Pool season · Arizona
San Tan Valley Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
San Tan Valley'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 San Tan Valley's typical year, colored by what the model says that week is for: gray weeks are off-season, hollow teal marks the opening window (February 18–March 11), solid teal is swim season, and hollow amber is the closing window ending November 23. The black marker is today — its position against the colors is the entire executive summary.
The San Tan Valley pool calendar
Opening — target February 25
Target February 25; the practical window runs February 18–March 11, and the 7-day mean crosses the 61°F threshold around March 11. Cold-water starts are the cheap ones.
Closing — deadline November 23
The window opens November 13 once water leaves the algae zone; the model deadline is November 23, a week ahead of the December 11 freeze normal.
Estimated water temperature by month
Monthly averages of the site's water model run on San Tan Valley'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 52° | 55° | 59° | 66° | 73° | 83° | 90° | 91° | 88° | 79° | 66° | 55° |
Warmest water typically June–October (peaking near 92°F); heaters and covers shift any month up.
Email me when San Tan Valley hits the closing window
Data: NOAA 1991–2020 climate normals via Chandler Heights (7.1 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.