Pool season · California
Riverside Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
One bar, one year, one Riverside 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.
Reading it takes ten seconds: 52 dots, one per week. Solid teal is Riverside's swim season; the hollow teal run before it (March 5 to March 26) is when to open; the hollow amber run after is when to close, with November 26 as the deadline; gray is the covered season. Today's marker shows where you stand in that cycle right now.
The Riverside pool calendar
Opening — target March 12
Target March 12; the practical window runs March 5–March 26, and the 7-day mean crosses the 61°F threshold around March 26. Cold-water starts are the cheap ones.
Closing — deadline November 26
Hold the cover until November 16, then winterize by November 26, a week ahead of the December 25 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
Monthly averages of the site's water model run on Riverside'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° | 62° | 66° | 71° | 78° | 80° | 80° | 73° | 65° | 58° |
Warmest water typically July–September (peaking near 81°F); heaters and covers shift any month up.
Email me when Riverside hits the closing window
Data: NOAA 1991–2020 climate normals via Riverside Fire Station 3 (1.0 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.