Warm enough to swim? Memphis month by month
| Month | Daily high | Daily average | Verdict |
|---|---|---|---|
| January | 51°F | 42°F | Off-season |
| February | 56°F | 46°F | Off-season |
| March | 64°F | 54°F | Heater territory |
| April | 73°F | 63°F | Brisk — fine in a warm spell |
| May | 82°F | 72°F | Comfortable |
| June | 89°F | 80°F | Prime swimming |
| July | 92°F | 83°F | Prime swimming |
| August | 92°F | 82°F | Prime swimming |
| September | 86°F | 76°F | Prime swimming |
| October | 75°F | 65°F | Brisk — fine in a warm spell |
| November | 63°F | 53°F | Heater territory |
| December | 53°F | 45°F | Off-season |
Verdicts follow the daily average: 68°F+ is comfortable for most people, 75°F+ is prime, and below 62°F you're in heater territory. An unheated pool's water tends to sit near the recent daily average, a touch above it in spring and below in fall.
Reading the Memphis pool year
The Memphis season splits into three acts. Opening (Apr 11 – May 1): clear the cover, rebalance, and shock — our dosing calculator turns your first test kit reading into exact amounts. Midseason: weekly testing and small corrections, with chlorine demand peaking around July. Closing (Oct 6 – Oct 22): wait for water to hold below ~60°F, balance, then cover — algae is nearly dormant by then, which is what makes spring easy.
Frequently asked questions
When should I open my pool in Memphis?
Most Memphis owners are happy opening in the Apr 11 – May 1 stretch — that's when daily average air temperature climbs through the low-to-mid 60s°F, which puts the water near 70°F within a couple of weeks. Opening earlier is fine (algae actually prefers a late opening: a warm, covered pool with no chlorine is a petri dish); swimming just starts brisk.
When should I close my pool in Memphis?
Around Oct 6 – Oct 22, as daily averages fall back through the low 60s°F. Waiting until water holds below ~60°F is smart — algae is nearly dormant there, so the pool goes into winter clean. Closing too early in warm weather is the classic recipe for a swampy spring opening.
How long is the swim season in Memphis?
About 176 days without a heater — from roughly Apr 21 to Oct 14. A heat pump or gas heater typically adds 3–6 weeks on each end; a solar cover alone adds a week or two by holding overnight gains.
Where do these Memphis dates come from?
From 1991–2020 NOAA temperature records at the Memphis International Airport station, 12 km from central Memphis. The working assumption: pools become pleasant as daily average air temperature passes 62–68°F, since water lags air by a week or two. A heater, cover, screened enclosure, or an unusually sunny yard all shift the real dates.