Best activities to do in December in Watamu

The best thing to do in Watamu Marine Park in December is dolphin watching. Bottlenose pods live on the Watamu Banks all year. Water is about 28°C. Visibility is often around 23 metres, so a snorkel stop still makes sense after the dolphin run. December scores 44 on the Experience Index.

Overview of Watamu Marine Park by Month

Why visit Watamu this month?

December scores 44 out of 100 on our Experience Index. That is our internal scoring system for the best month to visit Watamu. Four signals make the total: humpback whales, whale sharks, resident dolphins and snorkeling visibility. December is a selective window.

Each bar is that activity’s weight multiplied by this month’s probability. The four results add up to the index.

Humpback whales 0 pts

Weight 35 × 0.0

Whale sharks 5 pts

Weight 25 × 0.2

Resident dolphins 20 pts

Weight 20 × 1.0

Snorkeling visibility 19 pts

Weight 20 × 1.0

Wildlife in December in Watamu

The figures below describe a typical week on the water in December, not a promise for your Tuesday. Captains still confirm what the sea did that morning before you leave the beach.

Wildlife chances in December in Watamu Marine Park
Wildlife	Chance	What that means in December
Humpback whales (breaching)	0%	Humpbacks are in the Southern Ocean. December is not a whale month.
Humpback whales (mothers & calves)	0%	No calves in Watamu until the next mid-year arrival.
Bottlenose dolphins	100%	Resident and highly visible in glassy water — the everyday mammal highlight.
Whale sharks	20%	Building, not peak. A sighting is luck plus local knowledge, not a seasonal lock.
Manta rays	50%	Improving on cleaning stations as plankton and warmth line up.
Green sea turtles (nesting / hatching)	85%	Prime nesting. Follow conservation rules; unguided beach walking at night is how nests fail.
Mida Creek migratory birds	100%	Overwintering flocks still occupy Mida Creek at low tide.

Snorkeling and diving in December

Optimal reef snorkeling and diving conditions. Kaskazi typically flattens the surface and lifts water clarity toward 23 metres — pool-like visibility on settled mornings. This is the window for snorkeling the outer coral gardens and, when certified and conditions allow, diving sites such as Vuma Caves. Morning low-tide slots still give the sharpest views.

Holiday-season water is typically excellent: 20 m+ on settled days, with the usual caveat that a short-rains hangover can colour the lagoon after a storm.

Ocean conditions in December

December is mature Kaskazi: ~28°C, calm surface, high visibility. Humpbacks are gone. Whale sharks are still a few weeks from their statistical peak, though the plankton setup is starting. Turtles are nesting. The marine park is in its classic “warm, clear, dolphin” mode that most first-time visitors actually wanted when they typed “snorkeling Watamu” — just not the mode they get if they come in August instead.

December water and weather snapshot for Watamu
Measure	This month
Monsoon	Kaskazi (NE)
Water temperature	28°C
Typical visibility	23 m
Sea surface	Calm / Glassy

Which Watamu boat trips fit December

Wind, visibility and wildlife this month decide which trips make sense. The table maps the packages people actually book in Watamu onto those conditions.

Boat trip fit for December in Watamu
Trip	Fit this month	Why
Humpback whale safari	Not in season	Humpbacks have not arrived yet, or they have already left for Antarctic feeding grounds.
Whale shark watch	Off-peak	Whale sharks are rarely reported close to shore this month.
Glass-bottom coral gardens	Optional extra	Clear water favors snorkeling; glass-bottom boats remain useful for children and non-swimmers.
Deep sea fishing	Moderate	Calmer Kaskazi water is pleasant on a boat, but pelagic action is usually quieter than in the Kusi months.
Kitesurfing (Garoda)	Light / inconsistent	Kaskazi is warmer and flatter — better for swimming than for powered kites.
Mida Creek dhow cruise	Recommended	A creek dhow cruise is a calm contrast to the marine park, with birdlife on the mudflats at low tide.

What to pack for a December marine day

December packing is about the sea state above, not a generic beach list. Take what the month actually asks for.

Rash guard and high-SPF reef-safe sunscreen — December sun is not gentle
Hydration on the boat; humidity is high
Smart casual for hotel Christmas traffic, not for the reef
Head torch for a permitted turtle-beach briefing if offered

Local captain’s note for December

December boats fill with holiday guests who all want the same 9 a.m. slot. Book the private package and the early departure; you will share the coral gardens with fewer hulls and see the same dolphins with less wake.

Book a boat in December

Choose half day or full day. Both links open the booking form with that trip already selected.

Book a half day Book a full day

FAQs on Visiting Watamu in December

Is December a good time to visit Watamu?

December scores 44 out of 100 on the Watamu Marine Activity Index. That score weights humpback whales, whale sharks, resident dolphins and snorkeling visibility — so a “good” month depends on what you came for. Selective window.

Can you see humpback whales in Watamu in December?

No. Humpbacks are not part of the December pattern in Watamu. They are a mid-year Kusi story, not a Kaskazi one.

Is snorkeling good in Watamu in December?

Typical visibility is about 23 metres. Kaskazi typically flattens the surface and lifts water clarity toward 23 metres — pool-like visibility on settled mornings. This is the window for snorkeling the outer coral gardens and, when certified and conditions allow, diving sites such as Vuma Caves. Morning low-tide slots still give the sharpest views.