How to Save Water with Timers and Sprinklers During a Heatwave
When temperatures climb, lawns and gardens can lose moisture quickly. Homeowners often jump straight to a lengthier, more frequent watering schedule — but all that extra water may not actually mean healthier plants. Applying water too quickly, at the wrong times, or outside the areas that actually need it can lead to high water bills without benefiting your lawn and gardens.
A well-placed sprinkler and a dependable timer can help you water more efficiently, protect your landscape, and avoid wasting water during periods of extreme heat. Read on, and we’ll show you how to water the right way during a heatwave.
Quick Heatwave Watering Checklist
Before temperatures soar, make sure you're following these water-saving best practices:
- Water early in the morning.
- Water deeply to encourage strong roots.
- Break long watering sessions into shorter cycles.
- Let a watering timer handle the schedule.
- Match your sprinkler to the area you're watering.
- Check for dry spots, runoff, and overspray.
- Adjust watering for your soil type.
- Give priority to new plantings and containers.
- Skip watering after a soaking rain.
- Inspect your watering equipment regularly.
Water at the Right Time
Water Early in the Day
This is the first and most important thing to remember: the best time to water is generally early in the morning, when temperatures are cooler, and winds are calmer. This gives water time to soak into the soil before the hottest part of the day. It also reduces evaporation compared with afternoon watering, and it allows grass blades and plant leaves to dry during the day, which discourages disease and fungal problems.
The only time to ignore this rule is when plants are showing severe signs of heat stress. When you spot wilting or drooping plants, don’t wait until the next morning to water them.
Water Deeply Instead of Constantly
This is a rule you should follow all year round. Frequent, shallow watering keeps moisture near the soil surface and encourages shallow root growth. When summer’s heatwaves hit, plants with shallow roots run into problems. You’ll find yourself watering constantly because the upper layers of the soil dry out quickly, causing the plants to wilt.
Deep watering every few days, or even once a week, is the better option because it allows water to travel farther into the root zone, where it remains available longer. If you water deeply throughout spring and summer, plant roots will grow down to reach the water, and you’ll have fewer problems with browning and wilting during the hottest parts of summer.
The exception to this rule includes newly planted flowers, veggies, trees, and shrubs. These should be watered enough to keep the soil consistently moist for a week or two while their root systems establish themselves.
Use the Cycle-and-Soak Method
Dry or compacted soil may not absorb water as quickly as a sprinkler applies it, causing water to run off instead of soaking into the root zone. If you’re experiencing this problem, try dividing your total sprinkler time into shorter cycles. Water for several minutes, pause for a few minutes to let the moisture soak in, and then water again. A programmable timer can manage these intervals for you.
This cycle-and-soak method is especially helpful on slopes, in heavy clay soil, and in areas where water begins to pool or run toward the street.
Get Better Results from Your Equipment
Use a Watering Timer
It is surprisingly easy to turn on a sprinkler, step inside, and forget that the water is still running. It’s even easier to forget to turn the sprinkler on at all.
This is where watering timers provide the perfect solution. With a programmable timer, you can set up a watering schedule that ensures your lawn and gardens get early morning water without needing to get out of bed at sunrise. Adjust it to run for half an hour to an hour, depending on your sprinkler system’s flow rate, to prevent overwatering. From there, you can adjust the schedule as needed to account for the weather or changing plant needs.
Match the Sprinkler to the Space
When it comes to purchasing sprinklers, bigger isn’t always better. If you buy the sprinkler that offers the largest coverage area possible, there will be times when you’ll find yourself wasting lots of water by watering your driveway, the side of your house, and areas that don’t really need it.
It’s better to choose a sprinkler — or multiple sprinklers — that fit the size and shape of the areas that need to be watered.
- An oscillating sprinkler can provide even coverage across rectangular lawns and gardens.
- An impact or pulsating sprinkler may be a better fit for larger, more open areas.
- For small beds, narrow side yards, or irregular spaces, select a sprinkler with adjustable width, range, or pattern controls.
The closer the watering pattern matches the landscape, the less you’ll end up wasting water on sidewalks, fences, and driveways.
Test Your Coverage
Before leaving a sprinkler to run, watch it complete several passes. Look for dry corners, overly wet patches, blocked spray, and water reaching areas that don’t need watering. Reposition the sprinkler or adjust its controls until the intended area receives consistent coverage.
