A yellow warning for heavy rain is in force in north-east Bulgaria on Tuesday, with 30–35 litres of rain per square metre expected.
The Black Sea coast will be cloudy and windy, with thunder in places. Highs will be 12 to 14 degrees, and 12 in Varna.
Rain will spread to northern Bulgaria in the afternoon. Highs across Bulgaria will range from 9 to 17 degrees, with around 11 in Sofia and 15 in Plovdiv.
The mountains are not suitable for hiking, with moderate to strong wind and rain. The rain will hit the mountains in eastern Bulgaria first, then the western and central Balkan Mountains later in the day. Snow will fall on higher ground, with temperatures between -2 and 6 degrees.
On Wednesday, showers are expected in north-west and northern Bulgaria. On Thursday, rain will fall in the north and east, and the wind will pick up.
The rest of the week will be mostly cloudy, with showers and highs mostly between 11 and 16 degrees.
It will turn colder from Saturday, with heavier rain.