Montreal weather is certainly unpredictable at times. I mean.remember when it snowed in mid-April? How could you forget? Well, it seems as if there's going to be yet another heavy swing in temperature in the 514. Despite hot and humid days paying Montreal a visit this week, it seems as if the heat isn't planning on staying around for too long. The Weather Network is calling for some sunny and rainy days ahead, but the temperatures will have it feeling like it's July in Montreal.