How to Protect Hair from Sun & Humidity: 10 Pro Tips

• Sunlight can dry out strands and fade colour faster
• Humidity causes hair to swell, leading to frizz and loss of shape
• Using targeted products can help minimise both sun damage and humidity impact
• Styling techniques and protective care go a long way in keeping hair healthy

When temperatures rise, we protect our skin – but what about our hair? Just like UV rays can harm our skin, they can also damage our hair, fade colour, and cause dryness. And as for humidity? It’s a fast track to frizz and loss of hair definition.

If you’re wondering how to protect hair from sun damage and keep humidity at bay, this guide is for you. From UV defence to anti-frizz hacks, here’s everything you need to know to help keep your hair looking healthy, shiny, and under control all year long – even in summer.

Here, we’ll cover:

• How the sun can damage hair
• How to prevent frizzy hair when it’s humid
• 10 pro tips to protect your hair from the sun and humidity

We often associate sun damage with our skin – but your hair is just as vulnerable. According to a 2025 study by the Wimpole Clinic, overexposure to UV rays causes oxidation in the hair fibres, damaging hair by breaking down essential proteins like keratin. The result? Weak, brittle strands that lose shine and elasticity.

If you colour your hair, you’ll notice the effects even faster. UV exposure strips pigment and alters tone, especially in blonde, red and pastel-coloured shades. Think dull, faded colour and a rougher texture – not ideal.

Humidity refers to the amount of moisture in the air. The higher the moisture, the frizzier hair can get. This is especially true for dry, brittle, or damaged hair, which ends up absorbing that moisture like a sponge.

Humidity and hair are not BFFs – ever spent ages straightening your hair only to have it puff up the second you leave the house? That’s humidity at work. Excess moisture causes the hair cuticle to lift, leading to frizz, puffiness, and loss of definition. While all hair types can react to humidity, curly, wavy and porous hair are usually the most affected.

How to protect hair from humidity? Luckily, with the right routine and products, you can help keep your locks smooth and manageable. Follow our tips below to keep your hair looking silky smooth, no matter the weather.

1. Use products with UV filters

Look for haircare that contains UV filters to shield strands from sun exposure. The Vitamino Color Spectrum Glass Shine Serum from L'Oréal Professionnel is a stylist-approved choice that protects hair against UV damage* while locking in colour vibrancy and adding wow-worthy shine. It also has anti-frizz and anti-humidity benefits (for up to 80% humidity in the air*), so it’s the ultimate product for protecting hair in sunny, humid weather.

2. Keep hair well hydrated

Sun and humidity both strip hydration. Quench thirsty and damaged strands with the Absolut Repair Molecular range, enriched with peptide technology to strengthen and hydrate hair from within.

3. Layer in leave-in protection

Just like you'd apply sunscreen before stepping outside, remember to use a leave-in serum to protect your hair from the sun. Our pro tip? Opt for formulations that offer both heat and frizz protection, like our Vitamino Color Spectrum Glass Shine Serum and SteamPod Smoothing Treatment. 

4. Accessorise smartly

Think: wide-brimmed hats, silk scarfs, or UV-resistant caps. These items aren’t just stylish – they help protect your tresses from sun exposure, which is especially important during peak UV hours from 11am to 3pm.

5. Cut back on heat styling

Already exposing your hair to the sun’s heat? Don’t give your hair additional stress. Embrace air-drying or use a diffuser on a cool setting to maintain structure.

Can’t skip the straighteners? Opt for a less-damaging option like the Steampod 4, which styles hair with up to 80% less damage**, and always apply heat protection.

6. Keep it cool with lukewarm water

Switch from hot to cooler showers. Hot water opens the hair cuticle and speeds up colour fading, so opt for lukewarm water and a sulphate-free cleanser like the Vitamino Color Spectrum range to maintain hydration and colour brilliance.

7. Skip the brush on dry curls

Got curly or wavy hair? Avoid brushing it when dry, as this can disrupt curl patterns and lead to frizz. Instead, use a wide-tooth comb on damp hair.

8. Go for protective hairstyles

Get creative! Buns, plaits, and twists all help reduce exposure to UV and keep hair under control in humid weather. Plus, these styles limit friction and tangling – perfect for those beach or pool days.

9. Add a weekly treatment mask

Refresh sun-exposed hair with a deep conditioning mask. Try pairing your shampoo with a nourishing mask to seal in moisture and smooth strands.

10. Rinse and reset after sun exposure

After a sun-filled day, don’t forget to rinse your hair to remove salt, sweat, chlorine, and product buildup. Follow up with a replenishing conditioner and serum to repair damage and reset your strands.

Whether you’re holidaying poolside, or navigating a British heatwave, with the right haircare products, you can protect your hair from humidity and sun damage.

The right hair care can make all the difference in keeping frizz, puffiness, breakage, and loss of colour vibrancy at bay — whatever the weather.

So, reach out for professional-grade products and make small tweaks to your hair routine for shiny and healthy-looking locks all year long.