Historical weather data, all-time temperature records, and monthly climate averages for Keizer, OR. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5 in Keizer sits right in that classic spring-in-limbo zone — expect a high around 59° and a low near 38°, with a coin-flip chance of rain at 56%. The date's range tells the whole story: it's hit 77° as recently as 1952 and dipped to a brutal 26° back in 1975.
Keizer's weather has a serious wild side. The all-time high of 117° on June 28, 2021 — part of the historic Pacific Northwest heat dome — stands as one of the most extreme heat events ever recorded in the region, while the -12° low from December 1972 shows winters here can occasionally turn vicious.
Keizer runs warm and dry from July through September, with peak highs hitting 82°-84° in late July — ideal if you're after sunshine. The rainy season sets in hard by late December, averaging 1.8 inches in the final week of the year alone, and the cool season stretches from November through March with highs stuck in the mid-40s to low 50s.