Areas of high ground exposed to the south and south west will be most affected, with the potential for a further 40-60 mm downpour over hills.
The Capital and the surrounding areas can expect heavy rain later on in the evening however, Edinburgh could miss much of the storm.
Along with a spell of heavy rain and high tides there is a risk of coastal flooding and damage. Maximum temperatures of 12 to 16 degrees in strong to gale force southerly winds.
It looks like heavy winds are already hitting the coast in Dublin as one user on Twitter has posted a video showing winds reaching up to 60km/h in the early hours of the morning.
Storm Callum will continue to batter the United Kingdom today, with the weather system expected to cause further disruption across the country. The alerts mean flooding is possible rather than expected, with high river levels and standing water on roads likely.
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The Environment Agency has issued flood warnings for parts of the Dorset coast, as well as 58 flood alerts across England, while Natural Resources Wales has 28 flood warnings and 39 flood alerts in place.
A bus replacement service will operate between Llandudno Junction and Blaenau Ffestiniog and between Machynlleth and both Newtown and Pwllheli. Also ferry and air travel, also trees down on some roads and restrictions on bridges.
The latest updated weather warning includes a description of winds for the north-east of the country that say gusts will likely stay between 100 and 130km/h up until 4pm.
An amber rain warning for Wales in place until 6pm warned of danger to life from fast-flowing, deep floodwater, power cuts, and possibly some communities being cut off. SE Britain will miss the worst of the weather although the rainband will finally clear eastwards during Sunday.