Rising UV & Humidity: Preparing Sensitive Skin for the Australian Summer Ahead

Written by Dennis Guevarra, Pharmacist

By late October, the after-school routine starts to change. Kids come home from sport flushed and damp, the car is hot by mid-afternoon, and the thick cream that got your family through a windy September suddenly feels heavy on the skin.

Two things shift at once as spring runs into summer. UV levels climb, and the air turns warmer and stickier. Sensitive and eczema-prone skin notices both, often before you do. A few small changes now can make the coming months more comfortable for everyone.

Why does sensitive skin react more as the weather warms up?

Heat and humidity change how skin behaves within a single afternoon: it sweats more, makes more oil and loses more water. For eczema-prone skin, trapped sweat is also thought to add to itching.

In a small study of summer heat exposure, people who spent 90 minutes outdoors produced more sweat and oil, measured greasier, and lost more water through the skin’s surface, a process called transepidermal water loss (TEWL).

Cooler months bring their own strain. A review of humidity and temperature research found that cold, dry conditions weaken the skin barrier and raise the risk of flares in people with atopic dermatitis (eczema). Late spring swaps that dryness for heat and sweat, so your family’s routine needs to shift with it.

Sweat has two sides. Researchers describe it as part of how skin stays moist and defends itself. In eczema, though, sweat can get trapped or leak into surrounding skin, and that is thought to promote itching. Humid days make this harder to manage, because sweat evaporates more slowly.

The Australasian Society of Clinical Immunology and Allergy (ASCIA) also lists overheating among common eczema triggers, alongside soap, perfumes and prickly fabrics.

If you’ve read our guide to Spring Skin Allergies: How Environmental Changes Affect Sensitive Skin, you’ll know pollen plays a part too. Heat and sweat add another layer as the weeks warm up.

Do you still need sun protection on mild spring days?

Yes. Temperature doesn’t affect UV, so Cancer Council Australia recommends sun protection whenever the UV Index reaches 3 or above, even on cool or overcast days.

Cancer Council Australia warns that just 15 minutes of unprotected exposure at those levels is enough to start damaging skin. A mild 22°C morning in October can still call for full sun protection. The free SunSmart app and the Bureau of Meteorology website show daily UV forecasts for your area.

For babies under 12 months, Cancer Council NSW advises keeping them out of direct sun altogether once UV reaches 3.

The five SunSmart steps still apply to sensitive skin:

Slip on covering clothing
Slop on SPF 50 or SPF 50+, broad-spectrum, water-resistant sunscreen
Slap on a hat
Seek shade
Slide on some sunglasses

If your skin reacts easily, patch test a new sunscreen on a small area for about a week before using it all over.

How should your family’s skincare routine change for summer?

Move to a lighter daytime moisturiser, keep moisturising twice a day, rinse off sweat and salt water, and dress for airflow. These summer skincare tips suit sensitive and eczema-prone skin from late spring onwards:

Switch to a lighter moisturiser for daytime. A lotion absorbs faster on warm days, while a richer cream can stay for dry patches at night.
Keep moisturising twice a day. That advice from ASCIA doesn’t pause for summer.
Rinse off sweat after sport or play. Use lukewarm water, pat skin dry, and moisturise while it’s still slightly damp. Skip soap, which ASCIA lists as an irritant.
Dress for airflow. DermNet advises avoiding tight or excessive clothing and choosing breathable cotton, especially for babies, whose sweat ducts are still developing.
After a swim, rinse and reapply. Rinse off salt water or pool water, moisturise, and reapply sunscreen, which Cancer Council advises every two hours or after swimming or heavy sweating.
Keep bedrooms cool and ventilated. Overheating is a common eczema trigger, day or night.
Check the UV before heading out, even when the day feels mild.

What’s the difference between prepping skin and treating a flare?

Prepping is what you do while skin is calm. A flare calls for treatment creams or ointments, because a moisturiser on its own isn’t a flare treatment.

Prepping covers daily moisturiser, sun protection, breathable clothes and rinsing off sweat. These habits work best when started before the hottest weeks arrive. It’s a bit like checking the tyres before a long road trip.

A flare is the flat tyre. Red, itchy, weeping or cracked patches call for treatment creams or ointments, applied as soon as the flare starts, according to ASCIA. For severe eczema, doctors may prescribe other treatments. A gentle moisturiser supports comfort between flares.

See your GP or pharmacist if:

Eczema doesn’t improve within a week, or your child has a fever (ASCIA)
A heat rash has pus-filled blisters, lasts more than three days, or your child seems unwell (Raising Children Network)
Skin shows signs of infection, such as spreading warmth, swelling or pus

Where does Natralus fit in?

For warm days, Natralus SuperFood Body Lotion offers a lighter option. It’s built on aloe vera with shea butter, jojoba and paw paw seed oil, absorbs quickly, and is fragrance free. It also works as an after-sun moisturiser once you’re back indoors.

For drier patches or cooler evenings, SorboDerm Natural Restoring Gentle Moisturiser is a non-greasy, un-fragranced, plant-based cream with rice bran oil, glycerin and vitamin E. As with any new product, patch test first, particularly for babies and young children.

Quick answers for summer skin

Can a moisturiser replace sunscreen? No. Natralus moisturisers help keep skin soft and comfortable, but they don’t provide sun protection. Use them alongside the SunSmart steps on any day the UV reaches 3.

Can thick creams cause heat rash? They can contribute. The Raising Children Network lists greasy ointments among the causes of heat rash, which happens when sweat glands get blocked.

How often should eczema-prone skin be moisturised in summer? At least twice a day for the face and body, according to ASCIA, and summer is no exception.

Start the lighter routine this week, while your family’s skin is still calm.

Medical disclaimer: For educational purposes only. Consult your pharmacist/healthcare provider.