If you’re looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in North Sydney: The hottest months are usually August and July, with an average temperature of 16°C, while the coldest months are February and January, with an average of -2°C. The snowiest months in North Sydney are February, March, April and January, with each month seeing an average of 263 cm of snowfall.