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SeaTac Precipitation Data

A set of graphs showing the accumulated Sea-Tac precipitation beginning October 1, for the current water year.

In addition to current-year data, the graph shows the historical daily mean, and the standard deviations of the daily mean per calendar day for the water year (October 1 - September 30).

Data in this graph is retrieved and compiled from the he NOAA National Weather Service Report for Sea-Tac.

SeaTac Precipitation Data for Water Year 2025

Three charts about precipitation at Seatac from 10-1-24 to 9-17-25. For most seasons and months so far in the 2025 water year, Seatac has received lower rates of precipitation than in the past two years. 2025 rates are near the lower standard deviation for the historical mean.
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