Pool season · Wisconsin
Sheboygan Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
One bar, one year, one Sheboygan pool. The season bar below draws everything the model knows — opening window, prime season, closing window — against today's date, with the working details one click away on the opening and closing pages.
Each dot on the bar is one week of Sheboygan's typical year, colored by what the model says that week is for: gray weeks are off-season, hollow teal marks the opening window (May 15–June 5), solid teal is swim season, and hollow amber is the closing window ending October 2. The black marker is today — its position against the colors is the entire executive summary.
The Sheboygan pool calendar
Opening — target May 22
Target May 22; the practical window runs May 15–June 5, and the 7-day mean crosses the 61°F threshold around June 5. Cold-water starts are the cheap ones.
Closing — deadline October 2
Hold the cover until September 22, then winterize by October 2, a week ahead of the October 23 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
This is Sheboygan's typical-year water curve: the same EWMA model as the live widget, run on the 1991–2020 normals instead of this week's weather.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 25° | 23° | 30° | 39° | 50° | 60° | 70° | 72° | 68° | 57° | 44° | 33° |
The curve peaks near 72°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when Sheboygan hits the closing window
Data: NOAA 1991–2020 climate normals via Sheboygan (1.0 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.