Dunn’s River Falls in December: Weather, Sea Temperature and Crowds

DUNN’S RIVER FALLS · DECEMBER · 18.41° N

The December averages at Dunn’s River Falls run 81.9°F by day and 73.2°F at night, with a sea surface sitting at 83.1°F. Nothing in that set of numbers asks you to plan around it. The month’s real negotiation is with rain and with light: 3.43 inches spread across the month, and the sun gone by 5:36 pm.

What shifts against November is small and measurable. Daytime averages come down 1.5°F, rainfall drops 1.01 inches, and three more days a month stay dry. January goes drier still. So the question for most readers is not whether December works at the falls, but which week they book, and whether Christmas and New Year are worth the company they bring.

On this page

• December weather at the falls81.9°F days, 73.2°F nights, 8.2 wet days
• Water temperature for swimmingAn 83.1°F sea, and what that reading means
• Crowds and prices in DecemberThe holiday fortnight, and what we could not verify
• Things to do at the falls in DecemberThe climb, the beach and Ocho Rios
• A two-day planTwo days built around a 6:31 am sunrise
• December vs November and JanuaryHow the three months compare, line by line
• Is December a good month to go?Who should come, who should shift four weeks

Every figure here comes from two places, and they are not equal. The air normals are an ERA5 reanalysis for 1991-2020, computed for the grid cell at 18.4074° N, 77.103° W, sitting over Ocho Rios about two miles east of the falls, near enough that the same weather reaches both. It is model output, not a thermometer at the site. The sea reading comes from the Open-Meteo Marine API.

Dunn’s River Falls weather in December: average highs, lows and rain days

Over the 1991-2020 period, the ERA5 reanalysis gives December an average high of 81.9°F, an average low of 73.2°F and 3.43 inches of rain for the Ocho Rios cell. Read those as a model’s best answer rather than an airport station reading. No official thermometer stands at the falls, and the nearest grid cell is the honest substitute for one.

Rain shows up on 8.2 days of an average December at 0.10 inch or more. That is roughly one day in four you would notice and 23 days you would not, so a two-week stay should expect three or four of them. None of that keeps a swimsuit dry, and none of it justifies a rain plan for the whole trip. It does justify having one.

Between the average high and the average low sit 8.7°F, which is a narrow spread by any standard. Both ends stay in shorts territory. A 6:30 am start at 73.2°F wants a dry shirt to change into after the climb far more than it wants a jacket, and our packing list covers the rest of the bag.

Converted to local time, the sun on December 15 is up at 6:31 am and down at 5:36 pm: 11 hours 4 minutes of daylight. Light is the constraint of the month, not heat. Anything outdoors, including the drive back if you want to see the road in daylight, ends around half past five.

Can you swim in Dunn’s River Falls in December? Water temperature and conditions

The sea off the falls averages 83.1°F in December, from the Open-Meteo Marine API over 2015-2024. One caveat travels with that number and should not be dropped: it is the mean of daily maxima, not a 24-hour mean, so the true round-the-clock average runs a shade cooler than 83.1°F.

In practice that is water nobody stands beside debating. At 83.1°F the sea reads about ten degrees warmer than the 73.2°F dawn air, so an early swim is warmer in than out. For the river water inside the falls, we hold no temperature reading at all, only the sea it empties into, and we give no figure for the climb rather than guess one.

Our sources carry no wind or wave series for this stretch of the north coast in December, so we describe none. On storm timing, which is a separate question from daily swell, our hurricane season page dates the window.

How busy is Dunn’s River Falls in December? Crowds and ticket prices

December sits squarely in the northern-winter travel window, and its last two weeks carry Christmas and New Year. That much is the calendar. We found no monthly occupancy series and no room-rate series for Ocho Rios, so we crown no month expensive and name no cheapest week. Where December falls in the wider Jamaican year is set out in our best-time guide.

Treat the holiday fortnight the way you would treat any holiday fortnight anywhere: book the room, the flight and the ground transport as one decision instead of three. If you are flying in, the transfers page compares the runs to Ocho Rios and flights from the US covers the routes and the gateways.

We could not verify Jamaica’s lodging-tax rate, so we give no percentage. We could not verify a current admission price or the opening hours at the falls either, and a stale gate fee is worse than no figure at all. What we do hold on spending sits in the trip cost page.

One upgrade genuinely changes December rather than just the bill: the distance between your bed and the gate. With 8.2 wet days on the average month, the useful luxury is being close enough to go on the clear morning instead of the morning you booked six weeks ago.

Things to do in Dunn’s River Falls in December

December’s case against its neighbors is arithmetic. It carries 3.2 fewer wet days than November while the sea still reads 83.1°F, against January’s 82.2°F. Warm water with November’s rain already easing off is the combination the month offers, and it is the reason a day built entirely around water holds up better here than four weeks either side.

