Pool season · Texas
Mission Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
Mission runs a twelve-month pool calendar — the model finds no week cold enough to force a closing. This page tracks the water-temperature curve and the prime-season stretch; the spring refresh and winter care guides cover the routines that replace opening and closing here. Keep it bookmarked as the between-guides dashboard for the year.
Mission, TX — 260 swim days a yearOne color, 52 dots: Mission's bar has no gray because the model never finds a week that forces a closing. Use the monthly water estimates below instead — the swing from 62°F to 90°F is what actually shapes swimming and maintenance here, from heater decisions at the cool end to sanitizer demand across the 260 days of genuine summer.
The Mission pool calendar
Spring refresh
No forced dates: the 7-day mean never leaves the swim-viable range (floor 62.0°F). Spring refresh and winter care replace opening and closing.
Winter care
No forced dates: the 7-day mean never leaves the swim-viable range (floor 62.0°F). Spring refresh and winter care replace opening and closing.
Estimated water temperature by month
Monthly averages of the site's water model run on Mission'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 63° | 65° | 70° | 76° | 81° | 86° | 88° | 89° | 87° | 82° | 74° | 66° |
Warmest water typically May–October (peaking near 90°F); heaters and covers shift any month up.
Every station tells its own story: compare this curve with Midland's pool season and Missouri City's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the Texas season index.
Mission pool season FAQ
Does Mission, TX need a seasonal pool opening?
No — the model classifies Mission as a year-round climate: the 7-day mean temperature never settles below the 61°F threshold long enough to justify a hard winter shutdown. Keep the pump circulating and the sanitizer in range through the cool months instead. Details are in the Mission opening guide.
Should you ever close a pool in Mission?
Rarely. With 260 days of 80°F+ highs a year, most Mission owners run the pool continuously and simply trim pump hours in the cool season. If you do want a shutdown checklist, the Mission closing guide covers the mild-winter variant.
How long is the swim season in Mission?
Mission averages 260 days a year with normal highs of 80°F or better. The Texas season index ranks all 68 covered cities by the same metric.
How warm does pool water get in Mission?
An unheated pool near Mission typically peaks around 90°F in high summer and bottoms out near 62°F in winter, spending roughly 6 months 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 Mission hits the closing window
Data: NOAA 1991–2020 climate normals via Mcallen Miller International Airport (4.7 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.