Pool swim season in Hardeeville, SC
When can you swim in an outdoor pool in Hardeeville, SC?
An unheated pool in Hardeeville reaches 78°F in Jun to Sep, about 4 months a year. The air allows up to 9 swimmable months with a heater (Mar to Nov).
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Heater options for a Hardeeville pool, side by side
| Option | Months | Swimmable | Energy/yr | All-in/yr |
|---|---|---|---|---|
| No heater | 4 | Jun to Sep | $0 | $0 |
| Solar cover only | 6 | May to Oct | $0 | $50 |
| Solar panels + cover | 7 | Apr to Oct | $0 | $283 |
| Heat pump + cover | 9 | Mar to Nov | $321 | $871 |
| Gas heater + cover | 9 | Mar to Nov | $650 | $1,075 |
For a 450 sq ft pool held at 80°F, at SC prices of 15.9¢/kWh electricity and $17/Mcf gas. All-in spreads the purchase over the equipment's life.
The cheapest way to the full season in Hardeeville
Heat pump + cover: 9 of 9 possible months for about $871 a year all-in, which works out near $174 for each month it adds.
Before you pay for any heater, buy a solar cover: on its own it adds 2 months here for about $50 a year (why a cover comes first). If you get quotes, ask for a heat pump sized to your pool's surface area; here it beats gas all-in (heat pump or gas).
Weather station: Savannah International Airport, 14.7 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
Hardeeville month by month: air, sun and pool water
| Month | Air high | Air avg | Sun kWh/m²/day | Water, unheated | Water, covered | Heat pump $ | Gas $ |
|---|---|---|---|---|---|---|---|
| Jan | 61° | 51° | 3.0 | 52° | 58° | – | – |
| Feb | 65° | 54° | 3.6 | 53° | 59° | – | – |
| Mar | 71° | 60° | 4.6 | 59° | 65° | $151 | $301 |
| Apr | 78° | 67° | 5.9 | 66° | 72° | $70 | $152 |
| May | 85° | 74° | 6.3 | 74° | 80° | $2 | $5 |
| Jun | 90° | 80° | 6.3 | 80° | 86° | – | – |
| Jul | 92° | 83° | 6.2 | 85° | 91° | – | – |
| Aug | 91° | 82° | 5.6 | 85° | 91° | – | – |
| Sep | 86° | 78° | 4.8 | 82° | 88° | – | – |
| Oct | 79° | 69° | 4.1 | 74° | 80° | – | – |
| Nov | 70° | 59° | 3.3 | 64° | 70° | $98 | $192 |
| Dec | 64° | 53° | 2.6 | 56° | 62° | – | – |
Heating costs most in Mar (about $151 with a heat pump, $301 with gas). Sunshine peaks in May at 6.3 kWh/m²/day (NASA satellite data, 48.7 km grid cell). Highlighted months are swimmable with no heater.
How Hardeeville compares with nearby cities
Hardeeville ranks 9 of 42 South Carolina cities for unheated swim months, and no nearby city gets a longer unheated season.
| City | Distance | Unheated months | Heat pump months | Heat pump $/yr |
|---|---|---|---|---|
| Bluffton, SC | 9 mi | 4 | 9 | $316 |
| Rincon, GA | 11 mi | 4 | 9 | $312 |
| Port Wentworth, GA | 12 mi | 4 | 9 | $312 |
| Garden City, GA | 16 mi | 4 | 9 | $312 |
| Pooler, GA | 18 mi | 4 | 9 | $312 |
| Hilton Head Island, SC | 19 mi | 4 | 9 | $296 |