In Thessaloniki buses will only operate from 8 a.m. to 9 p.m.
Mainline or suburban rail trains as well as ships will not move, but flights will not be affected.
Hospitals operate on skeleton staff as doctors are also on strike.
There are two main rallies planned for Saturday, as the General Confederation of Greek Labor (GSEE) and the Civil Servants’ Union (ADEDY) will hold their protest demonstration at Syntagma Square and Communist union PAME will meet at Omonia Square.
On Sunday evening they will all rally in front of Parliament while the new bailout agreement is debated and voted on.