In October, Seattle typically sees daytime highs of 15.5°C and overnight lows around 7.6°C. Compared to the annual average high of 15.2°C, October runs +0.3°C.
October in Seattle averages a daytime high of 15.5°C and an overnight low of 7.6°C.
October runs +0.3°C compared to Seattle's annual average high of 15.2°C, ranking #6 of 12 months by warmth.
Plan for daytime highs near 15.5°C and cooler evenings around 7.6°C.