Met Office provisional data says country had 204.6 hours of sunshine, beating record set in 1942.
The Met Office has issued a yellow warning for rain for southern areas on Thursday and Friday.
There were 15 flood alerts in place, with much of the country experiencing heavy rain.
It comes as a yellow warning for snow and ice remains in place across much of Scotland.
Warning of 'significant disruption' to transport while 'frequent lighting strikes' may interrupt power supplies.
Various yellow weather warnings for wind, rain and snow have been put in place from Saturday until Tuesday.
Major road closed as ferry sailings cancelled and electricity firms on standby.
Forecasters took the provisional measurement at Achfary in the Highlands on Saturday.