What do you wear to an ugly sweater party when it’s too hot for a sweater?
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Aloha, sun-kissed snowflake! It’s December, the invite says ugly sweater, and the thermometer says flip-flops. Good news: you don’t have to melt to join the fun. When it’s too hot for a sweater, wear the ugly sweater idea instead of the sweater itself: an ugly Christmas T-shirt, a tank top, a Christmas Hawaiian shirt or a knitted vest over a tee all count at most parties. Browse ugly Christmas T-shirts on Amazon, or use our warm-city temperatures and heat ladder below to pick the coolest option that still looks gloriously tacky.
Short answer: Wear a short-sleeve ugly Christmas T-shirt, a tank top or a Christmas Hawaiian shirt. They carry the same loud holiday designs without long sleeves or a thick knit. On December 18, NOAA’s normal high is 78°F in Miami and 82°F in Honolulu, so save fleece sweatshirts and acrylic knits for cool evenings.
What can you wear to an ugly sweater party when it’s too hot for a sweater?
At a warm-weather ugly sweater party you can wear anything with an ugly-sweater design that leaves your arms free: an ugly Christmas T-shirt, a Christmas tank top, a Christmas Hawaiian or button-down shirt, a T-shirt dress, or a sweater vest over a tee. The party is about the tacky holiday look, and every one of these carries it.
We sorted the options into a three-step heat ladder, grouped by how much of you each one covers and how thick it is. That grouping is our own, not a lab test. It follows {A(READY,”Ready.gov’s heat advice”)}: Wear loose, lightweight, light-colored clothing.
- Coolest (short or no sleeves, one thin layer): Christmas tank top, ugly Christmas T-shirt, Christmas Hawaiian or button-down shirt, Christmas T-shirt dress or tinsel shorts.
- In between (one knitted or long-sleeve piece): an ugly sweater vest over a tank or tee, or a long-sleeve ugly Christmas tee.
- Warmest (long sleeves and a thick layer): a knitted ugly sweater that’s mostly cotton, a fleece-lined ugly Christmas sweatshirt, or a knitted ugly sweater that’s mostly acrylic.
If the host is running a contest, ask whether tees and shirts can enter. Most of the contest pages we read for our ugly sweater contest categories guide judge the design, not the fabric, but a host’s rules come first.
How warm is December 18 in Miami, Phoenix, Houston and other warm cities?
On December 18, National Ugly Christmas Sweater Day (the 2026 date given by National Today), the normal high is 82°F in Honolulu, 78°F in Miami and Key West, and about 74°F in Tampa and Orlando. Phoenix, Houston, Los Angeles, San Diego and the big Texas cities sit near 63-66°F. Those are NOAA’s official 1991-2020 normals, the standard “average day” climate figures.
| City | Dec 18 normal high | Dec 18 normal low | December normal high |
|---|---|---|---|
| Honolulu, HI | 82°F | 69°F | 82°F |
| Miami, FL | 78°F | 64°F | 78°F |
| Key West, FL | 78°F | 68°F | 78°F |
| Tampa, FL | 74°F | 56°F | 74°F |
| Orlando, FL | 74°F | 53°F | 74°F |
| Jacksonville, FL | 67°F | 46°F | 68°F |
| Los Angeles, CA | 66°F | 49°F | 66°F |
| San Diego, CA | 66°F | 49°F | 66°F |
| Phoenix, AZ | 65°F | 44°F | 66°F |
| Houston, TX | 65°F | 45°F | 65°F |
| Tucson, AZ | 65°F | 40°F | 66°F |
| New Orleans, LA | 64°F | 48°F | 65°F |
| San Antonio, TX | 64°F | 42°F | 65°F |
| Austin, TX | 63°F | 43°F | 64°F |
| Dallas-Fort Worth, TX | 57°F | 38°F | 58°F |
| Las Vegas, NV | 56°F | 39°F | 57°F |
NOAA’s National Centers for Environmental Information (NCEI) publish these normals as 30-year averages, so any one December 18 can run warmer or cooler. For your own party, check the forecast a few days before. A crowded room also feels warmer than the outdoor number, and Ready.gov notes that Humidity increases the feeling of heat.
