in 90 Seconds – Sunday November 2
But Monday will be humid and relatively mild, with the highest temperatures at 13 and 16C, with fresh to strong winds dominating.
Wet and blustery weather will continue into Monday night, especially across southern and eastern counties, bringing localised flooding.
Tomorrow night will be a very mild one, with temperatures dropping to 11 and 13C, and fresh and gusty winds.
Met Éireann meteorologist Siobhán Ryan said: “It’s a very unsettled outlook, with frequent spells of wet and blustery weather, but a very mild one overall too, and frost-free.”