Pool season · California
Perris Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
This is the one-page view of Perris's pool year: both model windows, the estimated water-temperature curve, and today's live position on the season bar. The detailed checklists live on the opening and closing guides; this page is the calendar you check between them.
Each dot on the bar is one week of Perris'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 13–April 3), solid teal is swim season, and hollow amber is the closing window ending November 21. The black marker is today — its position against the colors is the entire executive summary.
The Perris pool calendar
Opening — target March 20
Open by March 20 — a two-week head start on the April 3 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline November 21
Hold the cover until November 11, then winterize by November 21, a week ahead of the December 18 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
Monthly averages of the site's water model run on Perris'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 53° | 54° | 57° | 61° | 65° | 71° | 78° | 81° | 80° | 73° | 64° | 55° |
Warmest water typically July–September (peaking near 82°F); heaters and covers shift any month up.
Email me when Perris hits the closing window
Data: NOAA 1991–2020 climate normals via Elsinore (10.1 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.