Bulgaria's weather agency has issued a yellow warning for frost today in 24 regions.
In 15 of them, the warning covers the whole region: Vidin, Lovech, Pernik, Kyustendil, Sofia region, Sofia city, Pazardzhik, Plovdiv, Smolyan, Kardzhali, Haskovo, Stara Zagora, Gabrovo, Sliven and Yambol.
In Montana, Blagoevgrad, Vratsa, Pleven, Veliko Tarnovo, Dobrich, Targovishte, Razgrad and Shumen, it covers only part of the region.
The day will be mostly sunny, though the eastern half of the country will see more cloud at times, with light wind. Temperatures will reach 21 to 26 degrees Celsius, around 23 in Sofia.