Can You Use a Hot Tub in Summer? Safety & Temperature Guide

Yes, you can use a hot tub in summer. The key is to lower the water temperature, choose a cooler time of day, stay hydrated and keep each soak relatively short. Many people find that water between approximately 29°C and 37°C feels more comfortable in warm weather, although the right setting depends on the outdoor temperature, the hot tub and personal preference. Hot tub water should never exceed 40°C.

A summer soak can still be a relaxing part of your routine, but the settings that feel comfortable on a cold winter evening may be too warm during a heatwave. This guide explains how to use a hot tub safely in hot weather, from choosing the right temperature to maintaining clean water when the tub is being used more frequently.

Quick answer: how should you use a hot tub in hot weather?

For a safer and more comfortable summer hot tub session:

• Lower the water temperature before use.
• Aim for a short soak of around 10 to 15 minutes to begin with.
• Drink water before and after getting in.
• Avoid alcohol before and during your soak.
• Use the hot tub in the morning or evening rather than during peak afternoon heat.
• Get out immediately if you feel dizzy, faint, nauseous or unusually hot.
• Test the water and clean the filters regularly, especially during periods of frequent use.

What is the best hot tub temperature in summer?

The best summer hot tub temperature is usually lower than a typical winter setting. While many adults enjoy a hot tub at approximately 37°C to 40°C in cooler weather, a setting between 29°C and 37°C may feel more refreshing when the air temperature is high.

There is no single temperature that suits every person or every day. A useful approach is to lower the thermostat gradually and test the water before getting in:

The ideal setting will also depend on what your model can achieve. Some hot tubs can maintain cooler water, while others can only stop heating and allow the water to cool naturally. Check the manufacturer’s instructions before changing operating modes.

For another useful reference point, O-Care’s guide to finding a comfortable summer hot tub temperature suggests that some users may prefer water between 29°C and 35°C during warmer weather.

Why does hot tub safety matter more in warm weather?

Hot water makes it harder for the body to release heat. When this is combined with high air temperatures and direct sunlight, you may become uncomfortably hot more quickly than expected.

The main risks include:

• Overheating: Warning signs can include dizziness, headache, nausea, weakness, confusion or feeling faint.
• Dehydration: You may sweat without noticing while sitting in the water, particularly on a hot day.
• Fainting and falls: Feeling lightheaded when standing up can increase the risk of slipping around the hot tub.
• Poor water quality: Warm water and heavier use can place more demand on the filtration and sanitising system.

Never treat a time or temperature recommendation as a target that must be reached. Leave the water as soon as you feel uncomfortable.

How long should you stay in a hot tub in summer?

Start with a soak of around 10 to 15 minutes when the weather is hot. You may need less time if the water is close to 40°C, the tub is in direct sun or you are particularly sensitive to heat.

It is safer to get out, cool down and reassess how you feel than to extend one long session. Sit in the shade, drink some water and allow your body temperature to return to normal before considering another soak.

The South West Spas guide to using a hot tub in summer also offers seasonal advice for making warm-weather use more comfortable.

How to prepare for a summer hot tub session

Lower the temperature in advance

Hot tubs cool much more slowly than they heat. Turn the thermostat down well before you plan to use the tub and confirm the actual water temperature with the display or a suitable independent thermometer.

Do not add ice unless the manufacturer confirms that it is safe for your model. A sudden temperature change or unbalanced untreated water may affect the system or water chemistry.

Choose a cooler time of day

Early morning and evening are usually more comfortable than the middle of the afternoon. If possible, create shade around the seating area, but keep temporary covers, parasols and electrical equipment safely positioned according to the manufacturer’s guidance.

Drink water

Drink water before getting into the hot tub and keep more nearby for afterwards. Avoid alcohol before and during use because it can impair judgement and may increase dehydration and fainting risk.

Check the water

Test the sanitiser level and pH before use, following the instructions for your hot tub and treatment products. Water that looks clear is not automatically hygienic.

Seven tips for using a hot tub safely in summer

1. Never exceed 40°C

Check the displayed temperature before entering. If you are unsure whether the built-in reading is accurate, use a suitable separate thermometer.

2. Begin with a short soak

Ten to 15 minutes is a sensible starting point in hot weather. Get out sooner if you feel too warm or unwell.

3. Keep your head and shoulders cool

Sitting slightly higher in the water, where the hot tub is designed to allow it, can help you feel more comfortable. Do not put your head underwater.

