How to run in the rain

The honest answer: most rain is fine

Rain by itself is rarely what makes a run miserable. What makes a run miserable is being cold and wet, chafing, or unable to see. Those are three separate problems, and only one of them is really about the rain.

A 12°C drizzle in a technical t-shirt is genuinely pleasant — arguably better than the same run in sun, because you are not fighting to shed heat. A 4°C downpour with a 30km/h headwind is a different proposition, because moving air over wet skin strips heat far faster than still air does. The rain has not changed. The wind and the temperature have.

So the useful question is never “is it raining?” It is “how hard, how cold, how windy, and for how long?” That is exactly what the RainOrRun verdict scores, and it is why a 90% chance of light drizzle can come back as Go while a 50% chance of heavy showers comes back as Maybe.

Before you go: five minutes that decide the run

1. Check the hour, not the day

A daily forecast that says “rain” is close to useless for a runner. Rain is rarely continuous — a day marked 70% often means two wet hours and eight dry ones. Look at the hourly breakdown and move the run rather than cancel it. Shifting a 6pm run to 7:30pm costs you nothing and is frequently the difference between soaked and dry.

2. Dress for 10 degrees warmer than it is

The standard rule for running in any conditions applies doubly in rain: you should feel slightly cold in the first five minutes. If you are comfortable standing on the doorstep, you are overdressed, and overdressing in rain is worse than overdressing in dry weather because damp fabric holds heat badly once you stop.

3. Do not wear cotton

This is the one genuinely non-negotiable rule. Cotton absorbs many times its weight in water, holds it against the skin, loses effectively all its insulating value when wet, and creates the friction that causes chafing. A cotton t-shirt is the single most common reason people decide they hate running in the rain. Any synthetic or merino base layer behaves completely differently.

4. Lubricate anywhere that repeats

Wet fabric against skin, thousands of times, is what causes chafing — not distance. Anti-chafe balm or plain petroleum jelly on inner thighs, underarms, nipples and anywhere a seam or strap sits will prevent almost all of it. This takes twenty seconds and is the difference between a good wet run and a shower afterwards that makes you shout.

5. Put a cap on

A peaked running cap is the highest-value piece of rain kit there is, and almost nobody wears one. It keeps rain out of your eyes, which is the thing that actually stops you being able to see, and it does so at a fraction of the weight and cost of a jacket. In anything above light drizzle it matters more than the jacket does.

What to actually wear

The full breakdown is in our guide to what to wear running in the rain, but the short version by temperature:

• Above 15°C — technical t-shirt and shorts. No jacket. You will be wet either way; a jacket at this temperature just makes you wet from the inside instead.
• 8–15°C — technical long sleeve, shorts or light tights, cap. A light shell only if it is windy.
• 3–8°C — base layer, waterproof shell, tights, gloves, cap. This is the band where getting it wrong genuinely costs you.
• Below 3°C — as above plus a headband or beanie, and take the wind seriously. Cold rain is the most dangerous combination in this list, more so than snow.

Running technique in the wet

Very little changes, but three things are worth knowing.

Shorten your stride slightly. Wet surfaces reduce grip, and most slips happen at the point of maximum reach in front of the body. A marginally quicker, shorter stride keeps your foot landing closer under your centre of mass, which is more stable.

Treat painted lines and metal as ice. Road markings, manhole covers, drain grates, wooden bridges and tiled underpasses are dramatically more slippery when wet than the surface around them. This is where wet-weather falls actually happen, not on ordinary tarmac.

Take corners wider and slower. Reduced grip matters most under lateral load. Straight-line running in rain is close to normal; cornering is not.

You do not need trail shoes for wet roads — road shoes have plenty of grip on wet tarmac. Trail shoes earn their place when you are on genuinely soft, muddy or grassy ground, where road outsoles clog and slide.

Visibility is the real risk

Rain does not just reduce what you can see. It reduces what drivers can see, dramatically — a windscreen in heavy rain at dusk is close to the worst visual environment there is, and spray from other vehicles compounds it. Meanwhile most running kit is dark.

A high-vis vest costs very little and is the single most effective safety item for wet-weather running. Reflective detailing on a jacket is not a substitute — it only works when headlights hit it directly, which on a bend is exactly when it does not.

Afterwards: the bit people get wrong

What you do in the ten minutes after a wet run matters more than most of the run itself.

Change immediately. You stop generating heat the moment you stop running, and wet kit will chill you fast — this is where post-run colds get blamed on the rain. Get dry clothes on before you do anything else, including stretching.

Never put running shoes on a radiator. Direct heat degrades the adhesives and warps the midsole foam, which is the part you actually paid for. Instead: pull the insoles out, loosen the laces fully, stuff the shoes loosely with newspaper or kitchen roll, and leave them somewhere with moving air. Replace the paper after an hour. They will be dry by morning and unharmed.

Rinse them if it was salty or muddy. Road salt in winter and grit in mud both break down uppers over time. A rinse under a cold tap costs nothing.

Two pairs is the real fix. If you run in the rain regularly, rotating two pairs of shoes means one is always dry, and the alternating drying cycle measurably extends the life of both.

When you genuinely should not go

Rain is almost never the reason. These are:

• Lightning. Non-negotiable. Thunderstorms are the one weather condition where the correct answer is always no — the risk is small but the consequence is absolute, and there is no kit that changes it.
• Freezing rain or ice. A wet run is an inconvenience; a fall on ice is an injury. Black ice after overnight rain is the single most common cause of serious winter running injuries.
• Flooding or standing water. You cannot see what is under it, water moves faster than it looks, and urban floodwater is contaminated.
• Cold rain plus strong wind, on a long run. A wet 30 minutes at 4°C is fine. A wet three hours at 4°C in a headwind is a genuine hypothermia risk, especially if your pace drops late on and you stop producing as much heat.

Everything else is a kit problem, not a weather problem.

Does running in the rain make you ill?

No. Colds are caused by viruses, not by being cold or wet — this is one of the most persistent myths in running. What being cold and wet for a long period can do is place a temporary load on you at the same time as hard training does, and it is that combination, not the water, worth managing. Change promptly, eat, and it is a non-issue.

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