Short answer: 15 knots is when most sports start working properly, 20 knots is the all-around sweet spot, and 30 knots is where it stops being fun for most people. Below 12 knots you need light-wind gear; above 25 you need small gear and good judgement. The chart below maps every common wind speed to what it feels like and what you can ride in it.
A forecast number on its own tells you nothing. “18 knots tomorrow” only means something once you know that 18 is powered-up on a standard kite, marginal on a big wing, and a great day in a dinghy. This page is the translation layer: what each wind speed does to the water, to the trees, and to your session. (Just need the arithmetic? The wind speed converter does knots to mph, km/h and m/s instantly.)
What each wind speed feels like, by sport
These are the wind speeds you’ll actually see on a forecast, with what each one means on the water and on land — plus the conversions alongside, so the number matches whatever unit your app is set to. Beaufort bands and descriptions match our Beaufort scale in knots reference, so the numbers stay consistent across both pages.
| Knots | mph | km/h | m/s | Beaufort | What it feels like / what you can do |
|---|---|---|---|---|---|
| 5 | 5.8 | 9.3 | 2.6 | F2 light breeze | Leaves rustle, wavelets. Too light for most boards; foilers and light-wind kites only. |
| 10 | 11.5 | 18.5 | 5.1 | F3 gentle breeze | Twigs move, large wavelets. Beginner dinghy sailing, big kites, light wing days. |
| 15 | 17.3 | 27.8 | 7.7 | F4 moderate breeze | Small branches sway, frequent whitecaps. Solid all-round riding for most sports. |
| 20 | 23.0 | 37.0 | 10.3 | F5 fresh breeze | Small trees sway, many whitecaps. The sweet spot: all-around kite, fast dinghy sailing. |
| 25 | 28.8 | 46.3 | 12.9 | F6 strong breeze | Large branches move, foam crests. Powered up. Smaller kites and sails, reef the boat. |
| 30 | 34.5 | 55.6 | 15.4 | F7 near gale | Whole trees in motion, foam streaks. Experts on small gear only. Time to depower. |
| 35 | 40.3 | 64.8 | 18.0 | F8 gale | Twigs break off trees, breaking crests. Survival conditions for most. Stay in. |
| 40 | 46.0 | 74.1 | 20.6 | F8 gale | High waves, hard to walk into. Beyond almost everyone’s limit. Watch from shore. |
Numbers rounded to one decimal. Source: standard nautical conversions (1 kt = 1.852 km/h) and the Beaufort wind scale bands published by the US National Weather Service. For the full Force 0 to 12 scale, see our Beaufort chart.
What’s the minimum wind speed for each sport?
The floor is the number that decides whether you drive to the beach at all, and it’s different for every discipline. These are working ranges, not rules — your weight, your gear size and the water state all move them.
- Wing foiling — from about 12 knots, comfortable by 15. The foil does the work, so the floor is low.
- Kitesurfing — most riders need 12 to 15 knots on a standard setup. Lighter riders on big kites get going nearer 10; heavier riders want 15+. See how much wind to kitesurf for the weight-and-kite-size version.
- Dinghy sailing — pleasant from 8 knots, lively by 15, a handful past 20.
- Windsurfing — around 15 knots for planing on standard kit, and it stays good to 30 with the right sail. Detail in wind speed for windsurfing.
- Paragliding — the opposite problem: you want it light, roughly 5 to 15 knots, and too much wind grounds you. See wind speed for paragliding.
- Surfing — you want wind low or offshore. Anything over about 10 knots onshore starts wrecking the face.
- Drone flying — most consumer drones are rated to around 20 knots, and handling degrades well before the limit. See wind speed for drones.
Need the exact figure in another unit? The wind speed converter does any number instantly, in all four units at once.
What wind speed is too strong?
For most people the ceiling sits around 30 knots. Between 25 and 30 you’re on your smallest gear and working for it. Past 30 the water stops being a playground: foam streaks, hard-to-walk-into gusts, and a much shorter margin for a mistake.
The number that actually hurts you is the gust, not the average. A forecast reading “22 knots” can mean a steady 22 or a 16-to-34 sawtooth, and those are completely different days. That gap is the single best argument for watching a live station instead of a forecast: the average is a prediction, the gust is a measurement.
Set your number once. Download WindUp — the alarm is free — and set your range in whatever unit you think in: knots, mph, km/h or m/s. Add a gust ceiling so a sawtooth day doesn’t get you out of bed for nothing. It rings the moment the live station hits your number, even on Do Not Disturb.
Why do wind sports use knots?
Because one knot equals one nautical mile per hour, and one nautical mile equals one minute of latitude on any chart. That link between speed and the lines on a map made knots the standard for marine navigation centuries ago, and aviation followed. Today every serious wind forecast, from offshore sailing to paragliding, defaults to knots.
That’s why the WindUp app and most wind tools show knots first. If you sail, the unit matches your charts and your VHF forecast. Our sailing guide goes deeper on the wind ranges that suit each boat type, all in knots. You can switch any app to mph or km/h, but the wider community thinks in knots, so it pays to get fluent.
Why the 15-to-25 knot band decides your session
The jump from 15 to 25 knots is the difference between “underpowered” and “overpowered” for most riders, and almost every good session and every wasted drive lives inside it. 18 knots and 24 knots feel like different sports on the same board.
That narrow band is exactly why a forecast is a poor tool for the decision. “20ish tomorrow” won’t tell you which end you’re getting, and by the time you’ve driven out you’ve already spent the morning. A live station reading tells you which one is actually happening, and a threshold alarm tells you the moment it crosses into your range.
FAQ
The questions riders ask most, answered from the ranges above. The short version: 12 to 15 knots gets most sports going, 20 is the sweet spot, 30 is the ceiling, and the gust matters more than the average. For the force-by-force breakdown, the Beaufort chart has it; for the arithmetic in any unit, use the wind speed converter.
