How to Tell If Your Skin Needs Hydration: Tips and Lightweight Serums

Emma Caldwell
August 4, 2026

Lauren Izquierdo

Until not long ago it was common to think that dehydrated skin was the result of dry skin. However, as the years have passed, we have all learned that any skin type may need an extra boost of hydration, especially when temperatures exceed 35 degrees. In fact, one of the biggest surprises in the beauty world is discovering that shiny skin, with small breakouts or even with an oily tendency can also be asking for help. And yes, it often sends us signals, even if we haven’t learned to identify them.

«The sensation of tightness is one of the most common signs, but not the only one,» explains Izaskun Franco, skincare expert and SPA Manager of Zafiro Palace Andratx. «It is also common to notice the skin looking duller, with small flakes or even more reactive than normal». The expert insists that many people make the same mistake of thinking that, if their T-zone is shiny, they do not need to hydrate. «Combination or oily skin still needs hydration. The difference lies in choosing products with an appropriate water-to-oil ratio for their needs,» she adds.

That is why learning to listen to our skin is extremely important during the summer months, since factors such as the sun, air conditioning, chlorine and greater exposure to the outdoors cause it to lose water more easily and require formulas capable of replenishing it without feeling heavy. This is where lightweight serums come into play. Thanks to their comfortable textures, quick absorption and ability to deliver an extra hydration boost, they will keep your face supple and with an irresistible juicy look.

The lightweight serums I recommend using in summer


Vichy Minéral 89.

Vichy Minéral 89. Its formula combines hyaluronic acid with mineralizing volcanic water, yielding a very lightweight product that absorbs in seconds and works well when it’s hot. If your skin feels tight after cleansing or you notice it losing radiance throughout the day, this is one of the first you would try.


La Roche-Posay Hyalu B5 Sérum.

La Roche-Posay Hyalu B5 Sérum. It’s a classic, and that’s why it sells out wherever it goes. If, in addition to dehydration, you notice a lack of elasticity or a somewhat tired look, this is the one for you. It combines hyaluronic acid of different molecular weights with vitamin B5, a compound known for its repairing and soothing properties.

Moreover, although its texture is slightly richer than other options on the list, it remains comfortable for summer. Honestly, it’s one of the serums I always have on my vanity. I also use it as a primer, so that my skin doesn’t dry out during summer.


The Ordinary Marine Hyaluronics.

The Ordinary Marine Hyaluronics. Unlike the classic hyaluronic acid serums, this one has a watery consistency that vanishes immediately on the skin. Its formula includes marine actives capable of attracting and retaining water, so it achieves surprising hydration without adding weight. It is especially recommended for combination and oily skin.


SkinCeuticals Hydrating B5 Gel.

SkinCeuticals Hydrating B5 Gel. It is one of the experts’ favorites. It combines hyaluronic acid and vitamin B5 in an elegant formula that provides immediate hydration and improves the overall quality of your skin with continued use. Moreover, it is suitable for all skin types and absorbs in seconds.


Isdin Hyaluronic Concentrate.

Isdin Hyaluronic Concentrate. What people like is that it hydrates deeply without feeling heavy. Additionally, its formula includes antioxidants and helps improve the appearance of early expression lines. My mother uses it, and she always says that its texture is incredibly pleasant and leaves the skin feeling fresh and rested.

Emma Caldwell
Emma Caldwell
I’m Clara Desrosiers, a writer and fashion editor based in Toronto. I founded Backdoor Toronto to explore the intersection of fashion, identity, and culture through honest storytelling. My work is driven by curiosity, community, and a love for the creative pulse that defines this city.