Pool season · California
Alameda Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
Alameda'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 Alameda'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 29–May 20), solid teal is swim season, and hollow amber is the closing window ending November 11. The black marker is today — its position against the colors is the entire executive summary.
The Alameda pool calendar
Opening — target May 6
Open by May 6 — a two-week head start on the May 20 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline November 11
Hold the cover until November 1, then winterize by November 11, a week ahead of the December 23 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
This is Alameda'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 52° | 54° | 56° | 58° | 60° | 62° | 64° | 65° | 66° | 65° | 61° | 54° |
The curve peaks near 66°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when Alameda hits the closing window
Data: NOAA 1991–2020 climate normals via Oakland Museum (2.2 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.