Pool swim season in Los Alamitos, CA
When can you swim in an outdoor pool in Los Alamitos, CA?
An unheated pool in Los Alamitos never reaches 78°F in a normal year. It peaks around 77°F in Aug. The air allows up to 8 swimmable months with a heater (Apr to Nov).
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Heater options for a Los Alamitos pool, side by side
| Option | Months | Swimmable | Energy/yr | All-in/yr |
|---|---|---|---|---|
| No heater | 0 | no month | $0 | $0 |
| Solar cover only | 4 | Jul to Oct | $0 | $50 |
| Solar panels + cover | 7 | Apr to Oct | $0 | $283 |
| Heat pump + cover | 8 | Apr to Nov | $566 | $1,116 |
| Gas heater + cover | 8 | Apr to Nov | $757 | $1,182 |
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 Los Alamitos
Solar panels + cover: 7 of 8 possible months for about $283 a year all-in, which works out near $40 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: Long Beach Daugherty Airport, 5 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
Los Alamitos 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 | 67° | 57° | 3.1 | 57° | 63° | – | – |
| Feb | 67° | 58° | 4.0 | 58° | 64° | – | – |
| Mar | 69° | 60° | 5.2 | 61° | 67° | – | – |
| Apr | 71° | 63° | 6.3 | 65° | 71° | $182 | $239 |
| May | 73° | 66° | 6.6 | 68° | 74° | $119 | $162 |
| Jun | 76° | 69° | 6.3 | 70° | 76° | $65 | $92 |
| Jul | 81° | 73° | 6.6 | 75° | 81° | – | – |
| Aug | 83° | 74° | 6.3 | 77° | 83° | – | – |
| Sep | 82° | 73° | 5.5 | 76° | 82° | – | – |
| Oct | 78° | 68° | 4.3 | 72° | 78° | $35 | $50 |
| Nov | 73° | 62° | 3.4 | 66° | 72° | $165 | $214 |
| Dec | 67° | 57° | 2.8 | 59° | 65° | – | – |
Heating costs most in Apr (about $182 with a heat pump, $239 with gas). Sunshine peaks in Jul at 6.6 kWh/m²/day (NASA satellite data, 52.3 km grid cell). Highlighted months are swimmable with no heater.
How Los Alamitos compares with nearby cities
Los Alamitos ranks 220 of 376 California cities for unheated swim months; Cypress, Stanton, La Palma nearby get a longer season without a heater.
| City | Distance | Unheated months | Heat pump months | Heat pump $/yr |
|---|---|---|---|---|
| Cypress, CA | 2 mi | 2 | 9 | $676 |
| Hawaiian Gardens, CA | 2 mi | 0 | 8 | $566 |
| Seal Beach, CA | 3 mi | 0 | 8 | $566 |
| Stanton, CA | 4 mi | 2 | 9 | $635 |
| La Palma, CA | 4 mi | 2 | 9 | $676 |
| Cerritos, CA | 5 mi | 2 | 9 | $676 |