The weather this week will be unstable and precipitation is forecast for every day. The head of the State Hydrometeorology Service Ilie Boian has told Info-Prim Neo that there will be rain in most parts of the country in the afternoon and the evening, starting with May 15. The weather conditions are determined by cyclonal masses that are unstable in character. They will cause showers in the warmest period of the day, which will be accompanied by thunder and lightning. Ilie Boian said that if conditions for hail appear, more announcements will be made. The rainy weather will last until next Monday. Daytime temperatures during May 14-21 will oscillate between 22 and 24 degrees Celsius, while nighttime temperatures – between 10 and 13 degrees Celsius.