When temperatures rise, it's not just us who feel the heat.

Ponds can warm up surprisingly quickly during hot weather, particularly smaller ponds and those exposed to full sun. As water temperatures increase, oxygen levels naturally fall, putting extra pressure on fish, amphibians and other pond life.

The good news is that a few simple steps can make a real difference.

Increase Surface Cover And Shade

If there is one thing that helps ponds during hot weather, it's shade.

Direct sunlight warms the water, encourages algae growth and can make conditions uncomfortable for wildlife. Waterlilies are excellent for creating natural shade, while floating plants such as Frogbit and Water Lettuce can quickly help cover exposed areas of water.

As a general guide, aiming for around 50–70% surface coverage during summer can help keep water temperatures more stable.

If your pond sits in full sun all day, don't be afraid to create temporary shade during the hottest part of the afternoon. A garden parasol, patio umbrella or temporary shade sail can help protect part of the pond from intense sunlight. This can be particularly useful for smaller ponds that warm up quickly during prolonged periods of hot weather.

Keep An Eye On Oxygen Levels

Warm water naturally holds less oxygen than cool water, which can place additional pressure on fish and other pond life during hot weather.

A well-planted pond is often far more resilient than a sparsely planted one, with oxygenating plants helping support healthy oxygen levels beneath the surface.

If your pond tends to struggle during hot weather, a small solar fountain or solar air stone can be a simple and effective addition. These are quick to install, increase water movement and help improve oxygen exchange without needing mains power.

Top Up Water Levels Carefully

Hot weather can cause water levels to fall surprisingly quickly.

If possible, use collected rainwater to top up your pond. Small fluctuations in water level are perfectly natural, particularly in wildlife ponds, and rarely need immediate attention.

If you do need to use tap water, add it gently. Avoid spraying water directly onto pond plants or disturbing the pond with a strong jet from a hose. Instead, allow the water to flow slowly into one corner of the pond where it can mix gradually, minimising disturbance to wildlife, sediment and aquatic plants.

Leave Wildlife Shelter In Place

Hot weather is not the time for major pond tidying.

Overhanging marginal plants, floating leaves and dense pond-edge vegetation all provide valuable shade and shelter for wildlife. Young froglets in particular often use these areas for protection as they move between water and land.

What can sometimes look overgrown to us may be providing refuge for frogs, newts, dragonflies and countless smaller pond creatures.

Unless a plant is genuinely overwhelming the pond or crowding out neighbouring plants, summer is often a good time to leave well alone and let wildlife make use of the cover.

Remove Blanket Weed Little And Often

Warm weather can encourage blanket weed growth.

If it starts becoming excessive, remove small amounts regularly rather than leaving it until it becomes a major problem.

Always remove blanket weed over a bucket or container and take a moment to check through what you have removed. It is surprising how many pond creatures can become tangled within it, including snails, beetles, pond larvae and other small aquatic life.

Once removed, leave the blanket weed beside the pond for a day or two before composting. This gives any overlooked wildlife the opportunity to crawl, wriggle or make its way back into the water.

Don't Panic

A little algae, slightly lower water levels and strong plant growth are all normal during summer.

The healthiest ponds are rarely the neatest. Waterlily leaves, floating plants, oxygenators and marginal vegetation all help create a cooler, more stable environment for wildlife during hot weather.

Rather than trying to control every aspect of the pond, focus on keeping it shaded, well planted and topped up when needed. Often the best thing we can do during a heatwave is support the pond's natural balance and let nature do much of the work itself.

Water Lettuce: A Quick Note

Water Lettuce is a fantastic plant for providing fast summer shade and helping cover exposed water.

However, it is not hardy in the UK and will die once temperatures fall below around 5°C in autumn. Most pond owners treat it as an annual plant.

Water Lettuce is classed as an invasive species in parts of Europe, but it does not typically survive UK winters outdoors. Even so, unwanted plants should always be composted responsibly and never released into the wild, rivers, streams or natural ponds. Responsible disposal helps protect native habitats and prevent the spread of non-native species.