Historical weather data, all-time temperature records, and monthly climate averages for Mountlake Terrace, WA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in Mountlake Terrace typically lands right in that transitional sweet spot — a 57° high, 41° low, and a coin-flip chance of rain. The date has swung pretty wide over 38 years, from a chilly 33° low in 2021 to a genuinely warm 74° high back in 2007.
Mountlake Terrace is a city of extremes hiding inside a mild reputation — it's hit 107° (June 2021) and plunged to 10° (December 1990) within the same four decades of records. A single December day in 2007 dropped 4.15 inches of rain, and the winter of 1990 buried the area under 8 inches of snow in one shot.
Summer is the clear star here: late July through early August averages a comfortable 79° high, with almost no rain to speak of. If you're rain-averse, avoid late November — that's the wettest stretch of the year, averaging 1.58 inches in a single week. Winters stay mild by most standards, but December highs only reach the mid-40s.