Pool season · California
Redlands Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
Redlands'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.
Redlands, CA — 166 swim days a yearEach dot on the bar is one week of Redlands'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 Redlands 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 Redlands'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 Redding's pool season and Redondo Beach's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the California season index.
Redlands pool season FAQ
When should I open my pool in Redlands, CA?
The site model recommends opening by March 29 — about two weeks before Redlands's 7-day mean temperature crosses 61°F, while the water is still too cold for algae. The step-by-step sequence is in the Redlands opening guide.
When should I close my pool in Redlands?
Winterize by November 23. The model holds the deadline a week ahead of Redlands's NOAA 50% first-freeze date, so the plumbing is protected before the first hard night. The full sequence is in the Redlands closing guide.
How long is the swim season in Redlands?
Redlands 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 Redlands?
An unheated pool near Redlands 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 Redlands hits the closing window
Data: NOAA 1991–2020 climate normals via Redlands (1.7 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.