weather in nova scotia canada in june
1 The average temperature in Halifax, Nova Scotia in June is mild at 14.5 Â°C (58.1 Â°F). 2  Afternoons can be somewhat warm with average high temperatures reaching 19 Â°C (66.2 Â°F).  Overnight temperatures are generally quite mild with an average low of 10 Â°C (50 Â°F).