Pool season · Wisconsin
Milwaukee Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
This is the one-page view of Milwaukee's pool year: both model windows, the estimated water-temperature curve, and today's live position on the season bar. The detailed checklists live on the opening and closing guides; this page is the calendar you check between them.
The bar compresses Milwaukee's whole pool year into one lane rope: gray floats for the off-season, hollow teal for the May 6–May 27 opening window, solid teal for swim weeks, hollow amber for the closing stretch that ends October 2. Wherever the today marker sits, the nearest color change is your next appointment.
The Milwaukee pool calendar
Opening — target May 13
Open by May 13 — a two-week head start on the May 27 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline October 2
The window opens September 22 once water leaves the algae zone; the model deadline is October 2, a week ahead of the October 18 freeze normal.
Estimated water temperature by month
This is Milwaukee'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 24° | 22° | 31° | 41° | 53° | 63° | 72° | 72° | 68° | 57° | 44° | 32° |
The curve peaks near 73°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when Milwaukee hits the closing window
Data: NOAA 1991–2020 climate normals via Mt Mary College (3.2 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.