In January, Seattle typically sees daytime highs of 6.9°C and overnight lows around 1.8°C. Compared to the annual average high of 15.2°C, January runs -8.3°C.
January in Seattle averages a daytime high of 6.9°C and an overnight low of 1.8°C.
January runs -8.3°C compared to Seattle's annual average high of 15.2°C, ranking #12 of 12 months by warmth.
Plan for daytime highs near 6.9°C and cooler evenings around 1.8°C.