The temperature hit 31.9C in Glasgow, which weather forecasters round up to 32C. Thursday beat Wednesday's record as Scotland's hottest day in 23 years.
Temperatures triggered speed restrictions on rail routes in central Scotland and roads melted in Aberdeenshire, Moray and Fife.
The "weatherproof" membrane on Glasgow Science Centre's roof melted and dripped black "goo" down the building.
Thursday has become Scotland's warmest day of 2018 so far.
Forecasters thought the day's temperatures might get close to Scotland's record highest June temperature of 32.2 recorded in Ochertyre in Perth and Kinross in 1893.
While the heat did get close, the record still stands.
The high temperatures caused problems across the country.
'Black goo'
Sharon Lyons from Glasgow Science Centre said: "As Scotland enjoys 'taps aff' weather, the weatherproof membrane from our roof is quite literally melting.
"The structural integrity of the roof is completely sound, but we are left with a bit of an unsightly black goo on the roof.
"When we return to typical Glasgow colder climes, we shall set about cleaning it."
Gritters were sent out after roads were reported to be melting in high temperatures.
Poor conditions were encountered on the A920 between Huntly and Dufftown and on the A916 Craigrothie to Cupar road.
On Wednesday, Aviemore reached 31C, making it the hottest single day in five years before the record was surpassed 24 hours later.
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Train services between Glasgow Central and Lanark faced disruption for most of Thursday, the morning after major signalling problems caused issues on commuter routes.
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BBC News
https://www.bbc.com/news/uk-scotland-44635107