The falls are the reason you came, and we have to be plain about the gaps: no admission price, no opening hour and no closing day could be verified, so none appear. Ocho Rios, about two miles east, is the base, the town and the source of the weather figures above. Our Ocho Rios guide carries what is there, and things to do in Jamaica ranks the wider shortlist.

What moves between months at this site is the air rather than the water. The sea gives back 83.1°F in December against 85.1°F in November, a two-degree slide, while the dawn air sits at 73.2°F. That gap of nearly ten degrees between sea and coldest hour is why an early start feels colder out of the water than in it.

On free days, we could not verify any December waiver, reduced rate or no-charge entry at the falls, so we name none. The 5:36 pm sunset over the north coast is the one item on the day’s list that costs nothing.

Dunn’s River Falls in December: a two-day itinerary

Day one runs on light. Sunrise lands at 6:31 am, so breakfast by seven and the climb in the first part of the morning, while the air is still short of its 81.9°F average. Swim after, when the 83.1°F sea feels like the warmer option. Keep the middle of the afternoon for lunch and the beach, then treat 5:36 pm as a hard stop for anything outdoors and put dinner in Ocho Rios after dark.

Day two goes to the town and the coast road, with one day in four statistically carrying measurable rain. If it lands on you, shift the swimming to the afternoon and spend the wet hours in Ocho Rios, or use the day for a longer trip inland, where getting around Jamaica sets out the driving and the taxi options. Rain in December usually costs you hours, not the day.

Dunn’s River Falls in December vs November and January

All five lines move the same way. Highs slide from 83.4°F to 81.9°F to 81.4°F, rainfall from 4.44 to 3.43 to 2.99 inches, wet days from 11.4 to 8.2 to 6.4, and the sea from 85.1°F to 83.1°F to 82.2°F. The three air columns share one source and one period, the ERA5 reanalysis for 1991-2020. The three sea figures come from the marine API on 2015-2024, on a different basis, and should be read as neighbors rather than as the same measurement.

Shift four weeks later into January and you buy 1.8 fewer wet days and 0.44 inch less rain, paying 0.9°F of sea warmth and 1.4°F of night warmth for it. Shift four weeks earlier into November and the sea comes back up 2.0°F with days 1.5°F warmer, at a cost of 3.2 extra wet days and an inch more rain.

Is December a good time to visit Dunn’s River Falls?

Yes for anyone whose day is built on water: 83.1°F sea, 81.9°F air, rain on roughly one day in four. No for two groups. Anyone who needs long evenings will find the light gone at 5:36 pm, and anyone who wants the quietest possible gate is arriving in a month that ends with Christmas and New Year, with no crowd counts available from us to say how much that matters.

If the answer for you is no, January is the shift worth making, and it sits one month over. It cuts wet days to 6.4 and rainfall to 2.99 inches while keeping the sea at 82.2°F, which is under a degree off December. The trade is cooler nights at 71.8°F and a full 1.4°F less warmth after dark.

Set against its two neighbors, December is the one month that still holds the sea above 83°F while already shedding three of November’s wet days.

The last word

Book the water days first and let the sightseeing fill in behind them, because the sea at 83.1°F is the thing December does better than January and the daylight runs out at 5:36 pm either way. One figure we have not served yet belongs in the same calculation: the average December logs half a day at an inch of rain or more, so a genuine soaking arrives about one year in two, and the other 30 days of the month sit at 81.9°F.

Sources & data for this guide

• December air normals 1991-2020 (81.9°F high, 73.2°F low, 3.43 in, 8.2 days at 0.10 in, 0.5 day at 1.00 in) · Open-Meteo / ECMWF ERA5 reanalysis, grid cell 18.4074° N, 77.103° W over Ocho Rios · model output, not a station reading · checked Sep 21, 2026
• Sea surface 83.1°F, mean of daily maxima 2015-2024 · Open-Meteo Marine API · checked Sep 21, 2026
• Sunrise 11:31 UTC and sunset 22:36 UTC on December 15, 11h 04m of daylight, converted to local time · sunrise-sunset.org · checked Sep 21, 2026
• November and January normals · same ERA5 series and same 1991-2020 period as December · sea figures for both months from the marine API, 2015-2024 · checked Sep 21, 2026
• We could not verify admission prices, opening hours or a lodging-tax rate, and we found no occupancy or room-rate series for Ocho Rios, so no figure appears for any of them · itinerary timings are editorial.

To plan your stay

• Best Time to Visit Dunn's River Falls: Weather, Sea Temperature and Rain by Month
• Dunn's River Falls in January: Weather, Sea Temperature and How It Compares to December and February
• Dunn's River Falls in November: Weather, Sea Temperature and How It Compares to October and December
• Dunn's River Falls in February: Weather, Sea Temperature and How It Compares to January and March

Nearby places

• Ocho Rios, Jamaica: Dunns River, the Blue Hole and How to Dodge Cruise Crowds
• Kingston, Jamaica: The Bob Marley Museum, Devon House and Trench Town
• Luminous Lagoon Jamaica: Tickets, Sunset Departures and the Moonless-Night Rule