Pool season · Michigan
Rochester Hills Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
This is the one-page view of Rochester Hills'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.
Each dot on the bar is one week of Rochester Hills's typical year, colored by what the model says that week is for: gray weeks are off-season, hollow teal marks the opening window (April 30–May 21), solid teal is swim season, and hollow amber is the closing window ending October 3. The black marker is today — its position against the colors is the entire executive summary.
The Rochester Hills 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 October 3
The window opens September 23 once water leaves the algae zone; the model deadline is October 3, a week ahead of the October 22 freeze normal.
Estimated water temperature by month
Monthly averages of the site's water model run on Rochester Hills'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 27° | 24° | 31° | 42° | 54° | 65° | 71° | 72° | 68° | 58° | 45° | 35° |
The curve peaks near 73°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when Rochester Hills hits the closing window
Data: NOAA 1991–2020 climate normals via Pontiac Wwtp (5.3 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.