Seattle Weather In March 2025. The climate in seattle during march can be summarized as cool and a little damp. In seattle during march average daily high temperatures increase from 53°f to 57°f and it is overcast or mostly cloudy about 66% of the time.

In seattle during march average daily high temperatures increase from 53°f to 57°f and it is overcast or mostly cloudy about 66% of the time. During the month of february,.