Pool season · California
Chula Vista Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
One bar, one year, one Chula Vista 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.
Each dot on the bar is one week of Chula Vista's typical year, colored by what the model says that week is for: gray weeks are off-season, hollow teal marks the opening window (March 28–April 18), solid teal is swim season, and hollow amber is the closing window ending November 25. The black marker is today — its position against the colors is the entire executive summary.
The Chula Vista pool calendar
Opening — target April 4
Target April 4; the practical window runs March 28–April 18, and the 7-day mean crosses the 61°F threshold around April 18. Cold-water starts are the cheap ones.
Closing — deadline November 25
The window opens November 15 once water leaves the algae zone; the model deadline is November 25, a week ahead of the December 31 freeze normal.
Estimated water temperature by month
Monthly averages of the site's water model run on Chula Vista'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 56° | 57° | 58° | 60° | 62° | 65° | 68° | 71° | 71° | 69° | 64° | 58° |
The curve peaks near 72°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when Chula Vista hits the closing window
Data: NOAA 1991–2020 climate normals via Chula Vista (4.2 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.