Pool season · Missouri
Lee's Summit Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
Lee's Summit'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.
Each dot on the bar is one week of Lee's Summit'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 13–May 4), solid teal is swim season, and hollow amber is the closing window ending October 16. The black marker is today — its position against the colors is the entire executive summary.
The Lee's Summit pool calendar
Opening — target April 20
Open by April 20 — a two-week head start on the May 4 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline October 16
The window opens October 6 once water leaves the algae zone; the model deadline is October 16, a week ahead of the October 29 freeze normal.
Estimated water temperature by month
Monthly averages of the site's water model run on Lee's Summit'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 32° | 32° | 41° | 51° | 61° | 71° | 78° | 79° | 74° | 63° | 51° | 39° |
Warmest water typically July–August (peaking near 79°F); heaters and covers shift any month up.
Email me when Lee's Summit hits the closing window
Data: NOAA 1991–2020 climate normals via Lees Summit Municipal Airport (3.0 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.