Pool season · Virginia
Williamsburg Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
One bar, one year, one Williamsburg 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.
Each dot on the bar is one week of Williamsburg'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 2–April 23), solid teal is swim season, and hollow amber is the closing window ending October 26. The black marker is today — its position against the colors is the entire executive summary.
The Williamsburg pool calendar
Opening — target April 9
Target April 9; the practical window runs April 2–April 23, and the 7-day mean crosses the 61°F threshold around April 23. Cold-water starts are the cheap ones.
Closing — deadline October 26
Hold the cover until October 16, then winterize by October 26, a week ahead of the November 10 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
Monthly averages of the site's water model run on Williamsburg'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 41° | 40° | 46° | 55° | 64° | 71° | 78° | 79° | 75° | 66° | 56° | 47° |
Warmest water typically July–August (peaking near 79°F); heaters and covers shift any month up.
Email me when Williamsburg hits the closing window
Data: NOAA 1991–2020 climate normals via Williamsburg 2 N (2.2 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.