Originally Posted by
HereAndThereSC
Montreal can get quite cold in september, but doubtful you'd ever snow.
It depends on your definition of cold, and your tolerance.
I find the first half of October quite pleasant. The fall foliage is at it's peak, and the days are typically dry and clear. Expect temperatures anywhere from 5 to 15 celsius and right around the freezing point at night.
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13F