When’s the Best Time to Water Grass?

a water sprinkler watering a lawn

The best time to water grass is in the morning before 10 am. At this time the air temperature is cooler, the sun is not yet high in the sky, and winds tend to be calmer. This allows time for the water to soak into the soil and be absorbed by the grass without being evaporated. Below we cover everything you need to know about when’s the best time to water grass.

Water Needs to Soak Into the Soil

Watering early in the morning has two advantages. It allows plenty of time for the water to soak deep into the soil before it begins to evaporate in the midday sun. And, it allows the grass time to dry and helps prevent fungal infection – more on this below.

Water Deeply & Infrequently

To keep your grass healthy and well watered you should aim to water anytime between 4 am and 10 am in the morning. You should also water deeply and less frequently. This means you should add plenty of water less frequently rather than watering a little more regularly. Deep infrequent watering encourages grass roots to grow deeply in search of water.

How to Avoid Grass Fungal Disease

Watering in the morning also allows time for the grass blades to dry during the day. This helps prevent fungal infections that can damage the grass. Watering grass in the evening or at night is not a good idea.

This does not allow enough time for the grass to dry. Air temperature begins to drop in the evening and if the grass is wet it may remain wet throughout the night until the next day. And, wet grass can lead to nasty fungal diseases.

When’s the Second Best Time to Water Grass?

watering grass using a garden hose

If you can’t water your lawn before 10 am, when is the next best time to water? The next best time to water is between 4 pm and 6 pm. This avoids the hottest part of the day when most of the water will be lost to evaporation. And, it allows time for the grass to dry before night kicks in. Don’t water your grass after 6 pm as this will not allow enough time for the grass blades to dry and leave them prone to infection and disease.

How Much Water Should You Use?

Most lawns need about 1.0 to 1.5 inches of water per week. The best approach is to apply the water in either one or two sessions over the course of the week. Watering any more regularly than this stunts the growth of the grass roots as they do not have to dig deep into the soil in search of water.

lady making a hand gesture and smiling

How Do You Know When to Stop?

How do you know when you’ve applied enough water? Let’s face it, you will not be able to measure out 1.0-1.5 inches of water as you water your lawn. So, an easy of knowing if the grass has received enough moisture is to test the soil it is growing in.

Get a dry stick and push it into the soil until it is at least 8 inches deep. Then slowly withdraw it and measure the depth of moisture on the stick. If the stick shows signs of moisture between 6-8 inches of depth – you’ve added enough water and it’s time to stop.

How Many Times per Week Should You Water?

The best approach is to water your grass – once or twice per week. Infrequent deep watering is better for the grass than regular shallow watering. By watering the grass less regularly you encourage the roots to grow deep into the soil in search of water.

sprinklers watering grass

This results in stronger, healthier grass. Regular shallow may appear more caring but it can stunt the development of the grass. For best results, add plenty of water once or twice every week – early in the morning.


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What’s the Best Time to Water Grass in the Summer?

The best time to water grass in the summer is between 4 am and 10 am. This gives the water time to soak into the soil and become available to the roots of the grass. You should avoid watering grass after 10 am during the summer as this will be the start of the hottest time of the day.

summer garden

When the air temperature rises and the sun is high in the sky evaporation becomes an issue. Under these conditions, a lot of the water is lost to evaporation as it rises into the air as water vapor. It just doesn’t get a chance to soak down into the soil.

If you are unable to water your lawn before 10 am during summer months, wait until after 4 pm. This is when the day begins to cool down and the sun lowers in the sky. There is a window between 4 pm and 6 pm you should aim for to water your lawn. However, if you miss this window wait until the next day. Do not water grass after 6 pm.

How Do You Know If Your Lawn Is Getting Enough Water?

What are the telltale signs that a lawn is not getting enough water? When covering ‘when’s the best time to water grass’ – we need to be able to tell if grass is getting enough water.  The good news is, it doesn’t take an experienced gardener to figure out if a lawn is not getting enough.

water with bubbles

There are some very simple signs you should look out for that will tell you your grass is feeling thirsty.  First up, has the lawn lost some of its lush green color? If the grass turns a less vibrant shade of green this is a clear sign the lawn is in need of some water. Another indicator is curled-up grass blades.

