Timing your trip
best time to visit lamu archipelago
Two monsoons set the rhythm on the Lamu coast: the calm, clear Kaskazi from the northeast and the brisk, choppy Kusi from the southwest. When you come decides whether the water is glass or swell.
seasonal guide to lamu archipelago
For calm seas and clear water, come during the northeast Kaskazi monsoon from December to February, when underwater visibility is at its best and the days are hot and dry. October is a quiet interlude with the clearest water of the year and fewer guests. Avoid April and May, when heavy rain and rough seas cloud the water. The Kusi months from June to September suit sailing more than snorkelling.
month by month details
January sits at the heart of the Kaskazi northeast monsoon, with calm seas and the clearest water of the year. Light northeasterly winds cool the afternoons without stirring the surface, and underwater visibility is excellent for diving and snorkelling.
This is the driest stretch on the coast, around six days of rain across the month, with hot, bright days and warm nights tempered by the sea breeze. Sea temperatures sit near 27 to 30 degrees. It is also peak whale shark season off the Kenya coast, with the best sightings running January to March, alongside good chances of dolphins over the reefs.
February is the driest month of the year and among the best for time in and on the water. The Kaskazi continues with light to moderate winds, the seas stay calm, and visibility is at its annual peak for snorkelling and diving.
Expect only a handful of rainy days, long hours of sun, and warm water near 27 to 30 degrees. Days are hot and humid but the breeze keeps things comfortable. Whale shark sightings remain strong, dolphin encounters are common, and the reef life shows at its clearest. This is high season, so lodges fill early.
March opens with calm, clear Kaskazi conditions but slides toward the long rains by month's end. Early March still counts within the prime window, with good visibility and warm, settled seas; the second half turns hotter, more humid and less predictable as showers build.
It is one of the hottest months, with sea temperatures climbing to 30 degrees and a sultry feel to the air. The whale shark season extends into March, and the warm, nutrient-rich water holds good pelagic life. Come in the first half if you want strong sea conditions before the wet season sets in.
April brings the peak of the long rains, the point at which beach and diving conditions break down. The Kaskazi fades, squalls move in, the sea turns choppier, and runoff cuts underwater visibility well below its dry-season standard.
This is one of the wettest months on the coast, around fifteen days of rain, very hot and very humid. The reef and pelagic life are still present, but murky water makes viewing far less rewarding, and many dive operators switch to training rather than open-water trips. For a sea-focused trip, April is best avoided.
May is the wettest month of the year, with the Kusi southwest monsoon now established and the sea at its roughest. Stronger southeasterly winds bring swell and chop, sustained long rains keep visibility poor, and some lodges close for the season.
Around twenty days of rain fall on average, with persistent cloud and a hot, humid feel. The marine life is unchanged; it is the conditions, not the fish, that limit the experience. Snorkelling and relaxed swimming are difficult, and this is the quietest, least rewarding month for a Lamu holiday built around the water.
June marks the turn as the long rains ease, usually clearing by mid-month, though the Kusi keeps the sea unsettled. Conditions improve on April and May, but wind and residual swell still leave the water below its calm-season best for snorkelling.
Rainfall drops steadily through the month and the islands turn green, with cooler, more comfortable air and sea temperatures around 25 to 29 degrees. The brisk southeasterly suits sailing more than relaxed reef time. A reasonable choice if you want fewer guests and don't mind a variable sea, but not a prime diving month.
July sits in the long dry season, with sunny days and low humidity but a steady Kusi wind keeping the sea choppy. The weather is at its most comfortable, yet the southeasterly swell makes for moderately rough water, better for sailing and boardsports than for calm snorkelling.
Rain is light and brief, and the air feels mild and fresh, with sea temperatures cooling to around 24 to 27 degrees. Visibility is workable on sheltered leeward reefs but not at its dry-season peak. A strong general beach month for anyone wanting cooler, drier weather, with sea conditions a clear step below the calm Kaskazi months.
August stays dry and breezy under the Kusi, with the coolest sea temperatures of the year and a wind that keeps the surface lively. There are calmer spells, but in general the water is choppier and visibility sits below the standard of the Kaskazi season.
The air is warm and comfortable, the sea near 23 to 27 degrees, and rain stays scattered rather than heavy. It is a good month for beach time, dhow sailing and cultural days in Lamu Old Town. For snorkelling and diving, expect a mixed picture: fine on sheltered sides, but not the clear, calm conditions of high season.
