Highest temperatures will be between 15 to 19 degrees
Met Éireann has issued a status yellow warning for Donegal, Galway, Mayo, Sligo, Clare and Kerry.
Southerly winds will reach average speeds of 50 to 65km/h, strongest along western and northwestern coasts.
The warning is valid from 11am this morning to midnight.
Meanwhile, a dry start can be expected in most places, with sunny spells and just the odd shower, and it will stay mostly dry in midland and eastern counties through the day.
However, scattered outbreaks of rain and drizzle will develop in western coastal counties and along parts of the south coast, with some more persistent rain following into western areas later this afternoon and evening.
Highest temperatures will be between 15 to 18 or possibly 19 degrees in a few eastern areas.
Tonight will be very mild and humid. It will be still rather windy for a time, with persistent rain in western areas, but rain will be well scattered in midland and eastern areas with dry periods at times.
There will be overnight lows of 13 to 15 degrees, with fresh to strong southerly winds, moderating overnight.
Information thanks to Met Éireann