Historical weather data, all-time temperature records, and monthly climate averages for Renton, WA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in Renton lands right in the heart of spring transition — expect a high around 59° and a low near 39°, though this date has seen everything from 76° in 1966 to a frigid 26° back in 1961. There's roughly a coin-flip chance of rain (46%), so keep a jacket handy, but snow is essentially off the table.
Renton's weather has real range: the all-time high of 106° during the infamous June 2021 heat dome stands in stark contrast to a bone-chilling -10° recorded in January 1950. That same brutal winter also produced the snowiest day on record — 11 inches on January 14, 1950 — while December 27, 1949 brought a drenching 6 inches of rain in a single day.
Renton is classic Pacific Northwest: mild and wet in winter, warm and dry in summer. The best weather arrives late July, when average highs peak around 80°, while January is the coolest stretch at just 45°. If you're trying to dodge rain, aim for July or August — December is the wettest stretch, averaging 1.6 inches in the final week of the year alone.