Pool season · Oregon
Portland Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
Portland's whole pool calendar, condensed: when the water warms, when it cools, and where today falls between those edges. Use the opening guide and closing guide for the step-by-step work; keep this page for the dates.
Reading it takes ten seconds: 52 dots, one per week. Solid teal is Portland's swim season; the hollow teal run before it (May 11 to June 1) is when to open; the hollow amber run after is when to close, with October 10 as the deadline; gray is the covered season. Today's marker shows where you stand in that cycle right now.
The Portland pool calendar
Opening — target May 18
Open by May 18 — a two-week head start on the June 1 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline October 10
Hold the cover until September 30, then winterize by October 10, a week ahead of the December 1 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
Monthly averages of the site's water model run on Portland's own normals — the shape of a typical year, not a forecast. The widget above shows where the current year actually sits.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 41° | 43° | 47° | 50° | 56° | 61° | 66° | 70° | 68° | 60° | 51° | 44° |
The curve peaks near 70°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when Portland hits the closing window
Data: NOAA 1991–2020 climate normals via Portland Kgw-tv (2.3 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.