June in Newcastle averages a daily high of 18.2°C with nights around 10.6°C. Expect roughly 11 wet days totalling 129.2mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Newcastle is August–May.
Based on NEWCASTLE NOBBYS SIGNAL STATIO, AS (2.1km), 1995–2024. 28 years of June data.