Pool season · Ohio
Cleveland Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
Cleveland'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.
Cleveland, OH — 44 swim days a yearReading it takes ten seconds: 52 dots, one per week. Solid teal is Cleveland's swim season; the hollow teal run before it (April 27 to May 18) is when to open; the hollow amber run after is when to close, with October 12 as the deadline; gray is the covered season. Today's marker shows where you stand in that cycle right now.
The Cleveland pool calendar
Opening — target May 4
Target May 4; the practical window runs April 27–May 18, and the 7-day mean crosses the 61°F threshold around May 18. Cold-water starts are the cheap ones.
Closing — deadline October 12
The window opens October 2 once water leaves the algae zone; the model deadline is October 12, a week ahead of the November 12 freeze normal.
Estimated water temperature by month
This is Cleveland'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 31° | 30° | 34° | 44° | 56° | 66° | 73° | 74° | 70° | 61° | 50° | 39° |
The curve peaks near 74°F — comfortable-water months here usually involve a heater or a solar cover.
Every station tells its own story: compare this curve with Cincinnati's pool season and Columbus's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the Ohio season index.
Cleveland pool season FAQ
When should I open my pool in Cleveland, OH?
Target May 4. That date backs off two weeks from the day Cleveland's 7-day mean temperature reaches 61°F, so you start up in cold, algae-resistant water. Work the full checklist in the Cleveland opening guide.
When should I close my pool in Cleveland?
The closing deadline is October 12 — late enough that the water has cooled out of the algae zone, early enough to beat Cleveland's first-freeze normal by about a week. See the Cleveland closing guide for the winterizing steps.
How long is the swim season in Cleveland?
Cleveland averages 44 days a year with normal highs of 80°F or better — right on the statewide median. The Ohio season index ranks all 14 covered cities by the same metric.
How warm does pool water get in Cleveland?
An unheated pool near Cleveland typically peaks around 74°F in high summer and bottoms out near 29°F in winter, never quite reaching the 78°F comfort line without a heater or solar cover. The month-by-month curve above shows the whole cycle; the methodology page explains the ±5°F error bars.
Email me when Cleveland hits the closing window
Data: NOAA 1991–2020 climate normals via Cleveland Burke Airport (2.9 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.