The winning EuroMillions ticket was bought in South Ayrshire in March.
The winning lottery ticket, which was purchased in South Ayrshire, has not yet been claimed.
Funeral procession passes Partick Thistle's stadium before service attended by Nicola Sturgeon.
Mr Weir, who won £161m in the EuroMillions in 2011, died on Friday after a short illness.
Mr Weir and wife Chris, from Largs in North Ayrshire, claimed the £161m prize in July 2011.