Pool season · Pennsylvania
Reading Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
Reading'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.
Each dot on the bar is one week of Reading'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 20–May 11), solid teal is swim season, and hollow amber is the closing window ending October 10. The black marker is today — its position against the colors is the entire executive summary.
The Reading pool calendar
Opening — target April 27
Open by April 27 — a two-week head start on the May 11 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline October 10
The window opens September 30 once water leaves the algae zone; the model deadline is October 10, a week ahead of the October 29 freeze normal.
Estimated water temperature by month
Monthly averages of the site's water model run on Reading'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 32° | 31° | 37° | 48° | 58° | 68° | 75° | 76° | 71° | 61° | 49° | 40° |
The curve peaks near 76°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when Reading hits the closing window
Data: NOAA 1991–2020 climate normals via Reading Spaatz Field (2.8 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.