Pool Temperature Forecast — 10-Day Pool Water Temp Prediction

A physics-based outlook for your pool — free 10-day forecasts, with Pro for heaters, covers, and saved profiles.

10-day water temps
Local weather-driven
Pro: heaters & covers
Pro: saved profiles

Setup

Your pool

A few details unlock a week-and-a-half of water temperature outlook.

Saved profiles

Location

Starting water temperature

Current water temp (°F)

Pool size

Average depth (ft)

Surface area

Length (ft)

Width (ft)

Pool type

Cover Pro

Sun exposure

Wind is modeled for a typical fenced yard.

Heater Pro

Type

Outlook

10-day water outlook

Today’s water —

Coolest —

Warmest —

10-day change —

Physics estimate from a day/night heat balance with fenced-yard wind. Rain uses wet-bulb drop temperature plus storm surface mixing. Heaters add energy after weather losses.

Water temperature

Pool vs air high–low

Day by day

Weather · water trend

Pro tools

Leak check · party heat plan

Evaporation & level drop

Estimated water-level change from evaporation (and rain gain). Compare to a bucket test: if your pool drops much faster than this while weather matches, a leak is more likely.

Avg / day —

10-day total —

Net w/ rain —

Day	Evap loss	Rain gain	Net level

Level drop assumes a vertical-walled surface. Steps, beaches, and splash-out are not included. This is an estimate, not a certified leak diagnosis.

Cover cost comparison

Same heater plan with different covers — estimated 10-day energy cost to run as configured (set point or fixed hours). Lower heat loss usually means fewer heater hours and lower cost.

Cover	End temp	Heater hours	Est. cost

Party heat planner

Pick a day and target water temp. We’ll suggest when to start heating so you hit the goal without running the heater hard all week (especially before a hot weather swing).

Event day

Target water (°F)

Uses your Pro heater settings above. Set type, size, and leave control on “Hold set point” or we’ll plan with set-point mode.

Forecast awaits

Your perfect swim window is a forecast away

Enter your pool and location — we’ll blend local weather with pool physics so you can plan the warmest days, not guess them.

See how covers and sun shift the water
Test heater hours or a set point
Save profiles for every backyard

Guide

Pool temperature forecast — how it works

Get Pool Temp is a free pool water temperature predictor for homeowners. Enter your pool and location for a physics-based 10-day pool temperature forecast driven by local weather—not a single national average.

How the physics model works

The outlook is a day/night heat balance on your pool’s water mass. Each half-day we estimate energy gains and losses from:

Sun — shortwave solar into the water (reduced by shade and some covers)
Air & humidity — convection and evaporation (or condensation)
Wind — typical fenced-yard exposure (stronger wind cools open water faster)
Night sky / longwave — radiative cooling when the sky is clear
Rain — cooler storm water and surface mixing (covers intercept most drops)
Heater (Pro) — extra energy after weather losses, for hours/day or a set point

Weather comes from Open-Meteo. Results are a planning estimate: real yards, imperfect covers, and splash-out can differ. Full write-up: how pool water temperature is predicted.

What inputs matter most

Starting water temperature — A recent thermometer reading beats a pure weather spin-up. Use “Estimate from weather” only when you do not know today’s temp.
Location — City, ZIP, or “Near me” sets the local forecast that drives the model.
Volume (depth × surface area) — Deeper or larger pools change more slowly after a cold night or heat wave.
Sun exposure — Full sun vs heavy shade can shift the whole 10-day water curve.
Cover & heater (Pro) — Solar covers cut evaporation; heaters add controlled warmth for parties or cool stretches.

Try the free 10-day forecast

Example outlooks by climate pattern

Illustrative patterns—not live forecasts. Run the tool with your pool for numbers that match your weather.

Humid Midwest summer

Warm days and muggy nights often hold water in the high 70s–low 80s °F once the pool is up. A cold front with wind and rain can drop open water a few degrees over a long weekend; a solar cover usually softens that dip.

Dry Southwest desert

Strong sun heats water by day, but low humidity and clear nights increase evaporation and radiative loss. Open pools can swing more day-to-day than humid climates; covers often matter more for overnight hold.

Coastal marine layer

Cool mornings, cloud decks, and mild highs slow solar gain. Water may sit below “vacation brochure” temps until a sunny stretch arrives—handy to check before turning the heater on all week.

Shoulder season / cold night

After a clear cold night, shallow water can feel much cooler the next morning even if the afternoon air recovers. Use the forecast to see whether the next few days rebound on their own before you heat for a Saturday swim.

Pool temperature FAQ

How does the pool temperature forecast work?

Get Pool Temp runs a day/night heat-balance model for your pool. It starts from your current (or estimated) water temperature, then updates the water each half-day using local weather—solar energy, air temperature, humidity, wind, clouds, and rain—plus your pool volume, sun exposure, and optional cover or heater settings.

Is this a free pool temperature predictor?

Yes. The core 10-day pool water temperature forecast is free. Pool Temp Pro adds heater scenarios, cover modeling, evaporation tools, a party heat planner, and saved profiles for a small monthly or yearly fee.

How accurate is a pool water temperature prediction?

It is a physics estimate, not a lab measurement. Accuracy improves when you enter a recent measured water temperature, realistic dimensions, and sun exposure. Weather forecasts change, and real yards vary (wind breaks, splash-out, imperfect covers), so treat results as a planning outlook rather than a guarantee.

What pool details matter most for the forecast?

Starting water temperature, location (for local weather), average depth and surface area (volume), and sun exposure matter most. Covers and heaters can change the outlook by several degrees when you model them with Pro features.

Will a pool cover make my water warmer?

Often yes. Solar and bubble covers reduce evaporation and heat loss and can still pass some sunlight. Solid covers cut evaporation more but block most solar gain. How much warmer depends on weather, nights, wind, and how well the cover seals—use the forecast tool with cover options to compare.

When should I turn on my pool heater?

Use the free forecast to see if weather alone will warm the water enough for your plans. If you need a target temperature for a party or cool stretch, Pro heater modeling and the party heat planner help you estimate run hours or a set point so you do not heat harder than necessary early in the week.

What is an ideal swimming pool temperature?

Most recreational swimming feels comfortable around 78–82°F (26–28°C). Competitive swimming is often cooler (about 77–82°F). Young children, therapy, and hot-tub-like lounging may prefer warmer water. Personal preference and air temperature still matter—use the forecast to see which days hit your comfort range.

More depth: all pool temperature guides · ideal swim temps · covers · when to heat · heating costs