One trick to help you determine not only the coverage but also the amount of water an area receives over a given period is to place empty food tubs or similar shallow containers around the watering zone. After the sprinkler runs, you can measure the water levels to see how many inches per hour your system is delivering, and which areas are getting better or worse coverage.
Inspect Your Equipment
Small leaks can waste a surprising amount of water over time. Inspect hose connections, washers, sprinkler fittings, and timers regularly. Replace worn washers and tighten loose connections when you notice dripping. Clean sprinkler nozzles if mineral deposits or debris interfere with the spray pattern. Keeping watering tools in good condition helps direct more water toward plants rather than letting it drip or spray where it doesn’t need to go.
Adapt as Conditions Change
Adjust Watering for Your Soil Type
Different soils will hold water differently.
- Sandy soil drains quickly and may benefit from shorter, more frequent watering sessions.
- Clay soil absorbs water slowly but holds moisture longer once it is wet.
- Loamy soil usually falls somewhere in between.
To check how your soil is holding water, use a screwdriver or small gardening tool to make a small hole in the soil. At any given time, it should feel moist below the surface, but not muddy or waterlogged. Dry, crispy soil indicates that you need to water more, while muddy, waterlogged soil means you should cut back.
Focus Water Where It Matters Most
Not every part of the yard has the same watering needs. Newly planted trees, shrubs, flowers, and vegetables are usually more vulnerable to heat than established plants. Container gardens may also dry out quickly because they hold a limited amount of soil. Prioritize these areas when water is limited. Established lawns can often tolerate some temporary browning, while young or actively producing plants may suffer lasting damage if their roots become completely dry.
Watch the Weather and Plant Stress
A timer should support your watering routine, not place it on permanent autopilot. Check the forecast and pause scheduled watering when meaningful rain arrives. Inspect the soil each day and check for signs of plant stress, like curling leaves, drooping stems, or footprints that remain visible in the lawn. Yellowing grass, soggy soil, mushrooms, and standing water may indicate that an area is receiving too much water.
Keep Your Cool and Water Smarter
A heatwave can be tough on lawns, gardens, and the people caring for them. The goal is not to keep the soil constantly soaked. It is to deliver the right amount of water to the root zone with as little waste as possible. Water early, match the sprinkler to the space, divide watering into manageable cycles, and use a timer to keep the schedule under control. With a few thoughtful adjustments, you can help your plants beat the heat while making every drop count.
People Often Ask
How often should I water my lawn during a heatwave?
There is no single schedule that works for every lawn. During a heatwave, it's generally better to water deeply and less frequently rather than applying small amounts of water every day. Deep watering encourages stronger root growth and helps grass tolerate hot, dry conditions.
What is the best time to water during a heatwave?
Early morning is usually the best time to water. Cooler temperatures and calmer winds allow more water to soak into the soil before it evaporates. Morning watering also gives grass and plant leaves time to dry, which can help reduce disease problems.
Can a watering timer help save water?
Yes. A watering timer helps deliver water on a consistent schedule and reduces the chance of forgetting to turn a sprinkler off. Many timers also make it easy to water during the early morning, when watering is generally most efficient.
Which sprinkler wastes the least water?
The most water-efficient sprinkler is the one that matches the size and shape of the area you're watering. An oscillating sprinkler works well for rectangular lawns, while impact sprinklers are often better for large open spaces. Adjustable sprinklers help reduce overspray onto sidewalks and driveways.
What is the cycle-and-soak watering method?
The cycle-and-soak, or pulse-watering, method divides one long watering session into several shorter cycles with breaks in between. This gives water time to soak into the soil, reducing runoff and improving water absorption, especially in clay soils or on slopes. Some watering timers, such as the Melnor® HydroLogic® Eco Timer, let you schedule these watering intervals automatically.
Should I water plants that are wilting during the day?
Not always. Some plants temporarily wilt during the hottest part of the day and recover as temperatures cool. However, if plants remain wilted or show signs of severe heat stress, they should be watered rather than waiting until the next morning.
Can I leave my watering timer on the same schedule all summer?
No. Watering schedules should be adjusted as weather conditions change. Reduce or pause watering after significant rainfall, and monitor your lawn and garden for signs that plants need more or less water.