4. Take regular cooling breaks

Move to a shaded area, dry off and drink water. Avoid going directly from intense heat into an extreme cold treatment unless you have suitable professional or medical advice.

5. Do not soak alone if you feel unwell

Skip the hot tub if you have a fever, are dehydrated or already feel affected by the heat. If symptoms of heat illness develop, leave the tub and seek appropriate medical help.

6. Take extra care with children and health conditions

Children heat up differently from adults and require close supervision. Pregnant people and anyone with heart, circulation, blood-pressure or other relevant health conditions should obtain individual advice from a healthcare professional before using a hot tub. Always follow the manufacturer’s safety guidance.

7. Keep the area around the tub safe

Water around the steps or decking can create a slip hazard. Keep access clear, use suitable non-slip surfaces and make sure the cover is handled and stored safely.

Summer hot tub maintenance

Hot weather can coincide with heavier hot tub use, more sun cream entering the water and faster changes in water quality. A simple maintenance routine helps keep the water inviting:

• Test and balance the water as often as the manufacturer recommends.
• Maintain the correct sanitiser level.
• Rinse and clean filters on schedule, or sooner after unusually heavy use.
• Shower before entering to reduce sweat, cosmetics and sun cream in the water.
• Keep the cover clean and use it when appropriate.
• Remove leaves and other debris promptly.
• Run the circulation and filtration system as directed, even when the heater is turned down.

Lowering the temperature does not replace proper sanitation. Hot tubs still need correctly balanced and treated water throughout summer.

Can you turn a hot tub into a cool tub?

Some hot tubs can be used at a much lower temperature during summer, creating an experience closer to a small plunge pool. However, most standard hot tubs actively heat water but do not chill it.

You can often help the water cool by lowering or switching off the heater through the approved controls, using economy mode where suitable and opening the cover for a limited period when the tub is not in use. Only do this when the hot tub can be supervised and protected from children, pets and debris. Replace and secure the cover afterwards.

Never switch off essential filtration or water-treatment functions simply to make the water cooler. Follow the manual for your specific model.

When should you avoid using a hot tub?

Do not use the hot tub if:

• The water is above 40°C.
• You feel ill, feverish, faint or dehydrated.
• The water is cloudy, smells unusual or has not been correctly sanitised.
• There is an electrical fault, damaged equipment or an unsafe surface nearby.
• You have been advised not to use one because of a medical condition or medication.
• Extreme weather makes the outdoor area unsafe.

If you are uncertain about water care, controls or whether a model is suitable for summer use, ask for product-specific guidance rather than guessing.

Choosing a hot tub for year-round use

If you are buying a hot tub, look beyond the number of seats. Consider the temperature-control range, insulation, filtration, cover quality, jet layout, electrical requirements and the space needed for safe access and servicing.

Explore Pro-Line Direct’s range of hot tubs to compare available sizes and features. If you need help understanding a specification or choosing a model for your garden, contact the Pro-Line Direct team.

Enjoy your hot tub throughout the summer

A hot tub does not have to sit unused when the temperature rises. Lowering the water temperature, soaking at cooler times, drinking plenty of water and paying attention to water care can make summer sessions safer and more enjoyable.

Listen to your body, follow the instructions for your specific hot tub and never exceed 40°C. With those basics in place, you can enjoy your garden spa in far more than just the colder months.

Frequently asked questions

Can you use a hot tub during a heatwave?

Yes, but lower the water temperature, avoid the hottest part of the day, keep the session short and stay hydrated. Do not use the tub if you already feel unwell or affected by the heat.

Should I turn my hot tub down in summer?

Many owners find a lower setting more comfortable and may also reduce the energy needed for heating. Change the setting in advance because a large volume of water can take time to cool.

Is 40°C too hot for a hot tub?

Forty degrees Celsius is the maximum, not a recommended target for every user or situation. A lower setting is usually more comfortable in summer. Never allow the water to exceed 40°C.

Can I put ice in my hot tub?

Only if the manufacturer explicitly says this is safe. Adding ice or a large amount of untreated water may disrupt water balance and could affect some systems. Lower the thermostat and follow the model’s approved cooling instructions instead.

Do hot tubs need chemicals in summer?

Yes. Hot tub water still needs the correct sanitiser level, pH balance, filtration and routine testing. Lower water temperature does not make untreated water safe.

Is it cheaper to run a hot tub at a lower temperature in summer?

A lower thermostat setting can reduce heating demand, but the actual saving depends on the weather, insulation, cover, electricity tariff and how the hot tub is used. Keep filtration and sanitation systems operating as instructed.