Pool season · California
San Leandro Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
One bar, one year, one San Leandro 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 Leandro's whole pool year into one lane rope: gray floats for the off-season, hollow teal for the May 8–May 29 opening window, solid teal for swim weeks, hollow amber for the closing stretch that ends October 28. Wherever the today marker sits, the nearest color change is your next appointment.
The San Leandro pool calendar
Opening — target May 15
Target May 15; the practical window runs May 8–May 29, and the 7-day mean crosses the 61°F threshold around May 29. Cold-water starts are the cheap ones.
Closing — deadline October 28
The window opens October 18 once water leaves the algae zone; the model deadline is October 28, a week ahead of the December 23 freeze normal.
Estimated water temperature by month
Monthly averages of the site's water model run on San Leandro'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 50° | 51° | 54° | 56° | 59° | 62° | 64° | 64° | 65° | 63° | 58° | 52° |
The curve peaks near 65°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when San Leandro hits the closing window
Data: NOAA 1991–2020 climate normals via Oakland Metro International Airport (3.5 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.