data sydney 2024Source of data. Temperature, humidity and rainfall observations are from Sydney (Observatory Hill) {station 066214}. Pressure, cloud, evaporation and sunshine observations are fromSydney's 2025 population is now estimated at 5,248,790. In 1950, the population of Sydney was 1,689,940. Sydney has grown by 63,890 in the last year, which represents a 1.23% annual