Pool season · Virginia
Alexandria Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
Alexandria'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.
Each dot on the bar is one week of Alexandria's typical year, colored by what the model says that week is for: gray weeks are off-season, hollow teal marks the opening window (April 3–April 24), solid teal is swim season, and hollow amber is the closing window ending October 25. The black marker is today — its position against the colors is the entire executive summary.
The Alexandria pool calendar
Opening — target April 10
Open by April 10 — a two-week head start on the April 24 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline October 25
The window opens October 15 once water leaves the algae zone; the model deadline is October 25, a week ahead of the November 18 freeze normal.
Estimated water temperature by month
Monthly averages of the site's water model run on Alexandria'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 39° | 38° | 44° | 53° | 63° | 72° | 80° | 81° | 76° | 66° | 55° | 45° |
Warmest water typically July–August (peaking near 81°F); heaters and covers shift any month up.
Email me when Alexandria hits the closing window
Data: NOAA 1991–2020 climate normals via Washington Reagan Airport (3.5 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.