Pool season · South Carolina
Mount Pleasant Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
Mount Pleasant'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.
Mount Pleasant, SC — 159 swim days a yearThe bar compresses Mount Pleasant's whole pool year into one lane rope: gray floats for the off-season, hollow teal for the March 16–April 6 opening window, solid teal for swim weeks, hollow amber for the closing stretch that ends November 15. Wherever the today marker sits, the nearest color change is your next appointment.
The Mount Pleasant pool calendar
Opening — target March 23
Open by March 23 — a two-week head start on the April 6 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline November 15
Hold the cover until November 5, then winterize by November 15, a week ahead of the November 30 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
Monthly averages of the site's water model run on Mount Pleasant'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 49° | 49° | 53° | 60° | 69° | 76° | 81° | 82° | 79° | 73° | 62° | 54° |
Warmest water typically July–September (peaking near 82°F); heaters and covers shift any month up.
Every station tells its own story: compare this curve with Mauldin's pool season and Myrtle Beach's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the South Carolina season index.
Mount Pleasant pool season FAQ
When should I open my pool in Mount Pleasant, SC?
Open by March 23 — the model places Mount Pleasant's 61°F crossing about two weeks later, and every warm day you wait pushes the water toward the 65°F algae zone. The Mount Pleasant opening guide has the 12-step sequence.
When should I close my pool in Mount Pleasant?
Close by November 15: cool water keeps its winter chemistry, but freeze damage is the hard stop. The Mount Pleasant closing guide sequences the work backward from that date.
How long is the swim season in Mount Pleasant?
Mount Pleasant averages 159 days a year with normal highs of 80°F or better — about 5 days earlier than the South Carolina median. The South Carolina season index ranks all 12 covered cities by the same metric.
How warm does pool water get in Mount Pleasant?
An unheated pool near Mount Pleasant typically peaks around 82°F in high summer and bottoms out near 48°F in winter, spending roughly 3 months at or above the 78°F comfort line most swimmers prefer. The month-by-month curve above shows the whole cycle; the methodology page explains the ±5°F error bars.
Email me when Mount Pleasant hits the closing window
Data: NOAA 1991–2020 climate normals via Sullivans Island (6.7 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.