Pool season · California
El Monte Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
El Monte'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 El Monte'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 25–March 18), solid teal is swim season, and hollow amber is the closing window ending November 30. The black marker is today — its position against the colors is the entire executive summary.
The El Monte pool calendar
Opening — target March 4
Open by March 4 — a two-week head start on the March 18 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline November 30
The window opens November 20 once water leaves the algae zone; the model deadline is November 30, a week ahead of the January 2 freeze normal.
Estimated water temperature by month
This is El Monte'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 57° | 57° | 59° | 62° | 65° | 69° | 74° | 76° | 77° | 72° | 66° | 58° |
The curve peaks near 77°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when El Monte hits the closing window
Data: NOAA 1991–2020 climate normals via San Gabriel Fire Dept (4.2 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.