Read the coast's own weather, not just the town's

A forecast for the nearest town tells you very little about a cliff path three miles along the shore. On the Scottish coast you are dealing with at least three different weathers at once: the regional picture, the local effect of hills and glens, and the sea itself. A beach can be basking and still while the headland half an hour's walk away is taking spray over the top of the cliff. Check the forecast for the exact stretch of coast you plan to walk, not just the nearest town.

Start with three things: wind speed and direction, the timing of rain, and visibility. Specialist hill and coastal forecasts will give you wind at height as well as at sea level, which matters if your route climbs onto open ground between beaches. The inshore waters forecast covers sea state, swell and the chance of fog, and it is worth reading even if you never go near a boat — swell is what makes a low rocky section impassable at high water.

Wind: the single biggest variable

Wind decides how a coastal walk feels, and around 30 mph is where most people stop enjoying it. Add the chill of a sea breeze and a wet jacket, and a mild ten-mile day becomes genuinely cold.

• Direction matters more than speed. An onshore wind pushes you along a beach but funnels spray up cliffs and makes rocky ground greasy. An offshore wind is friendlier underfoot but can flatten you on exposed headlands where nothing shelters you.
• Watch for funnelling. Glens and gaps between hills can turn a moderate breeze into something much stronger at the coast, and it will hit you without warning as you round a corner.
• Check the trend, not just the snapshot. If wind is forecast to rise from 15 to 35 mph through the afternoon, walk the exposed section in the morning or choose a route that stays low and sheltered.

Rain, visibility and the haar

Scottish coastal rain is often showery rather than relentless, which means timing is everything. A three-hour window of dry weather is worth planning the day around; walking straight into a front is not. Look at when the rain arrives, how heavy it is, and — crucially — how wet and slippery the ground will be afterwards.

Visibility is the underrated one. Sea fog, or haar, can drop a familiar coastal path to twenty metres in half an hour, and cliffs have a habit of appearing where you did not expect them. If fog is likely, pick a route with a handrail — a wall, a fence line, a stream, a shoreline that stays on your left the whole way — rather than one that relies on seeing the next marker. Take a compass and know how to take a bearing, even on a low-level walk. Bright sun and haze can be just as disorienting when you are navigating by distant headlands.

Build in escape routes before you set off

An escape route is any way off the coast and back to safety that does not involve completing the original plan. On the coast these are usually better than on the hills, because there is often a road, a track or a village within reach. Find them on the map before you go, and mark at least two.

• Inland links. Tracks from a beach to a minor road, a farm or a bus route give you a clean exit if the weather turns.
• Tide windows. Where the route drops onto the shore, a rising tide can close the way back. Know the high-water time for your section, not just for the nearest harbour.
• Terrain shortcuts. A path across a headland may save you a long beach, but only if it is not a bog or a boulder field. Check the contours first.
• Mobile signal gaps. Assume there will be none. Tell someone your route and expected return, and carry a means of calling for help that does not rely on having bars.

Turn-back points: decide them while you are still dry

Write down three or four turn-back points and the conditions that trigger them, then hold to them. Decide them at the kitchen table, when you are warm and reasonable, not on a wet headland when you are forty minutes from the car and reluctant to give up.

Useful triggers include: wind strong enough that you are being pushed off your line; spray making rock greasy; visibility dropping below a couple of hundred metres; a member of the group getting cold, tired or slow; or the tide turning earlier than expected. Turning back is never a wasted day. It is the skill that keeps you walking for decades rather than seasons. If you have walked three miles and turn around, you have still had a six-mile walk and a good look at the sea.

Small habits that keep a good day good

• Carry a paper map and compass as well as a phone. Batteries fail in the cold.
• Pack a warm layer and a hat for the headland even if the beach is warm — wind chill can take 10°C off how a day feels.
• Take more water than the distance suggests; coastal ground is often rougher and slower than the map implies.
• Have a short alternative route saved for the day the forecast is wrong. A two-mile walk with a good view beats a ten-mile slog in sideways rain.
• Check the tide, the sunset time and the wind direction again at the start of the walk. Conditions change faster on the coast than almost anywhere else.

Plan for the weather you might get rather than the weather you want, and the Scottish coast rewards you with some of the finest low-level walking in Britain.