Dry, warm and sunny to start Friday.
Highest temperatures will occur early in the day reaching 20 to 24 degrees.
It will become cloudier as the day goes on and as winds veer westerly later it will turn much cooler and fresher.
There'll be a little patchy rain in the northern parts of the county.
Becoming mostly dry on Friday night with clear spells developing. Lowest temperatures of 8 to 11 degrees in a light northwesterly wind.
Subscribe or register today to discover more from DonegalLive.ie
Buy the e-paper of the Donegal Democrat, Donegal People's Press, Donegal Post and Inish Times here for instant access to Donegal's premier news titles.
Keep up with the latest news from Donegal with our daily newsletter featuring the most important stories of the day delivered to your inbox every evening at 5pm.