The National Institute of Meteorology and Hydrology forecast temperatures reaching 37-38 degrees Celsius in some areas of Bulgaria during the weekend. ^[1] The Bulgarian Mountain Rescue Service (PSS) to the Bulgarian Red Cross (BCHK) reported on September 5, 2026, that conditions in the mountains are sunny and calm, making them suitable for tourism. ^[2] Temperatures on Saturday morning were expected to range from 14 to 20 degrees at sunrise, rising to highs between 32 and 37 degrees during the day. ^[3] Temperatures in the mountains are around 10-15 degrees Celsius with light winds at the peaks on September 5, 2026. ^[4] The National Institute of Meteorology and Hydrology forecasted sunny weather for September 5, 2026, with maximum temperatures between 31 and 36 degrees Celsius, approximately 32 degrees in Sofia. ^[5] Sunday morning minimum temperatures were forecast to range from 15-17 degrees to around 22-23 degrees in some areas, resulting in tropical nights. ^[6] The heat was predicted to persist into Tuesday and Wednesday, particularly in the lowlands, with daytime temperatures ranging from 28 to 33 degrees. ^[7] No incidents were reported in the mountains over the past 24 hours according to BTA on September 5, 2026. ^[8]