Why Is My Hair So Frizzy? The Real Causes Explained

TL;DR:

• Frizz is almost always caused by one of five things: dryness, humidity, damage, hair type, or how you wash and dry
• South Africa's coastal humidity is a major frizz trigger that products alone can't fully overcome
• Sudden frizz usually has a recent trigger — new colour, more heat, harder water, or seasonal humidity
• Dry hair and frizzy hair overlap — treating the dryness is the first step either way
• Once you know your cause, the fix is clear

If you've been fighting frizz for years without fully winning, there's a reason — you're probably treating the symptom rather than the cause. Here's what's actually behind frizzy hair, and what that means for how to fix yours.

Meet the experts:
Royston and Warren at Cavendish Square — Judy, head trainer — Lewis, owner — Jackie at Gardens Centre — Debbie and Nikí at V&A Waterfront — Danny and Charlene at Canal Walk — Lynette, Samantha and Dominique at Constantia Village

01 — What Frizz Actually Is

Every strand of hair has an outer protective layer called the cuticle — overlapping scales that lie flat when the hair is healthy. When those scales lift, hair looks rough, loses shine, and absorbs moisture from the air around it, swelling into frizz. The cuticle lifts when hair is dry, damaged, or structurally prone to it.

"Frizz isn't a hair type," says Lewis. "It's a signal. It's the hair telling you that the cuticle is raised and moisture isn't balanced. Treat what's raising the cuticle and the frizz follows."

02 — The Five Most Common Causes

Dryness — the number one cause. Dry hair is thirsty. It pulls moisture from humid air, which causes the shaft to swell and lift out of place. Hydration, not anti-frizz products, is the real foundation of frizz control.

Humidity — especially in Cape Town and South Africa's coastal cities. High atmospheric moisture means even well-conditioned hair can frizz in certain weather. "A perfect blow-dry on a humid Cape Town morning doesn't always make it past Sea Point," says Charlene at Canal Walk. "The humidity here is significant and it requires products specifically formulated to seal against it."

Damage — colour, bleach, heat styling and chemical services lift and erode the cuticle. Damaged, porous hair can't hold moisture evenly, so it frizzes more easily and more dramatically.

Natural hair type — curly, wavy and coarse hair is naturally more frizz-prone. The cuticle sits more openly, and scalp oils struggle to travel the full length of the strand. This isn't damage — it's structure. It's managed, not cured.

How you wash and dry — over-washing, very hot water, harsh sulphate shampoos and rough towel-drying all rough up the cuticle and strip protective oils, leaving hair drier and frizzier over time.

03 — Why Did My Hair Suddenly Get Frizzy?

A sudden change in frizz usually has a recent trigger. Common ones: a new colour or bleach service that increased porosity — more frequent heat styling without protection — a shift into South Africa's humid season — moving to an area with harder water — or damage that has built up gradually and reached a tipping point.

"Identifying the trigger tells you what to do," says Royston at Cavendish. "If it started after bleaching, the fix is repair and porosity care. If it started with the weather changing, the fix is humidity-sealing products. Same symptom, different solution."

04 — Is Your Hair Frizzy or Just Dry?

They overlap. Dryness is one of the main causes of frizz, and many clients have both. The distinction: dry hair feels rough and brittle even indoors. Frizz flares specifically with humidity or friction. Hair can be well-conditioned and still frizz if it's damaged or naturally coarse.

"Either way, hydration is always the first move," says Judy, head trainer. "Whether the frizz is from dryness, damage or texture — start with moisture. It addresses the underlying cause regardless of which one is driving it."

05 — The Fix Follows the Cause

• Dryness-driven frizz: sulphate-free shampoo, weekly mask, leave-in conditioner, finishing oil
• Humidity-driven frizz: leave-in anti-frizz primer on damp hair + humidity-sealing finishing product (Kérastase Gloss Absolu is specifically formulated for this)
• Damage-driven frizz: repair treatment (K18, Redken Acidic Bonding Concentrate) + moisture routine
• Texture-driven frizz: curl-specific products applied wet, microfibre towel, avoid brushing dry
• Wash/dry habits: switch to sulphate-free shampoo, reduce washing frequency, microfibre towel, cool rinse

06 — When to See a Stylist

If frizz is persistent, severe, or came with a change in the hair's feel or strength, a stylist can assess whether it's a product and routine issue — or whether damage, porosity or hair condition needs professional attention.

"We do frizz consultations before every smoothing treatment," says Debbie at the Waterfront. "Understanding the cause changes the treatment entirely. Two clients with the same frizz might need completely different solutions. That's why we start with a conversation, not a product recommendation."

Frequently Asked Questions

What does frizzy hair mean?

Hair whose cuticle is raised rather than lying flat — so individual strands lift away, absorb moisture from the air, and look rough or puffy. It usually signals dryness, damage, or a naturally textured hair type.

Why is my hair frizzy even after straightening?

Heat without protection damages the cuticle, and humidity re-swells the hair shaft when you step outside. A heat protectant plus a humidity-sealing finishing product helps the smoothness last longer.

Is frizz genetic?

Partly. Curly and coarse hair types are naturally more frizz-prone due to hair structure. But dryness, damage and humidity all contribute to frizz regardless of genetics.

Does cutting hair help with frizz?

It can — trimming damaged, split ends removes the most frizz-prone sections. It won't change frizz caused by dryness or humidity, but healthier ends respond better to products and hold smoother for longer.

Why is my hair frizzy in Cape Town specifically?

Coastal humidity. Cape Town's Atlantic Ocean proximity means consistently high atmospheric moisture, especially in summer and after rain. Products designed to seal the cuticle against humidity — like Kérastase Gloss Absolu — are particularly useful here.

Shop professional frizz care at Partners Hair, or find your nearest salon for a frizz consultation. Free delivery on orders over R390.