Pool season · California
Alhambra Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
Alhambra'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.
The bar compresses Alhambra's whole pool year into one lane rope: gray floats for the off-season, hollow teal for the February 25–March 18 opening window, solid teal for swim weeks, hollow amber for the closing stretch that ends November 30. Wherever the today marker sits, the nearest color change is your next appointment.
The Alhambra pool calendar
Opening — target March 4
Open by March 4 — a two-week head start on the March 18 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline November 30
Hold the cover until November 20, then winterize by November 30, a week ahead of the January 2 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
Monthly averages of the site's water model run on Alhambra'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 57° | 57° | 59° | 62° | 65° | 69° | 74° | 76° | 77° | 72° | 66° | 58° |
The curve peaks near 77°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when Alhambra hits the closing window
Data: NOAA 1991–2020 climate normals via San Gabriel Fire Dept (2.0 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.