Pool season · California
South Gate Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
This is the one-page view of South Gate'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.
South Gate, CA — 98 swim days a yearEach dot on the bar is one week of South Gate's typical year, colored by what the model says that week is for: gray weeks are off-season, hollow teal marks the opening window (February 21–March 14), solid teal is swim season, and hollow amber is the closing window ending December 3. The black marker is today — its position against the colors is the entire executive summary.
The South Gate pool calendar
Opening — target February 28
Open by February 28 — a two-week head start on the March 14 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline December 3
Hold the cover until November 23, then winterize by December 3, a week ahead of the January 2 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
This is South Gate's typical-year water curve: the same EWMA model as the live widget, run on the 1991–2020 normals instead of this week's weather.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 58° | 59° | 60° | 62° | 65° | 68° | 72° | 74° | 75° | 71° | 66° | 60° |
The curve peaks near 75°F — comfortable-water months here usually involve a heater or a solar cover.
Every station tells its own story: compare this curve with Simi Valley's pool season and Stockton's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the California season index.
South Gate pool season FAQ
When should I open my pool in South Gate, CA?
Target February 28. That date backs off two weeks from the day South Gate's 7-day mean temperature reaches 61°F, so you start up in cold, algae-resistant water. Work the full checklist in the South Gate opening guide.
When should I close my pool in South Gate?
The closing deadline is December 3 — late enough that the water has cooled out of the algae zone, early enough to beat South Gate's first-freeze normal by about a week. See the South Gate closing guide for the winterizing steps.
How long is the swim season in South Gate?
South Gate averages 98 days a year with normal highs of 80°F or better — about 32 days earlier than the California median. The California season index ranks all 147 covered cities by the same metric.
How warm does pool water get in South Gate?
An unheated pool near South Gate typically peaks around 75°F in high summer and bottoms out near 58°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 South Gate hits the closing window
Data: NOAA 1991–2020 climate normals via Los Angeles Dwtn Usc Campus (7.8 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.