Visited in the morning of Sept 4th. It was very hot. The location was easy to get to with the signs directing you to the location. If you take the metro you have to walk 5 mins uphill. My favorites were the Japanese and Chinese gardens. They had decorations that were very vibrant and went well with the surroundings.
If you are visiting Montreal for the first time I suggest you get the MTL pass on tripadvisor or viator. This pass will save you money and you will have access to various sites.