Pool season · Louisiana
Mandeville Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
This is the one-page view of Mandeville'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.
Mandeville, LA — 171 swim days a yearThe bar compresses Mandeville's whole pool year into one lane rope: gray floats for the off-season, hollow teal for the February 25–March 18 opening window, solid teal for swim weeks, hollow amber for the closing stretch that ends November 11. Wherever the today marker sits, the nearest color change is your next appointment.
The Mandeville pool calendar
Opening — target March 4
Open by March 4 — a two-week head start on the March 18 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline November 11
Hold the cover until November 5, then winterize by November 11, a week ahead of the November 18 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
Monthly averages of the site's water model run on Mandeville'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 51° | 52° | 58° | 64° | 70° | 77° | 80° | 81° | 79° | 73° | 63° | 55° |
Warmest water typically July–September (peaking near 81°F); heaters and covers shift any month up.
Every station tells its own story: compare this curve with Lake Charles's pool season and Metairie's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the Louisiana season index.
Mandeville pool season FAQ
When should I open my pool in Mandeville, LA?
Open by March 4 — the model places Mandeville's 61°F crossing about two weeks later, and every warm day you wait pushes the water toward the 65°F algae zone. The Mandeville opening guide has the 12-step sequence.
When should I close my pool in Mandeville?
Close by November 11: cool water keeps its winter chemistry, but freeze damage is the hard stop. The Mandeville closing guide sequences the work backward from that date.
How long is the swim season in Mandeville?
Mandeville averages 171 days a year with normal highs of 80°F or better — right on the statewide median. The Louisiana season index ranks all 13 covered cities by the same metric.
How warm does pool water get in Mandeville?
An unheated pool near Mandeville typically peaks around 81°F in high summer and bottoms out near 51°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 Mandeville hits the closing window
Data: NOAA 1991–2020 climate normals via Covington 4 NNW (10.6 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.