The temperature was recorded at noon in Capo Bellavista, on the east coast of the island.
According to the Italian news agency ANSA, the previous record for the month stood at 26°C in Sardinia.
Sardinian cities such as Cagliari and Olbia reached 22°C.
Many other parts of Italy basked in unseasonably warm weather on Monday, with Turin and Cuneo, in the northern region of Piedmont, also verging on 27°C.
“Daytime temperatures are largely above the seasonal average which, in February, is normally between 13°C and 15°C,” the air force weather service, quoted by ANSA, pointed out.
The warm weather was expected to last for a couple of days, before the country cools down on Wednesday.
