Planning for the weather is a good way to make your trip to Coal Harbour relaxing and enjoyable, especially when you're splurging. The hottest months are usually August and July, with an average temperature of 13°C, while the coldest months are February and December, with an average of 4°C. The rainiest months in Coal Harbour are November, January, October and December, with each month seeing an average of 367 mm of rainfall.