CLIMATE: AVERAGE MONTHLY WEATHER IN Bucharest, Romania. Bucharest has a humid continental climate. Winters can get windy and temperatures often dip below 0 °Celsius (32 °Fahrenheit), sometimes even dropping to minus 20 °C (4 °F). In summer (July and August), the average temperature is around 23 °C (73 °F). Temperatures often reach 35 °C (95 °F) to 40 °C (104 °F) in mid-summer.