Pool season · Massachusetts
Quincy Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
One bar, one year, one Quincy 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.
Quincy, MA — 50 swim days a yearEach dot on the bar is one week of Quincy's typical year, colored by what the model says that week is for: gray weeks are off-season, hollow teal marks the opening window (May 9–May 30), solid teal is swim season, and hollow amber is the closing window ending October 4. The black marker is today — its position against the colors is the entire executive summary.
The Quincy pool calendar
Opening — target May 16
Open by May 16 — a two-week head start on the May 30 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline October 4
Hold the cover until September 24, then winterize by October 4, a week ahead of the October 26 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
This is Quincy's typical-year water curve: the same EWMA model as the live widget, run on the 1991–2020 normals instead of this week's weather.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 29° | 27° | 32° | 42° | 53° | 62° | 71° | 73° | 68° | 58° | 47° | 37° |
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 Newton's pool season and Somerville's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the Massachusetts season index.
Quincy pool season FAQ
When should I open my pool in Quincy, MA?
Target May 16. That date backs off two weeks from the day Quincy's 7-day mean temperature reaches 61°F, so you start up in cold, algae-resistant water. Work the full checklist in the Quincy opening guide.
When should I close my pool in Quincy?
The closing deadline is October 4 — late enough that the water has cooled out of the algae zone, early enough to beat Quincy's first-freeze normal by about a week. See the Quincy closing guide for the winterizing steps.
How long is the swim season in Quincy?
Quincy averages 50 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 Quincy?
An unheated pool near Quincy typically peaks around 73°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 Quincy hits the closing window
Data: NOAA 1991–2020 climate normals via Blue Hill Coop (5.5 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.