Pool season · Massachusetts
Quincy Pool Season: the Year on One Bar
Last updated: July 15, 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.
Each 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.
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.