Pool season · Arizona
Mesa Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
This is the one-page view of Mesa'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.
The bar compresses Mesa's whole pool year into one lane rope: gray floats for the off-season, hollow teal for the February 17–March 10 opening window, solid teal for swim weeks, hollow amber for the closing stretch that ends November 28. Wherever the today marker sits, the nearest color change is your next appointment.
The Mesa pool calendar
Opening — target February 24
Open by February 24 — a two-week head start on the March 10 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline November 28
Hold the cover until November 18, then winterize by November 28, a week ahead of the December 10 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
This is Mesa'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 53° | 55° | 59° | 66° | 74° | 83° | 91° | 92° | 89° | 80° | 68° | 56° |
Warmest water typically June–October (peaking near 92°F); heaters and covers shift any month up.
Email me when Mesa hits the closing window
Data: NOAA 1991–2020 climate normals via E Mesa (4.4 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.