Pool swim season in Brawley, CA
When can you swim in an outdoor pool in Brawley, CA?
An unheated pool in Brawley 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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Heater options for a Brawley pool, side by side
| Option | Months | Swimmable | Energy/yr | All-in/yr |
|---|---|---|---|---|
| No heater | 6 | May to Oct | $0 | $0 |
| Solar cover only | 7 | Apr to Oct | $0 | $50 |
| Solar panels + cover | 9 | Mar to Nov | $0 | $283 |
| Heat pump + cover | 12 | all year | $1,201 | $1,751 |
| Gas heater + cover | 12 | all year | $1,493 | $1,918 |
For a 450 sq ft pool held at 80°F, at CA prices of 32.6¢/kWh electricity and $22/Mcf gas. All-in spreads the purchase over the equipment's life.
The cheapest way to the full season in Brawley
Heat pump + cover: 12 of 12 possible months for about $1,751 a year all-in, which works out near $292 for each month it adds.
Before you pay for any heater, buy a solar cover: on its own it adds 1 month 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: Brawley 2 SW, 2.4 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
Brawley 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 | 72° | 57° | 3.6 | 57° | 63° | $371 | $446 |
| Feb | 75° | 60° | 4.5 | 60° | 66° | $291 | $366 |
| Mar | 81° | 66° | 6.0 | 66° | 72° | $159 | $216 |
| Apr | 87° | 71° | 7.3 | 72° | 78° | $28 | $42 |
| May | 95° | 78° | 8.1 | 79° | 85° | – | – |
| Jun | 104° | 86° | 8.4 | 87° | 93° | – | – |
| Jul | 108° | 92° | 7.7 | 94° | 100° | – | – |
| Aug | 108° | 93° | 7.2 | 97° | 103° | – | – |
| Sep | 104° | 88° | 6.3 | 94° | 100° | – | – |
| Oct | 93° | 77° | 5.1 | 84° | 90° | – | – |
| Nov | 80° | 64° | 3.9 | 71° | 77° | $50 | $67 |
| Dec | 70° | 55° | 3.2 | 60° | 66° | $302 | $356 |
Heating costs most in Jan (about $371 with a heat pump, $446 with gas). Sunshine peaks in Jun at 8.4 kWh/m²/day (NASA satellite data, 53.3 km grid cell). Highlighted months are swimmable with no heater.
How Brawley compares with nearby cities
Brawley ranks 11 of 376 California cities for unheated swim months, and no nearby city gets a longer unheated season.
| City | Distance | Unheated months | Heat pump months | Heat pump $/yr |
|---|---|---|---|---|
| Imperial, CA | 10 mi | 6 | 11 | $951 |
| El Centro, CA | 13 mi | 6 | 11 | $836 |
| Calexico, CA | 20 mi | 6 | 11 | $836 |
| Somerton, AZ | 55 mi | 6 | 10 | $174 |
| San Luis, AZ | 58 mi | 6 | 10 | $174 |
| Coachella, CA | 61 mi | 6 | 11 | $1,070 |