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Cornwall Weather in December: What to Expect and What to Pack

Quick answer: December in Cornwall is the mildest midwinter in mainland Britain — daytime highs around 10–11°C, rare frost, real storms, and the shortest days of the year wrapped around the county’s cosiest traditions: Mousehole’s famous harbour lights, Padstow’s Christmas festival, Boxing Day beach walks and the bravest swimmers in the sea. It’s not a beach holiday; it’s firesides, twinkling harbours, empty coast paths and the year’s best prices. What the weather really does, what to pack, and what our family’s Cornish Christmas actually looks like — below.

December closes the Cornish weather year the way it opened: mild, wet, dramatic and quietly beautiful. The county is at its emptiest and its most itself — harbour villages string lights against the Atlantic dark, and the visitors who do come get famous places almost to themselves. If November is Cornwall’s quiet month, December is its candlelit one: the same weather, dressed for the season.

Table of Contents

  1. December weather at a glance
  2. Temperature and light
  3. Rain, wind and storms
  4. The sea in December
  5. What to wear and pack for Cornwall in December
  6. What to do in Cornwall in December
  7. Personal insights and experiences
  8. FAQ
  9. References and resources

December weather at a glance

  • Average daytime high: around 10–11°C (50–52°F) — the mildest December on the British mainland
  • Average overnight low: around 5–6°C (41–43°F); coastal frost and snow stay genuinely rare
  • Sea temperature: roughly 11–12°C — cold now by any honest measure
  • Rainfall: around 110–140mm on 15–18 days; peak storm season continues
  • Daylight: the year’s shortest — about 8 hours around the solstice, with sunset before 4.30pm
  • Crowds: minimal, with cheerful bumps around the light festivals, Christmas markets and the famous New Year celebrations

Temperature and light

While upcountry Britain scrapes ice, coastal Cornwall usually just zips its coat: double-figure afternoons are normal, hard frost is an event, and snow that settles makes the local news. The trade is light — there simply isn’t much of it. The sun, when it shows, barely clears the hedges all day, which produces the year’s longest golden hours and its earliest evenings. The December skill is the November one, concentrated: be outdoors for the bright middle of the day, and have somewhere glowing to be by four.

Rain, wind and storms

December sits in the heart of storm season: Atlantic fronts arrive in convoy, rain falls on more days than not, and a named storm or two usually calls before New Year. Between them come the still, rinsed, blue days that make the whole month worthwhile. Storm-watching rules apply at full strength — big seas take spectators off harbour walls and headlands every winter, so admire from proper distance, check the Met Office before you drive anywhere dramatic, and let the county’s cafés do what they were built for.

The sea in December

At 11–12°C the sea has stopped pretending. Surfers in winter rubber still feast on the swells, and Cornwall’s Christmas and New Year’s Day charity swims remain gloriously popular — hundreds of people, many in fancy dress, screaming their way into the shallows for good causes — but those are dashes, not swims, with crowds and organisation around them. For everyone else the sea is December’s scenery: never turn your back on it on a storm beach, and mind the spring tides around the full and new moons.

What to wear and pack for Cornwall in December

  • The November kit, plus cheer: serious waterproof, warm layers, hat and gloves, boots or wellies as default.
  • A head torch each — dark by 4.30pm means every afternoon plan has a night walk hidden at the end of it.
  • The flask, promoted to essential — harbour-lights viewing is an outdoor sport.
  • Something smart-ish if festivals or New Year in a harbour town are on the cards; something ridiculous if you’re joining a Christmas swim.
  • Indoor ammunition, family strength: games, books, a jigsaw with a reputation. December evenings are the year’s longest and, done right, its best.

What to do in Cornwall in December

  • Mousehole harbour lights — mid-December onward, the most famous Christmas lights in Cornwall: a tiny granite harbour strung with illuminated shapes reflected in the water, honouring among other things Tom Bawcock’s Eve (23 December), the village’s legendary stargazy-pie feast. Go on a weeknight, wrap up, take the flask.
  • Padstow Christmas Festival — early December: chef demonstrations, market stalls and a harbour town in full voice; book beds early, it’s the month’s big draw.
  • Christmas by the harbour generally — Charlestown’s Georgian harbour and tall ships (familiar from our pirates guide) do atmospheric midwinter beautifully, and a harbourside meal in December costs a fraction of its August self.
  • Boxing Day walks and swims — the county’s great collective exhale: beaches full of families, dogs and questionable jumpers, with organised dips at many resorts.
  • The wildlife shift — murmurations near their peak, huge seal haul-outs, estuaries full of wildfowl: our wildlife calendar has the where and when.
  • Firesides and food — the month the comfort end of Cornish food and the fireside storytelling tradition were made for.
  • New Year’s Eve — Cornwall’s harbour-town celebrations (St Ives and Looe are famous for full-town fancy dress) are legendary; plan accommodation months ahead or enjoy the village version.
  • Book smart — December outside the festivals is the year’s best-value week away; our where to stay guide maps the areas.

Personal insights and experiences

Our family’s December has one fixed Cornish star: Boxing Day at my parents’ in Launceston, every year without fail. It’s the same visit the November guide’s farm-lane loop belongs to, in its winter dress — the walk shorter and darker, the lanes shining, the castle on its mound against a four-o’clock sky, and the homecoming twice as warm for the cold. That’s the honest local truth of a Cornish December: it’s less about doing and more about returning. Beyond the fixture, Charlestown is our December treat — we’ve eaten there a few times over the years, and a Georgian harbour with tall ships needs remarkably little tinsel to feel like a film set. And one aspiration I’ll declare openly, since this page gave me the excuse to research it: Mousehole’s lights. I’ve seen that little harbour glowing in a hundred photographs and never yet with my own eyes — the harbour looks perfect, it’s firmly on the family list, and when we finally make the pilgrimage, this article gets its update, flask in hand.

FAQ

Q: Is Cornwall worth visiting in December?
A: For the right trip, absolutely: harbour lights, festivals, empty coast paths, storm drama and the year’s lowest prices. For beaches and long days — no, and it doesn’t pretend otherwise.

Q: How cold is Cornwall in December?
A: The mildest December on the British mainland: days around 10–11°C, nights 5–6°C, frost rare on the coast and settling snow rarer still. Wind and rain do the real chilling.

Q: When are the Mousehole Christmas lights?
A: The harbour lights traditionally switch on in mid-December and run into the new year, with Tom Bawcock’s Eve celebrated on 23 December. Check the village’s own announcements for exact dates and the quiet-night etiquette.

Q: Is anything open in Cornwall at Christmas?
A: Pubs, plenty of restaurants (book ahead for the days around Christmas), and the outdoors — beaches, coast paths and gardens don’t close. Big attractions run winter hours; always check before travelling.

Q: What’s Cornwall like at New Year?
A: Famous: harbour towns like St Ives and Looe turn out in full fancy dress for street celebrations. Accommodation books out months ahead; the village-pub version is just as warm.

References and resources