Pool season · Indiana
South Bend Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
South Bend'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.
South Bend, IN — 71 swim days a yearReading it takes ten seconds: 52 dots, one per week. Solid teal is South Bend's swim season; the hollow teal run before it (April 28 to May 19) is when to open; the hollow amber run after is when to close, with October 6 as the deadline; gray is the covered season. Today's marker shows where you stand in that cycle right now.
The South Bend pool calendar
Opening — target May 5
Open by May 5 — a two-week head start on the May 19 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline October 6
The window opens September 26 once water leaves the algae zone; the model deadline is October 6, a week ahead of the October 23 freeze normal.
Estimated water temperature by month
Monthly averages of the site's water model run on South Bend'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 26° | 25° | 32° | 44° | 55° | 66° | 72° | 73° | 68° | 59° | 45° | 35° |
The curve peaks near 73°F — comfortable-water months here usually involve a heater or a solar cover.
Every station tells its own story: compare this curve with Muncie's pool season and Terre Haute's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the Indiana season index.
South Bend pool season FAQ
When should I open my pool in South Bend, IN?
Target May 5. That date backs off two weeks from the day South Bend's 7-day mean temperature reaches 61°F, so you start up in cold, algae-resistant water. Work the full checklist in the South Bend opening guide.
When should I close my pool in South Bend?
The closing deadline is October 6 — late enough that the water has cooled out of the algae zone, early enough to beat South Bend's first-freeze normal by about a week. See the South Bend closing guide for the winterizing steps.
How long is the swim season in South Bend?
South Bend averages 71 days a year with normal highs of 80°F or better — about 4 days later than the Indiana median. The Indiana season index ranks all 13 covered cities by the same metric.
How warm does pool water get in South Bend?
An unheated pool near South Bend typically peaks around 73°F in high summer and bottoms out near 24°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 South Bend hits the closing window
Data: NOAA 1991–2020 climate normals via S Bend (2.0 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.