Pool season · California
Redwood City Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
This is the one-page view of Redwood City's pool year: both model windows, the estimated water-temperature curve, and today's live position on the season bar. The detailed checklists live on the opening and closing guides; this page is the calendar you check between them.
Each dot on the bar is one week of Redwood City'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 21–May 12), solid teal is swim season, and hollow amber is the closing window ending November 1. The black marker is today — its position against the colors is the entire executive summary.
The Redwood City pool calendar
Opening — target April 28
Open by April 28 — a two-week head start on the May 12 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline November 1
The window opens October 22 once water leaves the algae zone; the model deadline is November 1, a week ahead of the December 12 freeze normal.
Estimated water temperature by month
Monthly averages of the site's water model run on Redwood City'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 49° | 51° | 54° | 56° | 60° | 64° | 68° | 69° | 68° | 65° | 58° | 51° |
The curve peaks near 69°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when Redwood City hits the closing window
Data: NOAA 1991–2020 climate normals via Redwood City (1.9 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.