Evidence status: WELL SUPPORTED
We are all technically underneath the weather. Yet only someone with a cold, a hangover or a generally miserable morning is likely to describe themselves as “under the weather”.
This time, the nautical connection is real — although one particularly popular sailor story probably isn't.
The Short Answer
“Under the weather” grew from genuine nautical language.
Sailors used weather to describe the windward side or direction from which the wind was coming, and older expressions such as being “under the weather” could refer to finding shelter from harsh conditions.
The expression became metaphorical in American English around the beginning of the nineteenth century and soon developed the sense of being indisposed or unwell. The popular story that sick sailors were sent beneath the “weather rail” is not supported by the early evidence.
What We Know
English nautical language has been using weather directionally for centuries.
The “weather” side of a vessel was the side towards the wind; the opposite was the lee side.
A related expression can be traced back to John Smith's seventeenth-century seamanship writings, where ships could lie protected during difficult conditions.
The exact wording “under the weather” appears in an eighteenth-century report describing safe anchorage sheltered from bad weather.
By 1803, an American newspaper editor was using “under the weather” metaphorically in a passage stuffed with nautical language.
By 1815, the expression was being used figuratively of something recovering from a difficult condition — in that case, New England's economy rather than a sick person. The sense of being physically indisposed then became established.
How It Became a Habit
The shift is natural.
A ship caught in difficult conditions is struggling.
A person who feels unwell is also not operating normally.
English repeatedly borrows language from physical hardship and applies it to health or mood: we feel low, run down, off colour, or under the weather.
Eventually the maritime imagery disappeared from everyday awareness while the illness meaning survived.
The Story Everyone Tells
The most popular version goes like this:
A sailor became seasick.
The exposed part of a ship was unpleasant, so he was sent below deck — supposedly beneath the “weather bow” or “weather rail”.
He was therefore literally under the weather.
It sounds convincing because every component seems nautical.
What the Evidence Actually Says
The nautical ancestry is strong.
The sick-sailor story is not.
Early examples of “under the weather” concern shelter, difficulty and nautical conditions; researchers have not found a historical trail showing that the expression specifically meant sending an ill sailor below deck.
So this is an excellent example of a story being half right.
WELL SUPPORTED: The phrase has genuine nautical roots.
FOLKLORE: We cannot confidently attribute it to sick sailors being put under a particular deck or rail.
Why It Stuck
It is wonderfully understated.
“I am ill” sounds definite.
“I am under the weather” allows for everything from a headache to a bad night's sleep.
The phrase's original sense of temporarily sheltering from rough conditions also accidentally makes a rather good description of what most of us want to do when we feel ill.
Related Curiosities
- Why Do Sailors Say “Red Sky at Night”?
- Why Is Whistling on a Ship Supposed to Bring Bad Luck?
- Where Did “Bite the Bullet” Come From?
- Why Did Sailors Wear Gold Earrings?
Sources & Further Reading
- Wordorigins.org — detailed chronological tracing from seventeenth-century nautical language through 1786, 1803 and 1815 examples.
- Online Etymology Dictionary — early nineteenth-century dating and nautical usage.
- Phrase Finder — analysis of the popular sick-sailor explanation.
Last checked: 19 September 2026