That’s a big deal in Miami, Houston and New Orleans.
Is an evening ugly sweater party cooler than the daytime high?
Yes, and in the desert it’s a lot cooler. NOAA’s normal low on December 18 is about 40°F in Tucson, 44°F in Phoenix and 39°F in Las Vegas, more than 20 degrees below the afternoon high. In Honolulu, Key West and Miami the low stays at 64-69°F. So a Phoenix backyard party after dark may suit a real sweater, while a Miami patio party usually won’t.
A simple rule from the table: for an outdoor evening party, look at the low. For an afternoon or indoor party, look at the high, then add the crowd.
What are ugly Christmas sweaters made of?
Most ugly Christmas sweaters are knitted from acrylic or an acrylic blend. Of the 99 sweater listings on UglyChristmasSweater.com that name a fabric, 89 contain acrylic, and 46 are mostly cotton. Tipsy Elves lists its ugly Christmas sweaters as 100% acrylic. If you want a real sweater in a warm city, look for one that’s mostly cotton.
| Fabric on the listing | Listings | Share of the 99 that name a fabric |
|---|---|---|
| Cotton and acrylic (55% or 60% cotton) | 37 | 37% |
| 100% acrylic | 27 | 27% |
| 85% acrylic, 15% wool | 25 | 25% |
| 60% cotton, 40% polyester | 4 | 4% |
| 100% cotton | 3 | 3% |
| 85% cotton, 15% wool | 2 | 2% |
| 100% polyester | 1 | 1% |
Other stores follow the same pattern. Tipsy Elves’ ugly Christmas sweaters carry a “100% ACRYLIC” material line and say handwash or dry clean only
. UglySweaters.com’s knitted sweaters and vests list 55% cotton and 45% polyester where they name a fabric. Since more than half the listings at UglyChristmasSweater.com don’t name a fabric at all, read the description or ask the store before you buy a sweater for a warm party.
Why does a fleece ugly Christmas sweatshirt feel warmer than a tee?
A fleece ugly Christmas sweatshirt feels warmer than a T-shirt because it adds a brushed, thicker layer and long sleeves. UglySweaters.com’s all-over-print sweatshirts, for example, describe soft fleece inside
. Even the store’s palm-tree flamingo design, Flamingle Bells, is a fleece sweatshirt, so a beachy design doesn’t mean a beach-weight shirt. Read what the garment is, not just what’s printed on it.
Which ugly sweater alternatives are coolest to wear?
The coolest ugly sweater alternatives are the ones with short or no sleeves and a single thin layer: a Christmas tank top, an ugly Christmas T-shirt, a Christmas Hawaiian shirt, or a Christmas T-shirt dress. Here’s our heat ladder with each store’s own fabric label next to the example.
| Group | What to wear | Example fabric from a store’s own listing |
|---|---|---|
| Coolest | Christmas tank top | Varies by seller: read the listing (Tipsy Elves had no Christmas tank tops on November 8, 2026) |
| Coolest | Ugly Christmas T-shirt | Tipsy Elves Christmas tee: 50% polyester, 50% cotton; UglySweaters.com prints on a Bella+Canvas tee |
| Coolest | Christmas Hawaiian or button-down shirt | Tipsy Elves: 97% rayon, 3% spandex, or 52% cotton, 48% rayon |
| Coolest | Christmas T-shirt dress or tinsel shorts | Tipsy Elves sequin T-shirt dress: 95% polyester, 5% spandex; tinsel fringe shorts: 100% polyester shell |
| In between | Ugly sweater vest over a tank or tee | UglySweaters.com knit vest: 55% cotton, 45% polyester |
| In between | Long-sleeve ugly Christmas tee | One thin layer that covers your arms |
| Warmest | Knitted ugly sweater, mostly cotton | UglyChristmasSweater.com: 55% or 60% cotton with acrylic |
| Warmest | Fleece-lined ugly Christmas sweatshirt | UglySweaters.com: “soft fleece inside”; Tipsy Elves Christmas sweatshirt: 50% cotton, 50% polyester |
| Warmest | Knitted ugly sweater, mostly acrylic | Tipsy Elves: 100% acrylic; UglyChristmasSweater.com: 85% acrylic, 15% wool |
We don’t rank the three warmest options against each other, because we haven’t found a reliable test that compares them. If you must wear a real sweater, pick the one whose label leans to cotton and wear a tank underneath, so you can take it off after the photos.
