What I would do is see what the average temperature is in Ontario in October. I don't think you're dumb at all. I'm having my wedding on the beach in March in South Carolina. Although it's still winter, the weather channel website said the average temp in South Carolina that time of the year is 68. So we shall see. Hope it's warm and sunny on your day. Goodluck to you and your FI. Congrats on your upcoming wedding.