Pool season · Texas
League City Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
One bar, one year, one League City 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.
League City, TX — 181 swim days a yearEach dot on the bar is one week of League City'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 6–February 27), solid teal is swim season, and hollow amber is the closing window ending December 2. The black marker is today — its position against the colors is the entire executive summary.
The League City pool calendar
Opening — target February 13
Target February 13; the practical window runs February 6–February 27, and the 7-day mean crosses the 61°F threshold around February 27. Cold-water starts are the cheap ones.
Closing — deadline December 2
The window opens November 22 once water leaves the algae zone; the model deadline is December 2, a week ahead of the December 14 freeze normal.
Estimated water temperature by month
This is League City'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 55° | 56° | 62° | 67° | 74° | 81° | 83° | 84° | 82° | 76° | 67° | 59° |
Warmest water typically June–September (peaking near 84°F); heaters and covers shift any month up.
Every station tells its own story: compare this curve with Laredo's pool season and Leander's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the Texas season index.
League City pool season FAQ
When should I open my pool in League City, TX?
The site model recommends opening by February 13 — about two weeks before League City'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 League City opening guide.
When should I close my pool in League City?
Winterize by December 2. The model holds the deadline a week ahead of League City's NOAA 50% first-freeze date, so the plumbing is protected before the first hard night. The full sequence is in the League City closing guide.
How long is the swim season in League City?
League City averages 181 days a year with normal highs of 80°F or better — about 23 days earlier than the Texas median. The Texas season index ranks all 68 covered cities by the same metric.
How warm does pool water get in League City?
An unheated pool near League City typically peaks around 84°F in high summer and bottoms out near 54°F in winter, spending roughly 4 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 League City hits the closing window
Data: NOAA 1991–2020 climate normals via Houston Nwso (1.9 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.