Historical weather data, all-time temperature records, and monthly climate averages for Arlington, WA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5 in Arlington runs cool and damp — historically, expect a high near 56° and a better-than-even chance of rain (58%). The date has swung from a balmy 64° in 2019 down to a hard freeze at 27° in 2015, so don't put the jacket away just yet.
Arlington's weather has real range: it's hit 103° in August and bottomed out at 7° on New Year's Day 1979. The wettest single day on record dumped over 3 inches of rain in November 2011, and a March snowstorm in 1989 piled on a full 10 inches.
Summer is the clear sweet spot — late July through early August brings average highs around 80°, while early January is the coldest stretch at just 44°. If you're trying to avoid rain, skip the last week of December, which averages 1.59 inches of precipitation — the wettest stretch of the year.