Sunja is a village and a municipality in the Sisak-Moslavina County of Croatia. Since records began in 1981, the highest temperature recor…Sunja is a village and a municipality in the Sisak-Moslavina County of Croatia. Since records began in 1981, the highest temperature recorded at the local weather station was 40.2 °C, on 18 July 2007. The coldest temperature was −26.5 °C, on 12 January 1985.