Pool season · Alabama
Birmingham Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
One bar, one year, one Birmingham 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.
Birmingham, AL — 152 swim days a yearReading it takes ten seconds: 52 dots, one per week. Solid teal is Birmingham's swim season; the hollow teal run before it (March 16 to April 6) is when to open; the hollow amber run after is when to close, with November 4 as the deadline; gray is the covered season. Today's marker shows where you stand in that cycle right now.
The Birmingham pool calendar
Opening — target March 23
Open by March 23 — a two-week head start on the April 6 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline November 4
The window opens October 25 once water leaves the algae zone; the model deadline is November 4, a week ahead of the November 11 freeze normal.
Estimated water temperature by month
Monthly averages of the site's water model run on Birmingham'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 45° | 46° | 53° | 60° | 68° | 76° | 80° | 82° | 79° | 70° | 59° | 50° |
Warmest water typically July–September (peaking near 82°F); heaters and covers shift any month up.
Every station tells its own story: compare this curve with Auburn's pool season and Dothan's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the Alabama season index.
Birmingham pool season FAQ
When should I open my pool in Birmingham, AL?
The site model recommends opening by March 23 — about two weeks before Birmingham'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 Birmingham opening guide.
When should I close my pool in Birmingham?
Winterize by November 4. The model holds the deadline a week ahead of Birmingham's NOAA 50% first-freeze date, so the plumbing is protected before the first hard night. The full sequence is in the Birmingham closing guide.
How long is the swim season in Birmingham?
Birmingham averages 152 days a year with normal highs of 80°F or better — right on the statewide median. The Alabama season index ranks all 10 covered cities by the same metric.
How warm does pool water get in Birmingham?
An unheated pool near Birmingham typically peaks around 82°F in high summer and bottoms out near 45°F in winter, spending roughly 3 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 Birmingham hits the closing window
Data: NOAA 1991–2020 climate normals via Birmingham Airport (4.0 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.