The best months to visit Heard Island and McDonald Islands are February and January. See monthly temperatures, rainfall and rain days (1991–2020 averages) to plan your trip.
Average daytime high and monthly rainfall in Heard Island and McDonald Islands: January -11°C / 103mm; February -10°C / 105mm; March -11°C / 128mm; April -11°C / 127mm; May -13°C / 138mm; June -13°C / 130mm; July -15°C / 132mm; August -14°C / 137mm; September -14°C / 123mm; October -15°C / 109mm; November -12°C / 97mm; December -12°C / 97mm.