Today.

Darren Joyce, of iWeatherOnline.com, writes:

You may notice it is rather mild if not warm today, particularly along the east coast where it is 17c. The source of this warm weather is the Canary Islands where winds over Ireland today have originated. The arrow-making staff of our graphics department have been hard at work for hours, as you can see.

Ireland enjoys unseasonably warm temperatures (iWeatherOnline.com)