Once the wind hits 15 mph, the air does more damage to your cast than the spool tension settings. The lure drifts, the line loops up, and you get backlashes you would never get on a calm day. The fix is not a heavier cast. It is three changes: heavier line, tighter spool tension, and a different release point. Walk through them in that order and your accuracy at 15 to 25 mph will come back to within a foot of calm-water range.
Light line is the first thing wind eats. If you run 6 or 8 lb class in calm conditions, move to 10 to 12 lb class (or the braid equivalent) for anything above 15 mph. Heavier line cuts through the air instead of being blown around. It also gives your brake system more drag to grip on during the cast, which keeps the spool from free-wheeling on the downswing.
In wind the spool turns faster on the backswing because the line is catching air. Add one to two clicks of spool tension over your normal calm-water setting. You are not tightening the drag; you are tightening the star drag or spool tension knob so the spool resists free rotation a little more. The goal is that the spool should tick on the backswing but not spin out on the downswing.
Lift the rod to the top of your backswing and hold it there for two seconds. The spool should tick a few times, then stop. If it keeps ticking, tension is too loose. If it does not tick at all, it is too tight and you are fighting the line on the downswing, which causes the backlashes you are trying to avoid.
If you have a centrifugal brake reel, switch to it for anything above 15 mph. The centrifugal brake only engages when the spool is actually turning fast. That means it gives you more control during the fast, wind-assisted downswing and less resistance during the slow backswing. A magnetic brake applies constant force regardless of speed, which is fine on calm days but fights you at higher wind speeds.
This is the biggest technique change for wind casting. In calm conditions you release the line at about 45 degrees in front of you. In wind, release further forward, at 30 to 40 degrees. The reason: the lure is being pushed in the wind direction. By releasing earlier and further forward, you position the lure so the wind carries it down and forward instead of sideways or back at you.
When casting into the headwind, your range drops by roughly a third at 20 mph. Release the line earlier in the downswing so the lure clears the rod tip before the headwind pushes it back. Aim at the target, not where you think the wind will blow the lure.
Crosswind is the trickiest. The lure drifts across your line and the loop forms on the downwind side. Two options: either cast with a short, controlled release and let the wind do the last part of the travel (you land short of where you aimed), or use a shorter cast and hand-place the lure to the far bank. The second option is less fun but more accurate in sustained crosswinds.
Downwind is where the wind helps. The air carries the lure further than you need to. The risk is overshoot. You can reduce your cast power by 20 to 30 percent at 15 mph and still hit a target you would normally need full power for. Keep spool tension on the tighter side so the spool does not spin out on the longer downswing.
Do not try to match your calm-water cast distance in the wind. You will overshoot, tangle the line, and spend ten minutes untangling. Do not crank spool tension to maximum thinking that will stop backlashes. It will, but it will also stop your cast on the backswing and the lure will not come off the tip. The goal is spool ticking on the backswing, a clean release, and a slow spool on the downswing. Not zero ticks.