What to Wear Today

Quick answer: dress for how cold it feels. From 85°F up, one loose, light piece; 75–84°F, a breathable top or dress; 65–74°F, one layer and a light one to carry; 55–64°F, a long-sleeve top and a light jacket; 45–54°F, three layers; 35–44°F, a warm base, a wool sweater and a real coat; below that, thermals, a heavy coat, a hat, a scarf and gloves.

How to use it

Type today’s temperature from your weather app (tap °C if you think in Celsius, or just type “15 c”), and the wind speed if it is windy. Tap the sky: sunny, cloudy, rain or snow. The answer is the outfit piece by piece, from the top to the shoes and what to carry, with how cold it feels once the wind is counted and how warm that outfit is. Under it are the words of the guides each band comes from, and Needle Style’s outfit posts for that weather.

What to wear, degree by degree

Each band’s outfit is what at least two per-temperature guides say. Where one band ends and the next begins is ours: each is centred on the round numbers people search for (60, 50, 40 degrees).

• 90s: “lightweight fabrics, loose silhouettes, and as little unnecessary layering as possible” (Who What Wear); “Wear lightweight, loose fitting, light-colored clothing to reflect heat and sunlight” (the National Weather Service).
• 80s: “Breathable top or dress + airy bottom if needed + open or lightweight shoes + one optional AC layer” (Klodsy).
• 70s: “At 70°F (21°C) most people are comfortable in a single layer”, and “At 60 degrees you wear the jacket. At 70 you carry it” (Klodsy).
• 60s: “A denim jacket, light blazer, shacket, or thin bomber covers almost every situation” (Klodsy); “A light jacket is a must-have for mild weather that isn’t decidedly hot or cold” (Nike).
• 50s: “a structured 3-layer system” (Klodsy), but “a heavy puffer jacket or parka would be overkill on a 50-degree day” (Nike).
• 40s: “A structured 3-layer system is non-negotiable at 40 degrees” (Klodsy); “A puffer jacket? Definitely” and “The turtleneck is a go-to cold-weather remedy” (Who What Wear).
• 30s and below: “puffer coats, snow boots, leather gloves, or chunky knits”, with “thermal underpinnings” under “a heavy wool coat” (Who What Wear). The CDC: a scarf or knit mask over your face and mouth, a hat, mittens or gloves, a water-resistant coat and boots, “and several layers of loose-fitting clothing.”

Wind: how cold it really feels

The calculator uses the National Weather Service’s own wind chill formula: 35.74 + 0.6215T − 35.75(V^0.16) + 0.4275T(V^0.16), with T the air temperature in °F and V the wind in mph. The NWS defines it “only for temperatures at or below 50°F and wind speeds above 3 mph”, so above 50°F the wind changes nothing here. It matters: 40°F with a 15 mph wind feels like 32°F, which is a whole band colder. At the far end, “If the temperature is 0°F and the wind is blowing at 15 mph, the wind chill is -19°F. At this wind chill temperature, exposed skin can freeze in 30 minutes” (NWS). On a windy day, make the outer layer one that stops the wind: in REI’s words, the “Outer layer (shell layer): shields you from wind and rain”.

Three layers, and what each one does

REI’s layering guide: the “Base layer (underwear layer): wicks sweat off your skin”, the “Middle layer (insulating layer): retains body heat to protect you from the cold”, and the outer layer shields you from wind and rain. Cotton is fine in summer, but in winter it is “considered a no-no … because it sponges up water and can chill you”: pick merino or a synthetic base layer for a cold day you will be walking in.

Rain, snow and sun

Rain: the outer layer becomes a waterproof jacket or trench (“if there’s wet weather in the forecast, a sleek rain coat”, Nike), with shoes that can get wet and an umbrella. Snow: a water-resistant coat and water-resistant boots (CDC). Sun: “Sunglasses that block both UVA and UVB rays offer the best protection”, a hat “that has a brim all the way around” (CDC), and a sunscreen “with an SPF rating of 30 or higher” (American Academy of Dermatology).

How warm is an outfit?

Warmth is measured in clo. ASHRAE Standard 55 publishes a value for each garment, and an outfit’s warmth is roughly their sum. The calculator adds up what you wear under the jacket or coat; ASHRAE’s table has no outdoor coats, so the outer layer is not in the number.

Four worked examples

60°F and cloudy: two layers: a long-sleeve top and a light jacket, with jeans and closed shoes. 0.58 clo under the jacket.

40°F, a 15 mph wind and rain: it feels like 32°F, so thermals, a thick sweater, a heavy coat, and a hat, scarf and gloves, with a waterproof outer layer and an umbrella.

92°F and sunny: loose, light and breathable: one airy piece, nothing extra, plus sunglasses, a brimmed hat and SPF 30.

15°C (59°F) in the metric system: the same as 60°F: a long-sleeve top and a light jacket.

Common mistakes

• Dressing for the number, not the wind. A 15 mph wind takes 40°F down to a feels-like 32°F.
• Dressing for noon. Mornings and evenings run colder: carry the layer you will want at 8 a.m. or 8 p.m.
• A heavy parka at 50°F. Three light layers you can take off beat one heavy coat.
• Cotton next to the skin on a cold, active day. It holds sweat and chills you; merino or a synthetic base layer does not.
• Dark, tight clothes in the heat. Loose and light-coloured reflects heat and lets air through.

More on Needle Style

Outfits for the weather: rainy day outfits, outfits for in-between weather, fall outfits, cozy winter outfits, winter coats and casual summer outfits.

Layers quoted from Klodsy’s and Who What Wear’s guides to each temperature, Nike and REI; wind chill and cold and heat safety from the National Weather Service; cold and sun safety from the CDC; sunscreen from the AAD; garment warmth from ASHRAE Standard 55. Checked 2026-09-27.

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