Historical weather data, all-time temperature records, and monthly climate averages for Tumwater, WA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in Tumwater lands right in the swing of spring — historically, the day averages a high of 57° and a low of 36°, with rain more likely than not at a 62% chance of precipitation. The date has seen some wild swings over 84 years of records, from a balmy 76° back in 1966 to a sharp 25° low as recently as 2023.
Tumwater's weather has real range — the all-time high of 110° on June 28, 2021 was one of the most extreme heat events in Pacific Northwest history, while the other end of the thermometer bottomed out at -8° on New Year's Day 1979. When it comes to rain, a single January day in 2009 dumped nearly five inches (4.82"), and a January 1972 storm buried the area under 14.2" of snow.
Tumwater follows a classic Pacific Northwest pattern: mild and wet in winter, warm and dry in summer. July 16–22 is historically the warmest stretch of the year with average highs of 79°, while the first week of January is the coolest at just 44°. If you're trying to dodge the rain, avoid late November — that's the wettest week of the year, averaging 2.2" of precipitation.