What to wear in 40 degree weather
40 °F (4 °C) is cold. Wear a sweater or a sweatshirt with jeans or trousers under a warm coat, with boots or closed shoes and a scarf. In rain, pick a coat that keeps the water out and leave the canvas sneakers at home.
Last updated: November 3, 2026
The short answer: layers under a warm coat. 40 °F is in the same band as freezing for StyleTwin (45 °F, 7 °C, and below), so dress almost as you would for 30 °F, minus the thermals.
What to wear at 40 °F
- Top: a sweater, a sweatshirt, or a long-sleeve top under a cardigan.
- Bottom: jeans or trousers. Tights under a skirt or a dress.
- Coat: wool, a puffer or a lined trench. A blazer or a denim jacket on its own will feel thin.
- Shoes: ankle boots, leather sneakers, or loafers with socks.
- Extras: a scarf, and gloves for a long walk.
When it rains at 40 °F
Cold rain feels colder than dry cold. Wear a coat that keeps the water out, boots rather than suede or canvas, and a sweater under it rather than a shirt.
Here StyleTwin’s sample closet meets a rainy 41° day that runs from 37° to 45°. Four of its ten saved outfits fit, and Cool morning comes first: a striped sweater and straight jeans under a trench coat, with brown ankle boots.
The trench counts as warm because that’s how it’s tagged in this closet. A piece is as warm as its tag says, and you can change the tag at any time. Rain works the same at every temperature: snow, sleet and a 50% chance of rain count too, looks made only of light pieces drop out, and a coat goes on.
Layers you can take off
A 40 °F morning often turns into a 50 °F afternoon. Wear a sweater you can take off and a coat you can open. When the forecast shows a cold start, StyleTwin’s card says when it ends, like “Cool until 10 AM, keep the blazer on.”
Other temperatures
- What to wear by temperature: the whole chart, from freezing to 80 °F and up.
- 30 degree weather · 50 degree weather · 60 degree weather · 70 degree weather
Questions
Is 40 degrees cold?
Yes. At 40 °F (4 °C) you need a warm coat over your layers, closed shoes and a scarf.
What should I wear in 40 degree weather with rain?
A coat that keeps the water out, or a lined trench, over a sweater, with jeans or trousers and boots.
Can I wear a dress in 40 degree weather?
Yes, with thick tights, boots and a warm coat. A knit dress works better than a light one.
What does StyleTwin suggest for a 40° day?
Looks from your own closet that are warm enough for it, with a coat from your closet on top. On a rainy day it leaves out looks made only of light pieces.
More about StyleTwin
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