Pool season · Michigan
Muskegon Pool Season: the Year on One Bar
Last updated: July 25, 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.
Muskegon, MI — 57 swim days a yearReading 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.
Every station tells its own story: compare this curve with Livonia's pool season and Port Huron's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the Michigan season index.
Muskegon pool season FAQ
When should I open my pool in Muskegon, MI?
Open by May 11 — the model places Muskegon's 61°F crossing about two weeks later, and every warm day you wait pushes the water toward the 65°F algae zone. The Muskegon opening guide has the 12-step sequence.
When should I close my pool in Muskegon?
Close by October 2: cool water keeps its winter chemistry, but freeze damage is the hard stop. The Muskegon closing guide sequences the work backward from that date.
How long is the swim season in Muskegon?
Muskegon averages 57 days a year with normal highs of 80°F or better — right on the statewide median. The Michigan season index ranks all 23 covered cities by the same metric.
How warm does pool water get in Muskegon?
An unheated pool near Muskegon typically peaks around 72°F in high summer and bottoms out near 26°F in winter, never quite reaching the 78°F comfort line without a heater or solar cover. The month-by-month curve above shows the whole cycle; the methodology page explains the ±5°F error bars.
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.