Pool season · Massachusetts
Newton Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
One bar, one year, one Newton pool. The season bar below draws everything the model knows — opening window, prime season, closing window — against today's date, with the working details one click away on the opening and closing pages.
Newton, MA — 76 swim days a yearReading it takes ten seconds: 52 dots, one per week. Solid teal is Newton's swim season; the hollow teal run before it (May 3 to May 24) 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 Newton pool calendar
Opening — target May 10
Target May 10; the practical window runs May 3–May 24, and the 7-day mean crosses the 61°F threshold around May 24. Cold-water starts are the cheap ones.
Closing — deadline October 6
Hold the cover until September 26, then winterize by October 6, a week ahead of the October 23 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
Monthly averages of the site's water model run on Newton'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 30° | 29° | 34° | 43° | 54° | 64° | 73° | 74° | 70° | 59° | 48° | 38° |
The curve peaks near 74°F — comfortable-water months here usually involve a heater or a solar cover.
Every station tells its own story: compare this curve with New Bedford's pool season and Quincy's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the Massachusetts season index.
Newton pool season FAQ
When should I open my pool in Newton, MA?
Target May 10. That date backs off two weeks from the day Newton's 7-day mean temperature reaches 61°F, so you start up in cold, algae-resistant water. Work the full checklist in the Newton opening guide.
When should I close my pool in Newton?
The closing deadline is October 6 — late enough that the water has cooled out of the algae zone, early enough to beat Newton's first-freeze normal by about a week. See the Newton closing guide for the winterizing steps.
How long is the swim season in Newton?
Newton averages 76 days a year with normal highs of 80°F or better — right on the statewide median. The Massachusetts season index ranks all 14 covered cities by the same metric.
How warm does pool water get in Newton?
An unheated pool near Newton typically peaks around 74°F in high summer and bottoms out near 28°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 Newton hits the closing window
Data: NOAA 1991–2020 climate normals via Jamaica Plain (4.7 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.