Historical weather data, all-time temperature records, and monthly climate averages for Lynnwood, WA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in Lynnwood lands right in the thick of spring uncertainty — expect a coin-flip chance of rain with highs averaging around 54°. The date has seen everything from a balmy 69° back in 2007 to a freezing 32° low in 1948, so pack accordingly.
Lynnwood's weather has real range when it wants to. The all-time high hit a sweltering 100° on June 28, 2021 — a brutal Pacific Northwest heat dome moment — while the coldest day on record bottomed out at 3° back in January 1950, just two days after the city's snowiest single day ever dropped 6.8 inches.
Summer is the sweet spot here: highs climb to the low-to-mid 70s from July through August, peaking during the week of August 13–19 at an average 75°. Winter stays mild but grey, with January highs averaging just 44° and the wettest stretch of the year arriving in mid-to-late November. If you're chasing dry skies, July and August are your best bet.