Pool swim season in Murrieta, CA
When can you swim in an outdoor pool in Murrieta, CA?
An unheated pool in Murrieta reaches 78°F in Aug to Sep, about 2 months a year. The air allows up to 9 swimmable months with a heater (Mar to Nov).
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Heater options for a Murrieta pool, side by side
| Option | Months | Swimmable | Energy/yr | All-in/yr |
|---|---|---|---|---|
| No heater | 2 | Aug to Sep | $0 | $0 |
| Solar cover only | 4 | Jul to Oct | $0 | $50 |
| Solar panels + cover | 8 | Apr to Nov | $0 | $283 |
| Heat pump + cover | 9 | Mar to Nov | $817 | $1,367 |
| Gas heater + cover | 9 | Mar to Nov | $1,061 | $1,486 |
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 Murrieta
Solar panels + cover: 8 of 9 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 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: Fallbrook 5 NE, 9.3 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
Murrieta 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 | 68° | 57° | 3.2 | 57° | 63° | – | – |
| Feb | 67° | 57° | 4.1 | 58° | 64° | – | – |
| Mar | 70° | 59° | 5.4 | 60° | 66° | $282 | $352 |
| Apr | 72° | 61° | 6.5 | 64° | 70° | $205 | $264 |
| May | 75° | 64° | 6.9 | 67° | 73° | $140 | $188 |
| Jun | 81° | 68° | 7.3 | 71° | 77° | $63 | $89 |
| Jul | 87° | 74° | 7.4 | 75° | 81° | – | – |
| Aug | 89° | 76° | 7.1 | 79° | 85° | – | – |
| Sep | 88° | 75° | 6.0 | 78° | 84° | – | – |
| Oct | 83° | 71° | 4.6 | 74° | 80° | – | – |
| Nov | 74° | 63° | 3.6 | 67° | 73° | $127 | $168 |
| Dec | 67° | 57° | 2.9 | 60° | 66° | – | – |
Heating costs most in Mar (about $282 with a heat pump, $352 with gas). Sunshine peaks in Jul at 7.4 kWh/m²/day (NASA satellite data, 29.8 km grid cell). Highlighted months are swimmable with no heater.
How Murrieta compares with nearby cities
Murrieta ranks 185 of 376 California cities for unheated swim months; Wildomar, Menifee, Canyon Lake nearby get a longer season without a heater.
| City | Distance | Unheated months | Heat pump months | Heat pump $/yr |
|---|---|---|---|---|
| Wildomar, CA | 5 mi | 3 | 9 | $772 |
| Temecula, CA | 7 mi | 2 | 9 | $817 |
| Menifee, CA | 8 mi | 3 | 9 | $772 |
| Canyon Lake, CA | 9 mi | 3 | 9 | $772 |
| Lake Elsinore, CA | 11 mi | 3 | 9 | $772 |
| Perris, CA | 15 mi | 3 | 9 | $1,126 |