Pool swim season in El Segundo, CA
Swim season in El Segundo without a heater, and with one
An unheated pool in El Segundo never reaches 78°F in a normal year. It peaks around 74°F in Aug. The air allows up to 6 swimmable months with a heater (Jun to Nov).
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What each heater buys you in El Segundo
| Option | Months | Swimmable | Energy/yr | All-in/yr |
|---|---|---|---|---|
| No heater | 0 | no month | $0 | $0 |
| Solar cover only | 2 | Aug to Sep | $0 | $50 |
| Solar panels + cover | 5 | Jun to Oct | $0 | $283 |
| Heat pump + cover | 6 | Jun to Nov | $427 | $977 |
| Gas heater + cover | 6 | Jun to Nov | $581 | $1,006 |
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 El Segundo
Solar panels + cover: 5 of 6 possible months for about $283 a year all-in, which works out near $57 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: Los Angeles International Airport, 2.9 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
El Segundo 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 | 66° | 58° | 3.1 | 58° | 64° | – | – |
| Feb | 66° | 58° | 4.0 | 59° | 65° | – | – |
| Mar | 66° | 59° | 5.2 | 61° | 67° | – | – |
| Apr | 68° | 61° | 6.3 | 63° | 69° | – | – |
| May | 70° | 64° | 6.6 | 66° | 72° | – | – |
| Jun | 72° | 66° | 6.3 | 68° | 74° | $106 | $146 |
| Jul | 75° | 70° | 6.6 | 72° | 78° | $43 | $62 |
| Aug | 77° | 71° | 6.3 | 74° | 80° | $9 | $13 |
| Sep | 77° | 70° | 5.5 | 73° | 79° | $20 | $29 |
| Oct | 74° | 67° | 4.3 | 70° | 76° | $75 | $104 |
| Nov | 71° | 62° | 3.4 | 65° | 71° | $174 | $227 |
| Dec | 66° | 58° | 2.8 | 60° | 66° | – | – |
Heating costs most in Nov (about $174 with a heat pump, $227 with gas). Sunshine peaks in Jul at 6.6 kWh/m²/day (NASA satellite data, 46.2 km grid cell). Highlighted months are swimmable with no heater.
How El Segundo compares with nearby cities
El Segundo ranks 285 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 |
|---|---|---|---|---|
| Manhattan Beach, CA | 1 mi | 0 | 6 | $427 |
| Hermosa Beach, CA | 3 mi | 0 | 6 | $555 |
| Lawndale, CA | 4 mi | 0 | 7 | $455 |
| Hawthorne, CA | 4 mi | 0 | 7 | $455 |
| Redondo Beach, CA | 4 mi | 0 | 6 | $555 |
| Inglewood, CA | 6 mi | 0 | 7 | $455 |