What to Wear Running in the Rain: A Cap, the Right Jacket (Sometimes), and No Cotton

Most advice about running in the rain starts with a jacket. That is the wrong place to start, because the jacket is the one piece you often should not wear.

Here is the problem. You produce a great deal of heat and sweat when you run, and no fabric lets all of it out while keeping all of the rain off. Put on a waterproof jacket in warm rain and you will finish just as wet as you would have without it, only hotter. The goal in the rain is not to stay dry. It is to stay warm enough, see where you are going, and finish without raw skin.

This guide works through that in order: what to wear at each temperature, when a jacket earns its place, what the numbers on a waterproof jacket mean, and the small things (a cap, socks, balm) that matter more than the big one.

How We Chose

This is a buying guide built from listing specifications and the running guides this site already publishes, not from wear testing. The jacket, cap, and balm picks were chosen in September 2026 from listings that were in stock and sold by the brand or by Amazon, and the figures quoted for them are the ones their listings state. The Under Armour jacket and the Swiftwick socks come from our running jackets guide and compression socks guide.

What to Wear in the Rain, by Temperature

Rain matters less than the temperature it arrives with. Warm rain is a comfort problem. Cold rain is a safety one, because wet skin loses heat far faster than dry skin.

Below 40°F in steady rain is riskier than most runners expect, often more so than dry cold well below freezing, because soaked clothing stops insulating. Stay close to home, run loops rather than an out-and-back, and have dry clothes ready. For the dry-cold version of this chart, see our winter running gear guide.

Two rules apply at every temperature:

• No cotton. Cotton holds water, gets heavy, sags, and rubs. Our cotton vs polyester guide explains why.
• Fitted beats loose. Wet, loose fabric flaps and chafes. A close-fitting technical top stays put.

Start With a Cap

The most useful piece of rain gear is a hat with a brim. Rain in the eyes makes you squint, drop your head, and tense your shoulders, and on a long run that is more tiring than being wet. A brim fixes it.

The adidas Superlite Hat is a light, moisture-wicking cap with an adjustable hook-and-loop closure that the listing says fits 21 to 24 inch heads, and a non-glare undervisor. It is not waterproof and does not need to be. A running cap's job in the rain is to be a brim that dries quickly afterwards. Any light synthetic running cap does the same job; avoid cotton baseball caps, which soak and stay heavy.

In cold rain, the cap goes under your jacket hood, where the brim also stops the hood from falling over your eyes.

When a Jacket Helps, and When It Does Not

Above about 50°F, skip it. You will be wet from rain without one and wet from sweat with one, and the second is hotter. Our half marathon guide makes the same call for race day: a fitted shirt and a cap beat a rain jacket.

Below about 50°F, or whenever there is wind, wear one. Now the jacket is not keeping you dry. It is keeping wind off wet skin, and that is the difference between uncomfortable and dangerously cold.

Which kind depends on the rain:

• Showers and drizzle: a water-repellent wind shell such as the Under Armour Storm Qualifier. It breathes better than a membrane jacket and packs into its own pocket. It is a finish rather than a membrane, so sustained rain soaks through.
• Steady rain: a membrane jacket with sealed seams. The baleaf men's packable rain jacket and baleaf women's packable rain jacket both list a 5,000mm waterproof rating, a hood, back vents, and a pack-into-pocket design. The women's listing gives a weight of about 285g and says it is fully seam-sealed; the men's adds reflective stripes.

What the Waterproof Numbers Mean

Rain jackets quote two figures, and for runners the second matters as much as the first.

• Waterproof rating (mm). The height of a column of water the fabric holds back before it leaks. Around 5,000mm is generally treated as the entry level for a waterproof jacket, good for light to moderate rain. Shells built for prolonged heavy rain are usually rated 10,000mm and up.
• Breathability (g/m2/24hr). How much water vapour passes out through a square metre of fabric in a day. Both baleaf jackets list 3,000g, which is on the low side. Walking, that is fine. Running hard, you will make sweat faster than it can leave, and the inside of the jacket will be damp.