Does an ugly Christmas T-shirt count at an ugly sweater party?
An ugly Christmas T-shirt counts at most warm-weather ugly sweater parties, because it carries the same tacky knit-look design without the knit. UglySweaters.com’s T-shirt range prints its ugly-sweater artwork on a “soft Bella+Canvas tee: we counted 64 adult ugly Christmas tees there on November 8, 2026, all in XS to 5XL. A printed fair-isle pattern reads as
sweater” in photos, which is the whole point. For a contest, check the host’s rules first.
Is a Christmas Hawaiian shirt a good ugly sweater alternative?
A Christmas Hawaiian shirt is one of the best ugly sweater alternatives for Florida, Hawaii and Southern California: it has short sleeves, an open collar and a loud print, and Santa-on-a-surfboard designs are as tacky as any knit. Tipsy Elves’ Surfing Santa Tropical Hawaiian shirt and its Santa Palms button-down list 52% cotton and 48% rayon. We counted 8 Christmas Hawaiian and button-down shirts at Tipsy Elves, all in S to 4XL and all in stock on November 8, 2026. More on Amazon: Christmas Hawaiian shirts.
Where can you find ugly Christmas T-shirts in plus sizes?
UglySweaters.com sells its adult ugly Christmas T-shirts in XS to 5XL and its fleece sweatshirts in 2XS to 6XL, and Tipsy Elves’ Christmas Hawaiian and button-down shirts run S to 4XL. Women’s tees at Tipsy Elves go to 2X. On Amazon, search plus-size ugly Christmas T-shirts and read each listing’s own chart.
Honestly, we think Santa on a surfboard might be the most ugly-sweater design of all. Same tacky spirit, way more sunscreen.
A size label means something different at every store, so check the chest measurement on that store’s own chart before you order: Tipsy Elves’ size charts and UglyChristmasSweater.com’s size chart are good examples. Our guide to 4X, 5X and 6X ugly sweaters shows how one 50-inch chest lands on a different label at each store.
How do you make a lightweight ugly sweater yourself?
To make a lightweight ugly sweater yourself, start with a plain short-sleeve tee or tank and decorate it with things that don’t add bulk: iron-on patches, felt shapes, a bit of tinsel trim, pom-poms and safety pins. You get the homemade ugly-sweater look without the heat of a knit.
- Pick a red, green or white tee you don’t mind changing, or a plain red T-shirt. Lighter colors suit the sun, as Ready.gov’s advice suggests.
- Lay out the design flat first: a felt tree, a snowman, a “fair-isle” stripe of ribbon across the chest.
- Attach heavier pieces with safety pins and light ones with iron-on Christmas patches, so the tee is still wearable later.
- Keep decorations off the underarms and back, where they trap the most warmth when you sit or dance.
Short on time? The DIY section of our last-minute ugly sweater guide has a same-day fallback, and soft no-itch ideas for kids are in our ugly sweater day at school guide.
What should you wear to an ugly sweater 5K in warm weather?
For an ugly sweater 5K in warm weather, wear a running tee or tank with a Christmas print and pin a little tinsel or a felt shape on top, rather than a knit sweater. Many December races start in the morning, when NOAA’s normal low is the better guide: about 52-56°F in Orlando and Tampa, but 64°F in Miami. You’ll warm up within the first mile, so dress for the middle of the race, not the start line.
Check the race’s own page for its rules: many ugly sweater 5Ks hold a costume contest, and some ask runners to avoid anything that could trip others. Search ugly Christmas running shirts for tees made for the job.
