Pool swim season in Sebastian, FL
Sebastian, FL: how long the pool season really is
An unheated pool in Sebastian reaches 78°F in Jun to Oct, about 5 months a year. The air allows up to 12 swimmable months with a heater (all year).
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Heater options for a Sebastian pool, side by side
| Option | Months | Swimmable | Energy/yr | All-in/yr |
|---|---|---|---|---|
| No heater | 5 | Jun to Oct | $0 | $0 |
| Solar cover only | 8 | Apr to Nov | $0 | $50 |
| Solar panels + cover | 11 | Feb to Dec | $0 | $283 |
| Heat pump + cover | 12 | all year | $264 | $814 |
| Gas heater + cover | 12 | all year | $881 | $1,306 |
For a 450 sq ft pool held at 80°F, at FL prices of 15.3¢/kWh electricity and $25/Mcf gas. All-in spreads the purchase over the equipment's life.
The cheapest way to the full season in Sebastian
Solar panels + cover: 11 of 12 possible months for about $283 a year all-in, which works out near $47 for each month it adds.
Before you pay for any heater, buy a solar cover: on its own it adds 3 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: Vero Beach International Airport, 9.5 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
Sebastian 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 | 73° | 63° | 3.5 | 65° | 71° | $84 | $273 |
| Feb | 76° | 65° | 4.3 | 65° | 71° | $78 | $260 |
| Mar | 78° | 68° | 5.3 | 69° | 75° | $44 | $153 |
| Apr | 82° | 72° | 6.1 | 73° | 79° | $7 | $24 |
| May | 86° | 77° | 6.4 | 78° | 84° | – | – |
| Jun | 89° | 81° | 5.9 | 82° | 88° | – | – |
| Jul | 91° | 82° | 5.9 | 84° | 90° | – | – |
| Aug | 91° | 82° | 5.6 | 85° | 91° | – | – |
| Sep | 88° | 81° | 5.0 | 84° | 90° | – | – |
| Oct | 85° | 77° | 4.4 | 80° | 86° | – | – |
| Nov | 79° | 70° | 3.6 | 74° | 80° | – | – |
| Dec | 75° | 66° | 3.2 | 68° | 74° | $51 | $171 |
Heating costs most in Jan (about $84 with a heat pump, $273 with gas). Sunshine peaks in May at 6.4 kWh/m²/day (NASA satellite data, 31.1 km grid cell). Highlighted months are swimmable with no heater.
How Sebastian compares with nearby cities
Sebastian ranks 141 of 173 Florida cities for unheated swim months; Vero Beach nearby gets a longer season without a heater.
| City | Distance | Unheated months | Heat pump months | Heat pump $/yr |
|---|---|---|---|---|
| Vero Beach, FL | 11 mi | 6 | 12 | $229 |
| Palm Bay, FL | 16 mi | 5 | 12 | $351 |
| West Melbourne, FL | 22 mi | 5 | 12 | $324 |
| Melbourne, FL | 25 mi | 5 | 12 | $339 |
| Fort Pierce, FL | 26 mi | 5 | 12 | $270 |
| Satellite Beach, FL | 29 mi | 5 | 12 | $339 |