PoolCast

Stop guessing whether the water's warm enough. PoolCast forecasts your swimming pool's water temperature for the next 7 days — from real weather data and pool physics, with no thermometer, sensor or smart device required. Most pool apps make you buy a probe or a connected heat pump first. PoolCast doesn't. Tell it where your pool is and a few details about it, and you get a temperature forecast you can plan around — plus an honest estimate of what it costs to heat. WHY POOLCAST • No hardware. No sensor, no probe, no connected device — just your phone. • A real forecast, not a thermometer. See today and the next 7 days. • Know before you heat. See the daily running cost for your heater so you never waste money or gas. • Built on physics. PoolCast models sunlight, air temperature, wind, humidity, evaporation and rain — the same energy balance that actually heats and cools your pool. WHAT YOU GET • A 7-day pool water temperature forecast for your exact location • "Should I heat?" — the daily heating cost for electric, heat-pump or gas heaters, with honest COP-based math • A clear "warm enough to swim?" read at a glance • Cover savings — see how much a pool cover would save you each week • A beautiful temperature chart and a day-by-day outlook • °C/°F, metric/imperial, wind units and currency — set automatically for your region, changeable any time • Tune it to your pool: surface area, depth, shade, cover and heater • Made for phones and tablets, light on battery, gorgeous in dark mode HOW IT WORKS PoolCast pulls hourly weather for your location and runs a thermal model of your pool: how much solar energy it absorbs, how fast it loses heat to cool air and wind, and how much evaporation cools the surface. The result is a temperature curve for the week ahead — and if you have a heater, exactly what it will cost to reach your target. PERFECT FOR • Pool owners deciding when — and whether — to swim • Anyone with a heater who wants to cut their heating bill • Holiday-home and rental owners getting the water ready for guests • Swimmers and families tired of jumping into a cold pool PoolCast is free, and there's no account to create. Your location is used only to fetch the forecast.