How do you keep guests cool at a warm-weather ugly sweater party?
To keep guests cool at a warm-weather ugly sweater party, tell them in the invitation that tees, tanks and Hawaiian shirts count, then set up the room for heat: air conditioning or shade, cold drinks and water, and a spot to hang a sweater after the group photo. Ready.gov also says to Drink plenty of fluids to stay hydrated.
- Say it on the invite:
Ugly sweaters, ugly tees, ugly Hawaiian shirts: all welcome.
Our ugly sweater party checklist has invitation wording to adapt. - Take the group photo early, while everyone’s still fresh, so sweater-wearers can strip down to a tee afterward.
- Keep a water station next to the cocktails, and plenty of ice.
- Give the contest a warm-weather award, such as “Best tropical twist”, so tees and Hawaiian shirts have something to win.
- Remember the bump: guests who are pregnant may run warm, and our maternity ugly sweater guide covers open cardigans and vests.
Off you go, sun-kissed snowflake: pick your rung on the heat ladder, grab a cold drink, and be the coolest ugly dresser at the party, in both senses.
Sources and further reading
- NOAA NCEI: U.S. Climate Normals 1991-2020 — daily (Dec 18) and monthly (December) normal highs and lows for 16 stations, read through NCEI’s data service
- Ready.gov: Extreme Heat — loose, lightweight, light-colored clothing; humidity; fluids
- UglySweaters.com: T-shirts — 64 adult ugly Christmas tees, XS-5XL, on Bella+Canvas tees
- UglySweaters.com: Vests — 10 knitted Christmas vests, 55% cotton / 45% polyester
- UglySweaters.com: Flamingle Bells sweatshirt — soft fleece inside; 2XS-6XL
- Tipsy Elves: Surfing Santa Tropical Hawaiian Christmas Shirt — 52% cotton / 48% rayon
- Tipsy Elves: Santa Palms Button Down Shirt — 52% cotton / 48% rayon
- Tipsy Elves: Snowball Fight Game Ugly Christmas Sweater — 100% acrylic; handwash or dry clean only
- Tipsy Elves: Size charts — check chest before ordering
- UglyChristmasSweater.com: Size chart — check chest before ordering
- Bella+Canvas — the tee brand UglySweaters.com prints on
- National Today: National Ugly Christmas Sweater Day — December 18, 2026
- National Capital Poison Center: Swallowed a button battery? — severe damage in just 2 hours; 800-498-8666
Questions and answers
What can I wear to an ugly sweater party if it’s hot?
Wear an ugly Christmas T-shirt, a Christmas tank top, a Christmas Hawaiian shirt or a sweater vest over a tee. They carry the same tacky holiday designs with short or no sleeves. Ready.gov’s heat advice is to wear loose, lightweight, light-colored clothing.
Can you wear an ugly Christmas t-shirt instead of a sweater?
At most parties, yes: the point is the tacky holiday design, and ugly Christmas tees print the same knit-look patterns. UglySweaters.com, for example, sells 64 adult ugly Christmas tees in XS to 5XL. If there’s a contest, check the host’s rules first.
How hot is it on National Ugly Sweater Day in Florida?
NOAA’s 1991-2020 normal high on December 18 is about 78°F in Miami and Key West, 74°F in Tampa and Orlando and 67°F in Jacksonville. Normal lows run from about 46°F in Jacksonville to 68°F in Key West.
What are ugly Christmas sweaters made of?
Mostly acrylic or acrylic blends. Of the 99 UglyChristmasSweater.com sweater listings that name a fabric, 89 contain acrylic and 46 are mostly cotton; Tipsy Elves lists its ugly sweaters as 100% acrylic. Pick a mostly-cotton one for a warm party.
What do you wear to an ugly sweater run?
A running tee or tank with a Christmas print, with a little tinsel or felt pinned on, is cooler than a knit sweater. Dress for the middle of the race, not the cold start line, and check the race’s own page for its costume rules.