Dehydrated skin doesn't need richer creams (nobody wants a heavy moisturiser in 30-degree heat); it needs water, layered cleverly and sealed in lightly. Think watery essences, humectant-heavy serums, gel textures that sink in before you've reached for your SPF, and mists you can spritz over makeup at your desk for that boost of hydration. Consider this a cool glass of iced water for your skin, with 15 juicy buys to keep your complexion plump, bouncy and genuinely dewy until the weather breaks.
LANEIGE
Cream Skin Cerapeptide Toner & Moisturiser, £29.50
A toner and moisturiser in one milky, fast-sinking step — ideal for mornings when a full routine feels like too much admin in the heat.
Beauty of Joseon
Glow Replenishing Rice Milk Toner, £15.50
This K-beauty favourite floods skin with rice bran water and probiotics for an instant milky-glow effect that layers beautifully under serum.
Anua Rice
70+ Glow Milky Toner, £22
Made with 70% rice extract, this generous 250ml bottle delivers glassy, lit-from-within hydration. Pat it in with hands rather than wasting it on cotton pads.
Thank You Farmer
Rice Pure Milky Hydrating Essential Toner, £20
A gentle, nourishing essence-toner hybrid that softens heat-stressed skin without a whisper of stickiness.
COSRX
Advanced Snail 96 Mucin Power Essence, £24.99
The cult classic for a reason: 96% snail mucin drenches skin in bouncy, reparative hydration that makes everything applied afterwards work harder.
Medik8
Hydr8 B5 Serum, £45
Three molecular weights of hyaluronic acid plus vitamin B5 mean hydration at every level of the skin. The serum to reach for when your face feels tight by 3pm.
The Ordinary
Hyaluronic Acid 2% + B5, £9.60
Proof that serious hydration needn't cost serious money. Apply to damp skin and seal with moisturiser to give the hyaluronic acid water to hold onto.
Glow Recipe
Watermelon Glow Ultra-Fine Mist, £26
The finest of fine mists, laced with watermelon and hyaluronic acid – spritz over makeup for an instant refresh that won't disturb your base.
BYOMA
Hydrating Serum, £13.99
A barrier-boosting blend of tri-ceramides, squalane and glycerin that's clinically proven to hydrate for up to 24 hours. Press into damp skin and double the drops if you're feeling particularly parched.
By Terry
Matcha Mist, £30
A dual-layer elixir that shakes together 30% milky moisture with a 70% matcha-infused essence. Simply spritz over makeup for an instant glow, or chill it in the fridge and use it as a morning de-puffer.
Caudalie
Grape Water, £19
One ingredient, endlessly useful: organic grape water soothes, cools and calms heat-flushed skin — stash it in the fridge for maximum relief.
Avène
Hydrance Aqua-Gel Moisturiser for Dehydrated Skin, £25.25
An ultra-light water gel built on Avène's famous Thermal Spring Water and hyaluronic acid, clinically shown to boost hydration by 108%, and gentle enough for even the most sensitive, heat-frazzled skin.
La Roche Posay
Hyalu B5 Instant Fresh Cooling Water Breaking Gel Combining Hyaluronic Acid, Vitamin B5 and BHA, £38
A clever cooling gel that breaks into water on contact with skin, pairing hyaluronic acid and vitamin B5 with a whisper of salicylic acid to hydrate, refine pores and leave a smooth, natural-matte finish that doubles as a primer.
Medik8
H.E.O. Mask, £60
The Hydr8 Emergency Overhaul does exactly what the name promises, an intensive overnight drink for skin that's been thoroughly wrung out by the sun.
111SKIN
Rose Gold Brightening Facial Treatment Mask, £107
The beauty editor's pre-event sheet mask of choice, twenty minutes under this rose-damascena-soaked cellulose and skin looks plumped, calmed and quietly luxe.
Frequently Asked Questions
What's the difference between dry and dehydrated skin?
Dry skin is a skin type that lacks oil, while dehydrated skin is a temporary condition that lacks water — and any skin type, including oily, can become dehydrated. Dehydrated skin typically feels tight, looks dull and shows exaggerated fine lines, and it's especially common during hot weather when sun exposure, air conditioning and increased sweating deplete the skin's water levels. Dry skin needs richer, oil-based products, whereas dehydrated skin responds best to water-based humectants like hyaluronic acid and glycerin.
Should I switch to a gel moisturiser in summer?
For most skin types, yes. Gel and gel-cream moisturisers deliver water-based hydration without the heavier occlusive oils found in winter creams, so they sink in quickly, feel cooling on the skin and sit better under SPF and makeup in the heat. Very dry skin types may still prefer a light cream, but oily, combination and normal skin will generally find a gel formula more comfortable during a heatwave.
How do you layer hydrating skincare correctly?
Apply products from thinnest to thickest: essence or hydrating toner first on damp skin, followed by a hyaluronic acid or humectant serum, then a gel moisturiser to seal everything in, and always SPF as your final morning step. Applying hyaluronic acid to slightly damp skin is key — it needs water to draw into the skin, and applying it to bone-dry skin in a dry environment can have the opposite effect.
Can you use a hydrating mist over makeup?
Yes — an ultra-fine hydrating mist is one of the easiest ways to refresh skin during a heatwave without disturbing your base. Hold the bottle around 20 centimetres from the face and mist lightly rather than saturating the skin. Look for formulas containing hyaluronic acid, glycerin or soothing botanical waters, and avoid anything with a high alcohol content, which can be drying.
How often should you use a hydrating sheet mask?
Two to three times a week is ideal during hot weather, though gentle, hydration-focused sheet masks are typically mild enough for daily use if skin is feeling particularly parched. For an extra cooling effect, store sheet masks in the fridge before use — the cold helps calm heat-flushed skin and reduce puffiness.
Does drinking more water hydrate your skin?
Staying hydrated supports overall skin health, but drinking water alone won't fix dehydrated skin — water reaches the skin last, after your vital organs. Topical hydration is far more effective at plumping the skin's surface, which is why layering humectant-rich skincare and sealing it in with a moisturiser makes a visible difference that an extra glass of water won't.
