Pool season · California
San Buenaventura Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
San Buenaventura'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.
San Buenaventura, CA — 0 swim days a yearEach dot on the bar is one week of San Buenaventura's typical year, colored by what the model says that week is for: gray weeks are off-season, hollow teal marks the opening window (April 23–May 14), solid teal is swim season, and hollow amber is the closing window ending November 20. The black marker is today — its position against the colors is the entire executive summary.
The San Buenaventura pool calendar
Opening — target April 30
Open by April 30 — a two-week head start on the May 14 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline November 20
Hold the cover until November 10, then winterize by November 20, a week ahead of the December 28 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
Monthly averages of the site's water model run on San Buenaventura'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° | 56° | 57° | 58° | 60° | 62° | 66° | 67° | 67° | 66° | 62° | 58° |
The curve peaks near 67°F — comfortable-water months here usually involve a heater or a solar cover.
Every station tells its own story: compare this curve with San Bernardino's pool season and San Diego's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the California season index.
San Buenaventura pool season FAQ
When should I open my pool in San Buenaventura, CA?
Open by April 30 — the model places San Buenaventura's 61°F crossing about two weeks later, and every warm day you wait pushes the water toward the 65°F algae zone. The San Buenaventura opening guide has the 12-step sequence.
When should I close my pool in San Buenaventura?
Close by November 20: cool water keeps its winter chemistry, but freeze damage is the hard stop. The San Buenaventura closing guide sequences the work backward from that date.
How long is the swim season in San Buenaventura?
San Buenaventura averages 0 days a year with normal highs of 80°F or better — about 29 days later than the California median. The California season index ranks all 147 covered cities by the same metric.
How warm does pool water get in San Buenaventura?
An unheated pool near San Buenaventura typically peaks around 67°F in high summer and bottoms out near 56°F in winter, never quite reaching the 78°F comfort line without a heater or solar cover. The month-by-month curve above shows the whole cycle; the methodology page explains the ±5°F error bars.
Email me when San Buenaventura hits the closing window
Data: NOAA 1991–2020 climate normals via Oxnard Ventura Co Airport (5.3 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.