When grass blades become dehydrated they begin to curl up and have a dry and husky appearance.  And, a final sign that grass urgently needs water is if it loses its springy nature. If you walk across the grass and it doesn’t bounce back into position as you lift your foot then you need to get the hose or the sprinkler out – it needs watering.



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How Much Water Evaporates From a Pool?

swimming pool at sunset

Between 1/4 inch to 1 inch of water evaporates from a pool every day. The amount of water that evaporates is affected by air temperature, exposure to sunlight, wind speed, humidity, and the size of the pool. This article covers everything you need to know about how much water evaporates from a pool.

Does Pool Water Evaporate?

How Does It Evaporate?

Pool Water Evaporation Rate

How Much Evaporation Is Normal?

How to Stop Water Evaporating

Is it Evaporation or a Leak?


people playing in a pool

Yes, pool water evaporates. Pool water evaporates due to its exposure to heat and wind. Water evaporates more quickly from pools in hot and dry weather conditions. Pools located in hot dry climates with plenty of sunshine will experience the most evaporation. However, wind plays a significant role too, see below.


As water molecules in pool water absorb heat from the sun they become energized and begin to vibrate. These energetic water molecules change from liquid form to gas. The gas molecules rise into the air above the pool as water vapor.

lifeguard standing next to a pool

Wind plays an important role in pool water evaporation. Wind increases the speed of evaporation by sweeping away the water vapor as it gathers over the pool.

In the absence of wind, the water vapor will hover above the pool like a blanket and will slow down the evaporation process. Wind removes this water vapor film and allows a new blanket to take its place.

Other factors that play a role in pool water evaporation are humidity, sunlight, and pool size & shape. Let’s take a look at how each of these impact pool water evaporation.


Temperature plays one of the most significant roles in the evaporation of water from a pool. As temperature increases, so too does the rate of evaporation. As water molecules in the pool absorb heat they become excited and begin to escape as water vapor.

Pools in dry hot climates that are exposed to direct sunlight experience the most water evaporation. The higher the temperature, the more heat, and the more water evaporates as water vapor. Note, pool water also evaporates in cooler climates but at a much lower rate.


Wind has a significant impact on how much water evaporates from a pool. Wind removes the humid air above the pool that contains water vapor and replaces it with dry air. This dry air then absorbs fresh water vapor from the pool surface. And this cycle repeats itself as wind sweeps away this humid air.

Pools situated in areas with little shelter experience the highest levels of wind evaporation. Windbreakers or walled enclosures are great ways of protecting a pool from the evaporative effects of wind.


Humidity plays a big role in how much water a pool loses to evaporation. The higher the level of humidity in the air, the lower the amount of evaporation that occurs. This is because humid air already contains a high level of moisture and has a reduced ability to absorb water vapor. On the other hand, dry air with low humidity is very effective at absorbing water vapor.


Exposure to direct sunlight is a contributing factor to pool water evaporation. Pools that are directly exposed to sunlight heat up more quickly than pools situated in shaded areas.


The size and shape of a pool plays a role in how it loses water to evaporation. Specifically, pools with a larger surface area experience the greatest level of evaporation.

Why is that?  Larger surface areas mean more water is exposed to direct sunlight and the movement of dry air. This speeds up the rate of evaporation. On the other hand, deep pools with relatively low surface areas experience less evaporation.


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What is pool water evaporation rate? Pool water evaporation rate is the rate at which pool water transforms to water vapor and leaves the pool in gaseous form. It results in a loss of water volume and can be noticed as the water level slowly falls. Pool water evaporation rate is calculated by measuring the change in water level over a time period.  And, it’s very simple – see below.

still swimming pool behind a house


Calculating pool evaporation rate is easy. All you have to do is measure the drop in water level over 24 hours and calculate the evaporation rate in inches per day. You can do this by marking the top of the water level with a piece of tape. Then, repeat the process 24 hours later.

