Pool season · Connecticut
Norwich Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
One bar, one year, one Norwich 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.
Norwich, CT — 73 swim days a yearReading it takes ten seconds: 52 dots, one per week. Solid teal is Norwich's swim season; the hollow teal run before it (May 1 to May 22) is when to open; the hollow amber run after is when to close, with October 7 as the deadline; gray is the covered season. Today's marker shows where you stand in that cycle right now.
The Norwich pool calendar
Opening — target May 8
Target May 8; the practical window runs May 1–May 22, and the 7-day mean crosses the 61°F threshold around May 22. Cold-water starts are the cheap ones.
Closing — deadline October 7
Hold the cover until September 27, then winterize by October 7, a week ahead of the October 24 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
This is Norwich'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 32° | 30° | 35° | 44° | 55° | 64° | 73° | 74° | 69° | 59° | 48° | 39° |
The curve peaks near 75°F — comfortable-water months here usually involve a heater or a solar cover.
Every station tells its own story: compare this curve with Norwalk's pool season and Stamford's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the Connecticut season index.
Norwich pool season FAQ
When should I open my pool in Norwich, CT?
Target May 8. That date backs off two weeks from the day Norwich's 7-day mean temperature reaches 61°F, so you start up in cold, algae-resistant water. Work the full checklist in the Norwich opening guide.
When should I close my pool in Norwich?
The closing deadline is October 7 — late enough that the water has cooled out of the algae zone, early enough to beat Norwich's first-freeze normal by about a week. See the Norwich closing guide for the winterizing steps.
How long is the swim season in Norwich?
Norwich averages 73 days a year with normal highs of 80°F or better — right on the statewide median. The Connecticut season index ranks all 8 covered cities by the same metric.
How warm does pool water get in Norwich?
An unheated pool near Norwich typically peaks around 75°F in high summer and bottoms out near 29°F in winter, never quite reaching the 78°F comfort line without a heater or solar cover. The month-by-month curve above shows the whole cycle; the methodology page explains the ±5°F error bars.
Email me when Norwich hits the closing window
Data: NOAA 1991–2020 climate normals via Norwich Public Utility Plt (2.0 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.