The short answer
Yes — artificial grass heats up in direct sunlight noticeably more than a real lawn. Natural grass cools itself by drawing up and evaporating water, whereas synthetic fibres absorb and hold heat, so on a hot, sunny day an artificial lawn can become uncomfortable or even too hot for bare feet and pets' paws. The effect is most pronounced during the strongest summer sun and on dark or dense piles. In the UK's generally mild climate it is a comfort issue on a handful of hot days rather than a constant problem, and it is easily managed: a quick hose-down cools the surface fast, and shade, lighter-coloured grass and avoiding peak sun all help.
This is one of the most common concerns about artificial grass, and it is a real effect rather than a myth. The good news is that it is intermittent in the UK and straightforward to manage.
Artificial grass and heat
- Heats up vs real grassYes — markedly hotter in direct sun
- WhyNo evaporative cooling; fibres absorb heat
- UK frequencyOnly on hot, sunny days
- Quick fixHose down to cool fast
- HelpsShade, lighter pile, avoiding peak sun
Why it heats up more than real grass
The difference comes down to how each surface deals with the sun's energy. A natural lawn keeps itself cool through transpiration — it draws water up from the soil and releases it through the blades, and that evaporation carries heat away, much like sweating. The soil beneath also stays cooler and damper.
Artificial grass has no such mechanism. Its plastic fibres and backing absorb solar energy and have nowhere to shed it, so the surface temperature climbs in direct sun and stays warm until the sun moves off or it is cooled. Darker and denser piles absorb more heat than lighter, more open ones. The sand infill and the base beneath also store warmth. The result is a surface that can feel hot to the touch on a bright summer day, well above the temperature a real lawn would reach in the same conditions.
How much of a problem is it in the UK?
In the UK's temperate climate, the heat issue is occasional rather than constant. It matters on genuinely hot, sunny days — the kind the UK now sees more of in summer heatwaves — and far less the rest of the time. The practical concerns are:
- Bare feet: the surface can become uncomfortable or too hot to walk on comfortably during peak sun.
- Pets' paws: dogs in particular can find a sun-baked artificial lawn too hot, so it is worth checking the surface with your hand before letting them out on the hottest afternoons.
- Children playing: youngsters playing on the grass in summer may need the surface cooled or shaded first.
- Reflected warmth: a large artificial lawn in full sun can add to the warmth of an enclosed garden on a hot day.
Practical ways to keep it cooler
The heat is manageable with a few simple measures, none of which is costly:
- Hose it down: a brief spray with water cools the surface quickly and is the fastest fix on a hot day. The effect lasts a while but will return as the sun reheats it.
- Add shade: a parasol, sail shade, pergola, tree or fence that throws shade over part of the lawn keeps that area much cooler. Shaded artificial grass does not overheat.
- Choose a lighter pile: at the buying stage, a lighter-coloured, less dense grass absorbs less heat than a very dark, dense one — worth considering for a sunny, exposed garden.
- Time outdoor use: morning, late afternoon and evening are cooler than the midday-to-mid-afternoon peak, when the surface is hottest.
- Mind the layout: if you are planning a new lawn, keeping seating and play areas where they catch some shade reduces the impact.
Overall, artificial grass does get hotter than a real lawn in summer sun, and that is worth knowing before you choose it for a hot, exposed garden. But in the UK it is a manageable, intermittent issue — a hose-down and a bit of shade handle it on the days it matters.
Planning for heat at the design stage
If you are choosing artificial grass for a sunny garden, some decisions made before installation can reduce how hot the surface gets and how much it matters in use. Thinking about heat at the design stage is more effective than managing it afterwards:
- Pile colour and density: a lighter-toned, less dense grass absorbs less solar energy than a very dark, heavy pile. For an exposed, south-facing garden this is a worthwhile trade-off, even if a darker grass looks slightly more lush.
- Position of seating and play: placing the areas where people sit or children play where they catch shade from a tree, wall, fence or building keeps those spots usable through the hottest part of the day.
- Permanent shade features: a pergola, sail shade or strategically placed planting can throw shade across the lawn at midday, when the sun is strongest, without making the garden feel dark.
- Mixing surfaces: keeping some living planting, a border or a patio area alongside the artificial lawn gives cooler spots and reduces the total area of heat-absorbing surface in an enclosed garden.
- A nearby water source: an outdoor tap close to the lawn makes the quick hose-down that cools it effortless on hot days.
None of this eliminates the basic fact that artificial grass warms up in sun, but together these choices keep the effect to a minimum and ensure the garden stays comfortable to use. For most UK gardens, where genuinely hot days are limited to part of the summer, a sensible grass choice, some shade over the key areas and an easy way to rinse the surface are enough to make heat a minor consideration rather than a reason to avoid artificial grass altogether.
Frequently asked questions
Can artificial grass get hot enough to burn skin or paws?
On a very hot, sunny day the surface can become uncomfortably hot and, in extreme conditions, hot enough to be a problem for bare skin or pets' paws. It is sensible to test it with the back of your hand before children or dogs use it, and to cool it with water or use a shaded area on the hottest afternoons.
Does watering artificial grass to cool it work?
Yes. A brief hose-down lowers the surface temperature quickly and is the simplest way to cool it on a hot day. The cooling is temporary — the sun will reheat the surface over time — but it is effective and uses little water compared with keeping a real lawn green in a dry spell.
Does the colour or type of grass affect how hot it gets?
It does. Darker, denser piles absorb and hold more heat than lighter, more open ones. If your garden is sunny and exposed, choosing a lighter-coloured, less dense grass and planning some shade over seating and play areas will keep the surface cooler in summer.
Sources & further reading
- Which? — artificial grass pros and cons
- Royal Horticultural Society — artificial lawns
- RSPCA — keeping pets safe in hot weather
Figures on this page are typical UK ranges drawn from published cost guides and are intended as guidance, not a quotation.