Pool swim season in Miami, FL
Miami, FL: how long the pool season really is
An unheated pool in Miami reaches 78°F in May to Oct, about 6 months a year. The air allows up to 12 swimmable months with a heater (all year).
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What each heater buys you in Miami
| Option | Months | Swimmable | Energy/yr | All-in/yr |
|---|---|---|---|---|
| No heater | 6 | May to Oct | $0 | $0 |
| Solar cover only | 10 | Mar to Dec | $0 | $50 |
| Solar panels + cover | 12 | all year | $0 | $283 |
| Heat pump + cover | 12 | all year | $99 | $649 |
| Gas heater + cover | 12 | all year | $349 | $774 |
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 Miami
Solar panels + cover: 12 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 4 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: Miami Beach, 5.2 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
Miami 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 | 74° | 67° | 3.7 | 70° | 76° | $38 | $132 |
| Feb | 75° | 69° | 4.5 | 70° | 76° | $37 | $128 |
| Mar | 77° | 71° | 5.5 | 73° | 79° | $12 | $45 |
| Apr | 80° | 75° | 6.2 | 76° | 82° | – | – |
| May | 83° | 78° | 6.2 | 80° | 86° | – | – |
| Jun | 86° | 81° | 5.7 | 82° | 88° | – | – |
| Jul | 88° | 83° | 5.9 | 85° | 91° | – | – |
| Aug | 88° | 83° | 5.6 | 86° | 92° | – | – |
| Sep | 87° | 82° | 5.0 | 85° | 91° | – | – |
| Oct | 84° | 79° | 4.5 | 82° | 88° | – | – |
| Nov | 79° | 74° | 3.9 | 77° | 83° | – | – |
| Dec | 76° | 70° | 3.4 | 73° | 79° | $12 | $44 |
Heating costs most in Jan (about $38 with a heat pump, $132 with gas). Sunshine peaks in May at 6.2 kWh/m²/day (NASA satellite data, 42.3 km grid cell). Highlighted months are swimmable with no heater.
How Miami compares with nearby cities
Miami ranks 78 of 173 Florida cities for unheated swim months; Key Biscayne, South Miami, Coral Gables nearby get a longer season without a heater.
| City | Distance | Unheated months | Heat pump months | Heat pump $/yr |
|---|---|---|---|---|
| Miami Beach, FL | 4 mi | 6 | 12 | $99 |
| Miami Springs, FL | 6 mi | 6 | 12 | $88 |
| Key Biscayne, FL | 6 mi | 8 | 12 | $28 |
| Miami Shores, FL | 7 mi | 6 | 12 | $99 |
| South Miami, FL | 7 mi | 7 | 12 | $47 |
| Coral Gables, FL | 7 mi | 7 | 12 | $47 |