Pool season · California
Manteca Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
This is the one-page view of Manteca'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.
Manteca, CA — 166 swim days a yearReading it takes ten seconds: 52 dots, one per week. Solid teal is Manteca's swim season; the hollow teal run before it (March 27 to April 17) is when to open; the hollow amber run after is when to close, with November 7 as the deadline; gray is the covered season. Today's marker shows where you stand in that cycle right now.
The Manteca pool calendar
Opening — target April 3
Target April 3; the practical window runs March 27–April 17, and the 7-day mean crosses the 61°F threshold around April 17. Cold-water starts are the cheap ones.
Closing — deadline November 7
Hold the cover until October 28, then winterize by November 7, a week ahead of the December 1 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
This is Manteca'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 47° | 50° | 55° | 59° | 65° | 71° | 77° | 78° | 76° | 70° | 60° | 50° |
Warmest water typically August–August (peaking near 78°F); heaters and covers shift any month up.
Every station tells its own story: compare this curve with Madera's pool season and Menifee's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the California season index.
Manteca pool season FAQ
When should I open my pool in Manteca, CA?
Open by April 3 — the model places Manteca's 61°F crossing about two weeks later, and every warm day you wait pushes the water toward the 65°F algae zone. The Manteca opening guide has the 12-step sequence.
When should I close my pool in Manteca?
Close by November 7: cool water keeps its winter chemistry, but freeze damage is the hard stop. The Manteca closing guide sequences the work backward from that date.
How long is the swim season in Manteca?
Manteca averages 166 days a year with normal highs of 80°F or better — right on the statewide median. The California season index ranks all 147 covered cities by the same metric.
How warm does pool water get in Manteca?
An unheated pool near Manteca typically peaks around 78°F in high summer and bottoms out near 47°F in winter, spending roughly 1 month 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 Manteca hits the closing window
Data: NOAA 1991–2020 climate normals via Stockton Metro Airport (6.6 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.