Is it safe to boat in the rain?

Rain by itself is a comfort problem, not a safety problem. You get wet, the day is less pleasant, and that is mostly it. What makes rain dangerous is what usually comes with it: lost visibility, wind, lightning, and a crew that gets cold faster than anyone expected.

The real risk is visibility

Heavy rain can cut visibility to a few hundred metres, and it does it quickly. Suddenly you cannot see other boats, channel markers or the shoreline, in exactly the conditions where everyone else is also struggling to see you.

What to do when it closes in:

• Slow down to a speed at which you could stop within what you can see.
• Turn on navigation lights, regardless of the time of day.
• Post a lookout and keep talking — sound carries when sight fails.
• Use sound signals in restricted visibility as required by the rules.
• Watch the plotter and depth sounder, and if you have radar or AIS, this is what they are for.

Lightning is the actual danger

If there is thunder, the answer changes completely: a boat is often the tallest object on a flat surface. There is no arguing with that.

• Head for shore or shelter as soon as you hear thunder, before the storm arrives.
• If you cannot, stay low, in the centre of the boat, away from metal fittings, the mast and rigging.
• Disconnect and stow handheld electronics.
• Do not stand on the swim platform, in the water, or hold anything metal.

Squall lines can arrive fast and bring a sharp wind shift with a sudden 30-knot gust ahead of the rain. The gust front, not the rain, is what capsizes small boats.

The other things rain brings

Cold. Wet plus wind removes body heat quickly, even in summer. Hypothermia on a warm day is a genuine and underestimated risk, and it degrades judgement before it produces obvious symptoms.

Slippery decks. A wet deck is where most on-board injuries happen. Move deliberately, keep one hand for the boat.

Water accumulating aboard. An open boat in sustained heavy rain takes on a surprising volume. Check that the bilge pump works before the day you need it, and keep the scuppers clear.

Reduced grip on everything. Wet lines, wet fenders, wet hands: docking in rain is harder than docking in sun, and it is worth approaching more slowly than usual.

So, do you go?

Steady, light rain with good visibility and no thunder: yes, with foul weather gear, lights on, and a slower pace. Heavy rain, or rain with wind, or any thunder in the forecast: no — or if you are already out, head in early rather than waiting to see how it develops.

The rule that keeps people out of trouble is simple: rain that arrives with wind is a different event from rain that arrives alone. Look at what the front is doing, not just at the raindrops.

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