That is not a flaw in these two jackets so much as the honest trade at their price. Jackets that breathe much better exist, and they cost several times as much. For most runners who need a rain shell a dozen times a year, vents and a front zip you can open do most of the same work: unzip as soon as you warm up.

Socks and Shoes

Your feet are going to get wet. Waterproof shoes keep rain out until water runs down your leg into them, and then they keep it in. For most rain running, ordinary mesh shoes that drain are the better choice.

Socks decide whether wet feet blister. Thin synthetic or merino socks hold less water and keep their shape; thick cotton ones turn into a sponge. The Swiftwick Aspire Twelve is the sock our winter guide recommends for rain and slush above freezing for exactly that reason: it is thin, and it dries quickly. For cold, wet days where warmth matters more, the same guide covers a merino option.

After the run, pull the insoles out, stuff the shoes with newspaper, and leave them at room temperature. Keep them away from radiators and dryers, which break down midsole foam and glue. Our running shoe replacement guide covers what else shortens a shoe's life.

Chafing: The Real Rain Problem

Wet fabric grips skin instead of sliding over it, so everything that chafes slightly on a dry day chafes badly on a wet one. This, not the rain itself, is what people remember about a bad rainy run.

Before you head out, put an anti-chafe balm such as Body Glide Original on the inner thighs, underarms, along a sports bra band, on nipples, and anywhere a seam or waistband sits. Body Glide's listing says it is made without petroleum or oils, can be used on feet as well, and washes off with soap. Feet are worth doing on long wet runs: a thin layer between the toes and on the heel helps against blisters.

Be Seen

Rain means dull light, spray, and drivers looking through wet windscreens, even at midday. Choose the brightest top you own, and if you run near traffic in the rain regularly, add something reflective. Our reflective running gear guide covers what works.

After the Run

• Get out of wet clothes within a few minutes. You cool quickly once you stop.
• Rinse or wash kit soon. Wet technical fabric left in a bag is how permanent smell starts; our sweat smell guide covers the rescue if it is too late.
• Hang a rain jacket to dry fully before packing it away. Skip fabric softener, which clogs water-repellent finishes.

Frequently Asked Questions

Is it OK to run in the rain?

Yes. Rain itself does no harm, and many races are run in it. The real risks are getting cold in rain below about 50°F, slipping on painted lines, metal covers, and wet leaves, and lightning. If there is thunder, run later or indoors.

Should I wear a rain jacket when running?

Only when rain comes with cold or wind, roughly below 50°F. In warmer rain a jacket traps heat and sweat, and you finish just as wet. When you do wear one, choose one with vents and open the zip once you warm up.

What does a 5,000mm waterproof rating mean?

It means the fabric held back a 5,000mm column of water in testing before leaking. That is generally treated as the entry level for waterproof jackets and suits light to moderate rain. Jackets for long periods of heavy rain are usually rated 10,000mm or higher.

Are waterproof running shoes worth it in the rain?

Usually not. They keep out splashes and wet grass, but in steady rain water runs down your legs into the shoe and cannot drain out. Regular mesh shoes with thin, quick-drying socks are more comfortable for most rainy runs.

How do I stop chafing when running in the rain?

Wear fitted technical fabrics rather than loose or cotton ones, and apply anti-chafe balm to thighs, underarms, bra band, nipples, and seam lines before you leave. Wet fabric chafes far more than dry, so use it even on routes where you normally would not.

The Bottom Line

Dress for the temperature, not for the rain. In warm rain, wear as little as you would on a dry day and add a brimmed cap and anti-chafe balm. Below about 50°F, or in wind, add a light shell: water-repellent for showers, a 5,000mm membrane jacket for steady rain. Accept that you will be wet, and make sure you are warm.