Pool season · Michigan
Muskegon Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
Muskegon'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.
Reading it takes ten seconds: 52 dots, one per week. Solid teal is Muskegon's swim season; the hollow teal run before it (May 4 to May 25) is when to open; the hollow amber run after is when to close, with October 2 as the deadline; gray is the covered season. Today's marker shows where you stand in that cycle right now.
The Muskegon pool calendar
Opening — target May 11
Open by May 11 — a two-week head start on the May 25 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline October 2
The window opens September 22 once water leaves the algae zone; the model deadline is October 2, a week ahead of the October 19 freeze normal.
Estimated water temperature by month
Monthly averages of the site's water model run on Muskegon'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 29° | 26° | 32° | 42° | 53° | 64° | 71° | 72° | 68° | 58° | 46° | 36° |
The curve peaks near 72°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when Muskegon hits the closing window
Data: NOAA 1991–2020 climate normals via Muskegon Co Airport (4.0 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.