Pool season · Texas
Port Arthur Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
One bar, one year, one Port Arthur 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.
Port Arthur, TX — 185 swim days a yearThe bar compresses Port Arthur's whole pool year into one lane rope: gray floats for the off-season, hollow teal for the February 12–March 5 opening window, solid teal for swim weeks, hollow amber for the closing stretch that ends November 28. Wherever the today marker sits, the nearest color change is your next appointment.
The Port Arthur pool calendar
Opening — target February 19
Target February 19; the practical window runs February 12–March 5, and the 7-day mean crosses the 61°F threshold around March 5. Cold-water starts are the cheap ones.
Closing — deadline November 28
The window opens November 18 once water leaves the algae zone; the model deadline is November 28, a week ahead of the December 7 freeze normal.
Estimated water temperature by month
This is Port Arthur'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 54° | 55° | 61° | 67° | 73° | 80° | 83° | 84° | 82° | 76° | 66° | 58° |
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 Plano's pool season and Richardson's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the Texas season index.
Port Arthur pool season FAQ
When should I open my pool in Port Arthur, TX?
Target February 19. That date backs off two weeks from the day Port Arthur's 7-day mean temperature reaches 61°F, so you start up in cold, algae-resistant water. Work the full checklist in the Port Arthur opening guide.
When should I close my pool in Port Arthur?
The closing deadline is November 28 — late enough that the water has cooled out of the algae zone, early enough to beat Port Arthur's first-freeze normal by about a week. See the Port Arthur closing guide for the winterizing steps.
How long is the swim season in Port Arthur?
Port Arthur averages 185 days a year with normal highs of 80°F or better — about 17 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 Port Arthur?
An unheated pool near Port Arthur typically peaks around 84°F in high summer and bottoms out near 53°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 Port Arthur hits the closing window
Data: NOAA 1991–2020 climate normals via Port Arthur SE Tx Airport (8.6 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.