Historical weather data, all-time temperature records, and monthly climate averages for Shoreline, WA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5 in Shoreline runs mild and damp — expect a high near 57° and a coin-flip chance of rain. The date has swung from a balmy 74° back in 2007 down to a chilly 33° low in 2021, so layer up just in case.
Shoreline's weather has real range hiding behind its mild reputation. The all-time high hit a jarring 107° on June 28, 2021 — the same brutal heat dome that pushed the all-time low's winter cousin, a 10° freeze in December 1990, into the record books. A single December day in 2007 dumped 4.15 inches of rain, and the area has seen 8 inches of snow fall in one shot.
Summer is the clear sweet spot, with late July through early August averaging highs of 77–79° and reliably low rainfall. If you're cold-averse, avoid mid-December, when highs hover around 46° and the wettest stretch of the year — late November — is just wrapping up. The shoulder seasons of May and September offer a solid middle ground, with highs in the mid-60s to low 70s.