Historical weather data, all-time temperature records, and monthly climate averages for Sedro-Woolley, WA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in Sedro-Woolley sits right in the middle of spring's slow warm-up, with a typical high of 56° and low of 39° drawn from 129 years of data. Rain is more likely than not today — a 58% chance — though snow essentially never happens on this date anymore. The biggest swing ever recorded on this date: a 71° high back in 1906 and a sharp 27° low as recently as 1999.
Sedro-Woolley has seen genuine extremes over its 130-year record, from a scorching 99° on June 30, 1915, to a brutal -2° on January 26, 1957. The wettest single day on record dumped 4.01 inches on November 18, 1911, which lines up perfectly with the area's reputation for soggy falls. Winter 2011 delivered the snowiest day on record — 13 inches on February 24 — a reminder that the Skagit Valley can still get buried.
Sedro-Woolley's warmest stretch runs from late July through mid-August, peaking around the week of August 6–12 with average highs of 77° — ideal for the area's farms and festivals. Winters are cool and gray but not brutal, with January highs averaging just 45°. If you're rain-averse, avoid mid-November, when the wettest week of the year averages 1.7 inches of precipitation.