Pool season · Ohio
Cincinnati Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
This is the one-page view of Cincinnati'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.
Reading it takes ten seconds: 52 dots, one per week. Solid teal is Cincinnati's swim season; the hollow teal run before it (April 15 to May 6) is when to open; the hollow amber run after is when to close, with October 13 as the deadline; gray is the covered season. Today's marker shows where you stand in that cycle right now.
The Cincinnati pool calendar
Opening — target April 22
Target April 22; the practical window runs April 15–May 6, and the 7-day mean crosses the 61°F threshold around May 6. Cold-water starts are the cheap ones.
Closing — deadline October 13
The window opens October 3 once water leaves the algae zone; the model deadline is October 13, a week ahead of the October 25 freeze normal.
Estimated water temperature by month
Monthly averages of the site's water model run on Cincinnati'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 34° | 33° | 40° | 50° | 60° | 69° | 75° | 76° | 72° | 62° | 50° | 40° |
The curve peaks near 76°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when Cincinnati hits the closing window
Data: NOAA 1991–2020 climate normals via Cincinnati Lunken Airport (5.3 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.