Pool season · New York
Manhattan Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
This is the one-page view of Manhattan's pool year: both model windows, the estimated water-temperature curve, and today's live position on the season bar. The detailed checklists live on the opening and closing guides; this page is the calendar you check between them.
Each dot on the bar is one week of Manhattan's typical year, colored by what the model says that week is for: gray weeks are off-season, hollow teal marks the opening window (April 17–May 8), solid teal is swim season, and hollow amber is the closing window ending October 17. The black marker is today — its position against the colors is the entire executive summary.
The Manhattan pool calendar
Opening — target April 24
Open by April 24 — a two-week head start on the May 8 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline October 17
The window opens October 7 once water leaves the algae zone; the model deadline is October 17, a week ahead of the November 20 freeze normal.
Estimated water temperature by month
Monthly averages of the site's water model run on Manhattan'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 36° | 34° | 39° | 49° | 59° | 68° | 76° | 77° | 73° | 63° | 52° | 43° |
The curve peaks near 78°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when Manhattan hits the closing window
Data: NOAA 1991–2020 climate normals via New York Cntrl Peak Twr (0.4 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.