The 700 restaurants will offer table service only and will also require diners to leave their contact details by scanning a QR code or visiting a web page.
The ordering process remains largely unchanged at the fast food giant with customers able to order directly via the My McDonald’s app, at the till or touchscreen kiosk.
Safety measures include social distancing, careful management of customer numbers, regular cleaning of contact points including ordering points and card machines and hand sanitiser offered upon entry to restaurants.
In line with current restrictions, McDonald’s has not opened any of its Welsh restaurants for eat-in.
The re-openings follow a trial in four restaurant sites and come nearly two months after McDonald’s re-opened its delivery and drive-thru services.
McDonald’s says it is planning to take part in the Government’s Eat Out To Help Out Scheme, which will offer 50% off eat-in bills up to a maximum of £10 per head on Mondays, Tuesdays and Wednesdays in August.
The fast food operator has also lowered some of its prices following VAT being reduced from 20% to 5% for the hospitality and tourism sectors on 15 July.