Pool season · Wisconsin
Eau Claire Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
Eau Claire'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 Eau Claire's swim season; the hollow teal run before it (April 30 to May 21) is when to open; the hollow amber run after is when to close, with September 27 as the deadline; gray is the covered season. Today's marker shows where you stand in that cycle right now.
The Eau Claire pool calendar
Opening — target May 7
Target May 7; the practical window runs April 30–May 21, and the 7-day mean crosses the 61°F threshold around May 21. Cold-water starts are the cheap ones.
Closing — deadline September 27
Hold the cover until September 17, then winterize by September 27, a week ahead of the October 14 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
Monthly averages of the site's water model run on Eau Claire'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 18° | 17° | 27° | 40° | 53° | 65° | 71° | 72° | 66° | 56° | 41° | 28° |
The curve peaks near 73°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when Eau Claire hits the closing window
Data: NOAA 1991–2020 climate normals via Eau Claire 3sw (2.4 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.