for Ayr United on a one-year contract.
At the same time 35-year-old goalkeeper Eric Phillips has signed to provide short-term cover while Darren Johnson is unavailable.
To complete the trio former Ayr Youths centre-half Gerry Joyce has rejoined on a one-year deal.
19-year-old Weaver had trained with both Ayr and First Division Hamilton Academicals during the summer after being released by Blackburn.
Manager Robert Connor said: "The Ayr United fans will enjoy watching
a player of Paul's calibre in the months ahead.
"This is a new start for Paul and a chance to continue his career
progression to regular first-team football."