January in Sydney averages a daily high of -0.6°C with nights around -8.7°C. Expect roughly 19.3 wet days totalling 148.1mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Sydney is July–September.
Based on SYDNEY A, NS CA (10.8km), 1995–2024. 20 years of January data.