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"Rainy season" is one phrase doing two jobs on Zanzibar, and most of the disappointment comes from treating them as the same thing. Our best time to visit Zanzibar guide gives the calendar; this page answers the question underneath it — what rain actually looks like on the island, what closes, what the sea does, and whether a wet-season visit is a good decision or a false economy.
The detail
What the rain looks like. In November the pattern is tropical and short: a build-up of cloud, a hard shower, then sun on wet sand within the hour. Days are rarely lost. The long rains are a different animal. From late March the showers lengthen; by April — the wettest month of the year, averaging around 400 mm of rain at Zanzibar City — downpours can run through the day, daytime highs sit around 30°C, the humidity is very high and the sky can stay grey for stretches. May eases, and by June the dry south-east wind has usually cleared it. Rain is not constant even in April, but a washed-out day is a real possibility.
What closes. Many beach lodges and resorts close for some or all of April and May, using the gap for renovation. Closure windows are not uniform: some properties shut for May alone, others for all of April and May, and a few from late March. Rainbow Tours says most beach lodges are closed for these months and reopen in June, and Expert Africa notes that a handful of hotels stay open in May. The practical consequence is that the choice narrows just when the rates fall — so a wet-season stay is designed around what is open, not around a wishlist. Closures shift from year to year, so each property's dates are checked when you enquire.
Rates. The long rains are usually the lowest-rate window at properties that stay open, and November sits in the quieter shoulder. Some specialists treat January and February as low season too, so check each property. A green-season stay can be better value, but the saving buys a different holiday, not the same one with a smaller bill. If you are pairing the island with a mainland safari, check each camp's open dates as well as the island's.
Seaweed. Seaweed on the sand varies with the tide and the wind rather than following a clean season; how the tides work explains why the same beach can look different from one week to the next. Read it as part of the place rather than a fault in it.
The wind. The long rains fall in the change-over between the island's two trade winds, and the cooler south-east kusi usually takes over as they clear. Which wind favours which coast, month by month, is set out in our Zanzibar activity calendar.
Month by month, November to June. October and January to February are covered in our best time to visit Zanzibar guide.
| Month | Rain pattern | What is open | Rate position |
|---|---|---|---|
| November | Short rains: showers between sunny spells | Open | Quieter shoulder |
| December | Short rains easing early in the month | Open | Shoulder |
| March | Long rains begin, usually late in the month | Mostly open; a few close late in the month | Falling |
| April | Wettest month; heavy, sometimes all-day rain | Many beach lodges closed; a handful of hotels open | Lowest at open properties |
| May | Wet, easing towards the end | Many beach lodges closed; some close in May only | Low |
| June | Drying out as the kusi arrives | Reopening | Rising |
What still works in the wet. Stone Town, where the alleys are sheltered and the light after a storm is extraordinary. Spice farms and Jozani Forest. Swahili cooking afternoons. And the moment the clouds part, the beach — emptier than you will ever see it in August.
Key facts
Long rains: March–May; April wettest, heavy and sometimes all-day. Short rains: around November, lighter and sporadic, often into early December. Wettest month: April. Hotel closures: many beach lodges close for some or all of April–May, some for May only; a handful of hotels stay open in May. Lowest rates: usually April–May at open properties (market pattern). Seaweed: varies with tide and wind. Still good in the wet: Stone Town, spice farms, Jozani.
Planning it with Nobu
A travel designer can say when a date is a poor fit for the island, and can design around the rain when the dates cannot move: a Stone Town-weighted stay, a north-coast beach rather than an east-coast lagoon, or a property open for your dates. The green season is a tool a travel designer works with, not a risk to hide.
Is it right for you?
November and early December are right for you if you want a quieter island, warm sea and are relaxed about a shower a day. The long rains are right for you if your dates are fixed, if Stone Town and culture matter more than sun-lounger hours, if you are pairing the island with a green-season safari and want the rates to match, or if you simply like the drama of tropical weather. They are not right if this is the one beach week of your year, if you are travelling with small children who need the pool and the sand every day, or if your heart is set on a particular east-coast resort — check that it is open before you fall for it.
Journeys to consider
- Shores of Zanzibar — Stone Town, spice and the coast; the shape that holds up best in the green months. → Shores of Zanzibar
- Southern Safari & Spice — Tanzania's south and the island; in the green months, designed around which camps and lodges are open on both halves. → Southern Safari & Spice