The difference between the two marks indicates the drop in water level over those 24 hours. Repeat the process over a larger time period and calculate an average for a more accurate value. This gives you a pool evaporation rate average in inches per day.


• (Water Mark Day 1) – (Water Mark Day 2) = Evaporation Rate (inches)


How much water does a pool lose to evaporation? How much water evaporates from a pool each day?  A pool normally loses between 1/4 inch to 1 inch of water to evaporation each day. Pools located in hot, dry climates with a breeze and lots of sunlight will experience more evaporation than pools in cool, humid climates.

a pool of water

An average-sized rectangular pool measuring 16′ x 32′ feet with an average depth of 4 feet will lose 1 inch of water per day in a hot, dry, and sunny climate. A similar pool located in a milder climate with a greater level of humidity can expect to lose 1/4 inch of water per day. This is the normal evaporation for an average-sized pool based on climate conditions.


There are several methods you can use to reduce the rate of evaporation from a pool. Although it may not be possible to completely stop the evaporation process there are some simple steps you can take to greatly reduce it. Evaporation is a natural process and your aim should be to minimize it, not completely stop it.

woman sitting at edge of a pool

Use a Pool Cover

A pool cover is the best way to reduce water evaporation from a pool. When not in use, place a cover across the pool. A cover not only reduces evaporation but also keeps debris from falling into the pool. There is a range of cover types on the market. You can choose from solid, mesh, and automatic covers that operate using a timer.

Use a Windbreak

A windbreak is another great device for reducing pool water evaporation. A windbreak can include a row of trees, a hedge, a screen, or a wall. These create a physical barrier to prevailing wind and protect the pool surface from wind evaporation.

Lower Pool Temperature

You can reduce the rate of evaporation by lowering the temperature of the pool. If you have a heated pool, simply reduce the pool temperature by a couple of degrees. The cooler water will be more resistant to evaporation. If you have no temperature control, you can place a shade above the pool for a similar effect.

Reduce Pool Usage

Another effective method of reducing evaporation is to reduce pool usage. The more a pool is used, the greater the level of evaporation. Motion in the water facilitates the evaporation process by encouraging the escape of water vapor from the water’s surface.

Add a Pool Cover Liquid

A pool liquid cover is a chemical you can add to the pool that creates a liquid barrier on the surface of the pool. This cover reduces evaporation and performs in a similar way to a regular physical pool cover. Liquid covers are made from non-toxic substances and are safe to swim in.


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Have you considered a pool leak? It can be difficult to tell if a pool is losing water due to evaporation or a pool leak. If the pool is losing more than 1” inch per day you should investigate for the presence of a leak.

water droplets on a pool of water

How to Detect a Leak in a Pool

There are several methods you can use to detect a pool leak. The most popular are the dye test and bucket test. Below we cover all the methods available for detecting a pool leak.

Dye Test

This is one of the simplest and most effective methods of detecting a pool leak. Simply, turn off the pool pump and filtration system and add some food coloring to the pool. Then, stand back and observe the movement of the colored water. Is it moving towards a specific point? If it is, this is a clear sign of the presence of a leak.

Bucket Test

Grab a bucket and fill it with water. Place it next to the pool surface and mark the water level on side of the bucket. Also, mark the pool water level by pacing some tape on the side of the pool in line with the top of the watermark. Wait 24 hours. Then measure the drop in water level for the bucket and the pool. If the pool water has dropped more than the bucket level, there may be a leak.

Pool Equipment Inspection

Take a look at all the pool equipment. Inspect the water pump, pool filter, heater, and all pipework for signs of a leak or drip. If you find any, you’ve located the leak.

Listen For Sounds

If you have a big leak you should be able to hear some unusual sounds. Stand on the edge of the pool and listen out for unusual hissing or gurgling noises. These could be the noises of water leaving the pool unexpectedly.

Hire a Professional

If you’ve tried the above steps and cannot locate the source of the pool leak, it’s time to get a professional in. These people use specialized equipment to detect and locate pool leaks, including electronic high-precision listening devices to pinpoint water leaks.


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