September is a solid shoulder month as the Kusi begins to ease and the sea starts to settle, especially later on. There is still more movement than in the Kaskazi season, but visibility can be fair to good in calmer spells, and conditions improve as the month goes on.
The weather stays dry and warm with moderate humidity, and the sea sits around 23 to 27 degrees. Crowds are thin and prices softer than high season. Sea activities are workable rather than at their best, making September a good fit for travellers who value quiet and a comfortable climate over peak underwater clarity.
October is the calm interlude as the Kusi winds drop away, often producing the clearest water of the year. Light, variable breezes return, mornings turn calm, and early to mid-October frequently delivers excellent visibility for diving and snorkelling, with far fewer guests than the festive months.
The short rains tend to arrive in the last days of the month, so showers build toward the end, but the bulk of October stays bright and settled, with sea temperatures around 24 to 28 degrees. It marks the approach of the main whale shark window, and the reefs show beautifully in the clearing water. One of the best months to visit, particularly its first half.
November brings the short rains alongside the returning Kaskazi, so the sea calms and clears even as showers come and go. Winds are light and the water settles enough for good snorkelling again, but the rain is unpredictable, arriving as short, sharp bursts rather than steady downpours.
Around ten days of rain fall on average, with plenty of sun between them, hot humid days and warm nights. The whale shark season opens, dolphins and pelagics are active, and the reefs sit in good visibility. A rewarding month for water sports and local culture, with the Lamu cultural festival often falling here, provided you accept the chance of showers.
December sees the Kaskazi fully re-establish, bringing warm, calm seas and the return of reliably clear water. Gentle northeasterly winds, fine visibility and settled conditions make it excellent for snorkelling, diving, sailing and relaxed swimming.
The short rains usually end early in the month, ushering in the short dry season, with around nine days of rain, mostly brief showers, and sea temperatures near 28 degrees. The whale shark window is open, dolphin encounters are good in the clear water, and the reefs are lively. This is peak festive season, so demand and prices are high and lodges book out well ahead.
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frequently asked questions
October to March, with the Kaskazi behind it.
The north-east monsoon brings warm, still days and the clearest water of the year, which is when the dhow sailing, the sandbank picnics and the snorkelling are at their best. October and November are lovely, and January and February the classic weeks.
Whale sharks pass through in the early months, which is a genuine reason to time a trip.
If the water is the point of your visit, those are the months to book.
June to September is the Kusi, and it changes the place.
The south-east monsoon brings cooler air, steady wind and choppier water, so the snorkelling is poorer and the dhow days are brisk rather than lazy. It is excellent for sailing and for anyone who finds the heat hard work.
The town, the food and the walking are unaffected.
We would still send a sailor in July. For a snorkelling trip we would move you to October.
Yes, if you have a choice.
They bring the heaviest rain and the roughest water of the year, and a beach-and-boat stay depends on both. Some houses and hotels close.
March is the hinge, often still calm early in the month.
If your dates are fixed, we will book a house with good shade and a pool and tell you to expect the sea to be brown rather than blue.
Christmas, New Year and the Maulidi festival.
The houses in Shela fill first for the holidays and the good ones go a year ahead. Maulidi, which follows the Islamic calendar and moves each year, fills the town with pilgrims and is extraordinary to witness but not a quiet week.
September, October and early December are the calm, warm alternatives.
Tell us your dates and we will say what the island will feel like, and whether a festival falls in them.
The calm months, from about October to March.
That is when the sea is flat enough for the boats to go out reliably and the visibility for anything on the reef is at its best. The same window carries the whale sharks.
During the Kusi, from June to September, the wind keeps the smaller boats closer to home.
If fishing or diving is the reason for the trip, tell us and we will time the dates rather than fit them round the flights.
At the end, and the flights make it simple.
Scheduled aircraft connect the Maasai Mara and the northern Kenya strips to Manda without a night in Nairobi, so a safari can finish on the water the same afternoon.
The seasons line up too: July to October and January to February are strong for both the bush and the coast, though Lamu's water is calmer in the latter.
Four nights is the usual allocation, and a week if you have taken a house.
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Whether by phone or in person, we work with you directly to shape a journey that is both thoughtfully considered and expertly delivered.
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