In October, Markham typically sees daytime highs of 13.6°C and overnight lows around 4.1°C. Compared to the annual average high of 11.6°C, October runs +2.0°C.
October in Markham averages a daytime high of 13.6°C and an overnight low of 4.1°C.
October runs +2.0°C compared to Markham's annual average high of 11.6°C, ranking #6 of 12 months by warmth.
Plan for daytime highs near 13.6°C and cooler evenings around 4.1°C.