In March, Seattle typically sees daytime highs of 11.1°C and overnight lows around 3.4°C. Compared to the annual average high of 15.2°C, March runs -4.1°C.
March in Seattle averages a daytime high of 11.1°C and an overnight low of 3.4°C.
March runs -4.1°C compared to Seattle's annual average high of 15.2°C, ranking #8 of 12 months by warmth.
Plan for daytime highs near 11.1°C and cooler evenings around 3.4°C.