Pool season · South Carolina
Greenville Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
One bar, one year, one Greenville 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.
Reading it takes ten seconds: 52 dots, one per week. Solid teal is Greenville's swim season; the hollow teal run before it (March 31 to April 21) is when to open; the hollow amber run after is when to close, with October 22 as the deadline; gray is the covered season. Today's marker shows where you stand in that cycle right now.
The Greenville pool calendar
Opening — target April 7
Target April 7; the practical window runs March 31–April 21, and the 7-day mean crosses the 61°F threshold around April 21. Cold-water starts are the cheap ones.
Closing — deadline October 22
The window opens October 12 once water leaves the algae zone; the model deadline is October 22, a week ahead of the November 7 freeze normal.
Estimated water temperature by month
Monthly averages of the site's water model run on Greenville'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 41° | 42° | 48° | 56° | 64° | 71° | 77° | 77° | 74° | 65° | 54° | 46° |
The curve peaks near 78°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when Greenville hits the closing window
Data: NOAA 1991–2020 climate normals via Greenville (0.9 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.