How wind affects your Strava times — and how to use it

Ride the same segment on the same legs and the same day of the week, and your time can still swing by a lot — not because your fitness changed, but because the wind did. Aerodynamic drag rises with the square of your speed relative to the air, so a headwind doesn't just slow you down proportionally — it costs you disproportionately more the faster you're trying to go. A tailwind works the same way in your favour.

Why wind matters more than most riders think

On a flat or rolling segment ridden at 35–40 km/h, most of the resistance you're fighting is air, not gravity or rolling resistance. A 15 km/h tailwind at that speed can be worth tens of seconds on a short segment, and minutes on a longer one — often more than a noticeably "good day" in the legs would get you. That's why so many Strava KOMs and PRs cluster on specific days: the riders weren't necessarily fitter that day, the wind was just working with them.

How to check the wind before you go for it

A general city forecast isn't enough — wind direction relative to a segment's exact bearing is what determines whether it's a tailwind or a headwind, and that can flip several times along a twisty climb or a segment that changes direction. What you actually want to know is: given this segment's shape, will the wind help or hurt at each point along it, and how does that compare to the conditions you set your current PR in?

That's the specific question Segment Hunter answers. Connect Strava, and it finds your PR on each starred segment, looks up the actual wind you rode it in, and ranks the next few days' hours by how much the forecast wind would help versus that baseline — so you know before you leave the house whether today is worth a hard effort.

A few practical tips

• Longer, straighter, and more exposed segments are affected by wind more than short, sheltered or heavily wooded ones — prioritise checking wind for those first.
• Wind direction near dawn is often more stable than in the afternoon, when local thermal effects and daily heating can make it shift or gust more.
• A slight crosswind can still give a partial tailwind or headwind component depending on the segment's bearing — it's rarely all-or-nothing.

Ready to see it for your own segments? Try Segment Hunter.