Pool season · Texas
Brownsville Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
Brownsville'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.
Brownsville, TX — 227 swim days a yearThe bar compresses Brownsville's whole pool year into one lane rope: gray floats for the off-season, hollow teal for the January 3–January 24 opening window, solid teal for swim weeks, hollow amber for the closing stretch that ends December 28. Wherever the today marker sits, the nearest color change is your next appointment.
The Brownsville pool calendar
Opening — target January 10
Target January 10; the practical window runs January 3–January 24, and the 7-day mean crosses the 61°F threshold around January 24. Cold-water starts are the cheap ones.
Closing — deadline December 28
The window opens December 23 once water leaves the algae zone; the model deadline is December 28, a week ahead of the January 4 freeze normal.
Estimated water temperature by month
Monthly averages of the site's water model run on Brownsville'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 60° | 63° | 67° | 73° | 78° | 83° | 84° | 85° | 84° | 79° | 72° | 65° |
Warmest water typically May–October (peaking near 86°F); heaters and covers shift any month up.
Every station tells its own story: compare this curve with Beaumont's pool season and Bryan's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the Texas season index.
Brownsville pool season FAQ
When should I open my pool in Brownsville, TX?
The site model recommends opening by January 10 — about two weeks before Brownsville'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 Brownsville opening guide.
When should I close my pool in Brownsville?
Winterize by December 28. The model holds the deadline a week ahead of Brownsville's NOAA 50% first-freeze date, so the plumbing is protected before the first hard night. The full sequence is in the Brownsville closing guide.
How long is the swim season in Brownsville?
Brownsville averages 227 days a year with normal highs of 80°F or better — about 57 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 Brownsville?
An unheated pool near Brownsville typically peaks around 86°F in high summer and bottoms out near 60°F in winter, spending roughly 6 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 Brownsville hits the closing window
Data: NOAA 1991–2020 climate normals via Wfo Brownsville (6.1 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.