Pool season · West Virginia
Charleston Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
One bar, one year, one Charleston 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.
Each dot on the bar is one week of Charleston'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 8–April 29), solid teal is swim season, and hollow amber is the closing window ending October 15. The black marker is today — its position against the colors is the entire executive summary.
The Charleston pool calendar
Opening — target April 15
Target April 15; the practical window runs April 8–April 29, and the 7-day mean crosses the 61°F threshold around April 29. Cold-water starts are the cheap ones.
Closing — deadline October 15
The window opens October 5 once water leaves the algae zone; the model deadline is October 15, a week ahead of the October 26 freeze normal.
Estimated water temperature by month
Monthly averages of the site's water model run on Charleston'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 36° | 36° | 42° | 52° | 62° | 69° | 75° | 75° | 72° | 63° | 51° | 42° |
The curve peaks near 76°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when Charleston hits the closing window
Data: NOAA 1991–2020 climate normals via Charleston Yeager Airport (3.1 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.