Historical weather data, all-time temperature records, and monthly climate averages for Monroe, WA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4 in Monroe runs mild but wet — historically, there's a 59% chance of rain, with average temps landing between 38° and 57°. The date has seen wild swings though: a balmy 77° back in 1966, and a bitter 27° low in 1933.
Monroe's weather has real range. The thermometer has climbed as high as 102° (July 29, 2009) and bottomed out at -3° (January 18, 1950), and a single February day in 1984 dumped 6.39 inches of rain. This is the Skykomish Valley — it doesn't do things halfway.
Monroe's sweet spot runs from late July through August, when highs hover around 76–78°. If you're avoiding rain, skip November — the week of the 12th averages nearly 1.75 inches of precipitation. January and December are the coolest months, with average highs only reaching the mid-40s.