These Lightweight Dresses Will Keep You Comfortable Amid Summer Heatwaves—and They’re All Under $40

Lightweight sundresses are the unofficial uniform of summer, and right now Amazon has dozens of breathable options under $40 to shop. With flowy and airy fits, versatile styles, and lengths perfect for layering, now’s the time to stock up on seasonal staples that’ll make the heat wave more bearable (and fashionable!).

We scoured Amazon’s sale for dresses that are cute enough for brunch and comfy enough for the beach, landing on cool and casual designs that won’t break the bank. From a trendy denim overall dress ($37) to a ruffle-sleeved frock ($17), here are 12 fits worth adding to your closet.

Best Lightweight Dresses Under $40 at Amazon

Ofeefan Ruffle Short-Sleeve V-Neck Shift Dress, $17 (was $37)
Grecerelle Round Neck Maxi Vacation Dress, $29
Bzb Denim Crewneck Jean Denim Overall Dress, $37 (was $46)
Athlisan Casual V-Neck Sundress, $28 (was $34)
Anrabess Sleeveless Smocked Back Tank Midi Dress, $39
Yiulangde Smocked Halter Maxi Dress, $37
Kirundo Flowy A-Line Vacation Dress, $26 (was $36)
Zaberry Floral Sundress, $38 (was $43)
ChicGal Strapless Floral Sundress, $15 (was $19)
Floerns Plus Size Eyelet Embroidery Flared Cami Dress, $37

Ofeefan Ruffle Short Sleeve V-Neck Shift Dress

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Amazon

This versatile shift dress seamlessly transitions from farmers markets to date nights with its relaxed fit, stretchy material, and subtly sweet ruffle sleeves. Pair it with sneakers for errands around town and jazz it up with kitten heels for an evening out. The dress even has thoughtful front pockets for stashing goods on the go.

Shoppers appreciate the frock’s flattering drape, true-to-size feel, and lightweight softness. According to one five-star reviewer, who called the dress “fashion-forward and comfortable,” the style is “perfect for summer outings, trips to the grocery store, or dinner under the stars.” Try it on for yourself for under $20 today in over 20 different colorways.

Grecerelle Round Neck Maxi Vacation Dress

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Amazon

If you’re headed somewhere hot this summer, this functional dress can help keep you cool and protected from the sun. Its maxi length, shoulder-covering cap sleeves, and high-neck design work to block UV rays while breathable fabrics keep air circulating. The dress features handy pockets, a modest side slit hem, and an underarm “anti-flash” patch to avoid exposure. Plus, it's great for travelers, thanks to its wrinkle-resistant and machine-washable materials (one frequent flyer called the maxi “so comfy” for long plane rides and their “go-to-travel dress”).

Customers praise the Grecerelle Vacation Dress for its size offerings that range from XS to 3XL, as well as its 40+ color options that include both muted neutrals and bold patterns. With over 1,300 five-star reviews, there’s plenty to love about this holiday staple. Grab it now in your favorite shade for $29.

Bzb Denim Crewneck Jean Denim Overall Dress

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Amazon

Enjoy classic comfort with this deceptively soft denim dress. Constructed from 85% cotton and 15% polyester, it has the perfect balance of stretch and structure for hot days and layering. Pair the mini dress with a white tee and tennis shoes for the perfect summer fit, or transition it during the fall with a long-sleeve undershirt and boots.