Pool season · Texas
San Antonio Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
One bar, one year, one San Antonio 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.
The bar compresses San Antonio's whole pool year into one lane rope: gray floats for the off-season, hollow teal for the February 18–March 11 opening window, solid teal for swim weeks, hollow amber for the closing stretch that ends November 21. Wherever the today marker sits, the nearest color change is your next appointment.
The San Antonio pool calendar
Opening — target February 25
Open by February 25 — a two-week head start on the March 11 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline November 21
Hold the cover until November 12, then winterize by November 21, a week ahead of the November 28 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
This is San Antonio'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 52° | 53° | 59° | 66° | 72° | 80° | 83° | 85° | 82° | 75° | 65° | 56° |
Warmest water typically June–September (peaking near 85°F); heaters and covers shift any month up.
Email me when San Antonio hits the closing window
Data: NOAA 1991–2020 climate normals via San Antonio Incarnate Word (3.1 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.