Pool season · California
San Bernardino Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
San Bernardino'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 San Bernardino'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 22–April 12), solid teal is swim season, and hollow amber is the closing window ending November 23. The black marker is today — its position against the colors is the entire executive summary.
The San Bernardino pool calendar
Opening — target March 29
Open by March 29 — a two-week head start on the April 12 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline November 23
The window opens November 13 once water leaves the algae zone; the model deadline is November 23, a week ahead of the December 19 freeze normal.
Estimated water temperature by month
Monthly averages of the site's water model run on San Bernardino'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° | 56° | 60° | 64° | 69° | 77° | 80° | 78° | 72° | 64° | 56° |
Warmest water typically August–September (peaking near 80°F); heaters and covers shift any month up.
Email me when San Bernardino hits the closing window
Data: NOAA 1991–2020 climate normals via Redlands (9.2 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.