Pool season · New York
New Rochelle Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
New Rochelle'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.
New Rochelle, NY — 86 swim days a yearReading it takes ten seconds: 52 dots, one per week. Solid teal is New Rochelle's swim season; the hollow teal run before it (April 24 to May 15) is when to open; the hollow amber run after is when to close, with October 10 as the deadline; gray is the covered season. Today's marker shows where you stand in that cycle right now.
The New Rochelle pool calendar
Opening — target May 1
Target May 1; the practical window runs April 24–May 15, and the 7-day mean crosses the 61°F threshold around May 15. Cold-water starts are the cheap ones.
Closing — deadline October 10
Hold the cover until September 30, then winterize by October 10, a week ahead of the October 26 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
Monthly averages of the site's water model run on New Rochelle'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 33° | 32° | 37° | 47° | 57° | 66° | 73° | 75° | 70° | 61° | 50° | 41° |
The curve peaks near 75°F — comfortable-water months here usually involve a heater or a solar cover.
Every station tells its own story: compare this curve with Manhattan's pool season and New York's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the New York season index.
New Rochelle pool season FAQ
When should I open my pool in New Rochelle, NY?
Target May 1. That date backs off two weeks from the day New Rochelle's 7-day mean temperature reaches 61°F, so you start up in cold, algae-resistant water. Work the full checklist in the New Rochelle opening guide.
When should I close my pool in New Rochelle?
The closing deadline is October 10 — late enough that the water has cooled out of the algae zone, early enough to beat New Rochelle's first-freeze normal by about a week. See the New Rochelle closing guide for the winterizing steps.
How long is the swim season in New Rochelle?
New Rochelle averages 86 days a year with normal highs of 80°F or better — about 5 days earlier than the New York median. The New York season index ranks all 16 covered cities by the same metric.
How warm does pool water get in New Rochelle?
An unheated pool near New Rochelle typically peaks around 75°F in high summer and bottoms out near 31°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 New Rochelle hits the closing window
Data: NOAA 1991–2020 climate normals via Dobbs Ferry-ardsley (5.9 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.