Pool season · California
Moreno Valley Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
This is the one-page view of Moreno Valley'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.
Moreno Valley, CA — 166 swim days a yearEach dot on the bar is one week of Moreno Valley'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 Moreno Valley pool calendar
Opening — target March 29
Target March 29; the practical window runs March 22–April 12, and the 7-day mean crosses the 61°F threshold around April 12. Cold-water starts are the cheap ones.
Closing — deadline November 23
Hold the cover until November 13, then winterize by November 23, a week ahead of the December 19 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
Monthly averages of the site's water model run on Moreno Valley'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.
Every station tells its own story: compare this curve with Modesto's pool season and Mountain View's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the California season index.
Moreno Valley pool season FAQ
When should I open my pool in Moreno Valley, CA?
Target March 29. That date backs off two weeks from the day Moreno Valley's 7-day mean temperature reaches 61°F, so you start up in cold, algae-resistant water. Work the full checklist in the Moreno Valley opening guide.
When should I close my pool in Moreno Valley?
The closing deadline is November 23 — late enough that the water has cooled out of the algae zone, early enough to beat Moreno Valley's first-freeze normal by about a week. See the Moreno Valley closing guide for the winterizing steps.
How long is the swim season in Moreno Valley?
Moreno Valley averages 166 days a year with normal highs of 80°F or better — right on the statewide median. The California season index ranks all 147 covered cities by the same metric.
How warm does pool water get in Moreno Valley?
An unheated pool near Moreno Valley typically peaks around 80°F in high summer and bottoms out near 53°F in winter, spending roughly 2 months at or above the 78°F comfort line most swimmers prefer. The month-by-month curve above shows the whole cycle; the methodology page explains the ±5°F error bars.
Email me when Moreno Valley hits the closing window
Data: NOAA 1991–2020 climate normals via Redlands (7.8 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.