Pool season · California
Santa Ana Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
Santa Ana'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.
Each dot on the bar is one week of Santa Ana's typical year, colored by what the model says that week is for: gray weeks are off-season, hollow teal marks the opening window (February 16–March 9), solid teal is swim season, and hollow amber is the closing window ending December 4. The black marker is today — its position against the colors is the entire executive summary.
The Santa Ana pool calendar
Opening — target February 23
Open by February 23 — a two-week head start on the March 9 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline December 4
The window opens November 24 once water leaves the algae zone; the model deadline is December 4, a week ahead of the December 25 freeze normal.
Estimated water temperature by month
This is Santa Ana'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 59° | 59° | 60° | 63° | 65° | 68° | 72° | 74° | 75° | 72° | 67° | 60° |
The curve peaks near 75°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when Santa Ana hits the closing window
Data: NOAA 1991–2020 climate normals via Santa Ana Fire Station (1.0 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.