Pool season · California
San Jose Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
San Jose'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 San Jose's whole pool year into one lane rope: gray floats for the off-season, hollow teal for the April 5–April 26 opening window, solid teal for swim weeks, hollow amber for the closing stretch that ends November 7. Wherever the today marker sits, the nearest color change is your next appointment.
The San Jose pool calendar
Opening — target April 12
Open by April 12 — a two-week head start on the April 26 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline November 7
Hold the cover until October 28, then winterize by November 7, a week ahead of the December 25 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
Monthly averages of the site's water model run on San Jose'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° | 53° | 56° | 59° | 62° | 67° | 70° | 71° | 71° | 67° | 60° | 53° |
The curve peaks near 71°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when San Jose hits the closing window
Data: NOAA 1991–2020 climate normals via San Jose (4.5 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.