Zanzibar has four seasons—two dry and two rainy. Air temperatures rarely fall below 26°C (79°F), while the ocean stays above 25°C (77°F). On paper, that might make the seasons seem interchangeable. In reality, there is a world of difference between the calm seas of February and the winds of July, between a March downpour and September sunshine.

Zanzibar is an archipelago off the coast of Tanzania, just six degrees south of the equator. Its equatorial location means consistently warm weather and tropical seas, but the monsoons reshape conditions every few months. The wind determines when and where it rains, which beaches have calm water and which are rough, and even which side of the island is best to stay on.

Four Seasons—and They're All Different

The Zanzibar year is not simply two seasons—dry and rainy—as it is often described. It has four distinct seasons that follow one another in a fairly regular cycle.

Long Dry Season: June–October

This is Zanzibar's "winter" and its coolest period, with daytime temperatures around 26–30°C (79–86°F) and sea temperatures of 25–27°C (77–81°F). Rain is rare—typically just two or three rainy days a month—and the skies are generally clear. The trade-off is the kusi, the southeast monsoon, which creates waves along the island's eastern coast. That's no problem if you're there to lie on the beach, but for swimming, your choice of coastline matters.

Short Rainy Season: November–December

This is a transitional period. The kusi weakens and the rains arrive, usually as short showers lasting 30–60 minutes. Humidity rises, while temperatures climb to 30–33°C (86–91°F). The ocean becomes calmer. November is the least predictable month: you might get drenched, or you might get an entire week of sunshine.

Short Dry Season: January–February

Hot and dry, with temperatures around 32–35°C (90–95°F) and sea temperatures of 28–30°C (82–86°F). February is the driest month in Zanzibar, with only one or two rainy days and around 42 millimeters of precipitation. The ocean is often glassy calm, underwater visibility is at its best, and this is firmly part of the high season.

Long Rainy Season: March–May

This is the main low season. The northeast monsoon brings prolonged heavy rains, with April typically the wettest month: 20–25 rainy days out of 30, overcast skies, and oppressive humidity. In particularly wet years, some hotels and tourist facilities may temporarily close. Prices can fall by 50–70%, but so can the number of things you can reliably do.

When Is the Ocean Calmest?

The answer depends largely on which coast you stay on. Zanzibar is an island, and the same wind that creates waves on one side can leave another beach almost perfectly calm.

January and February are generally the calmest months across the island. The monsoon weakens, winds are light, and the ocean can be as smooth as a lake. Conditions are ideal for snorkeling and diving, with underwater visibility reaching up to 30 meters (100 feet). These months can also bring dolphins, turtles, and larger pelagic fish closer to the reefs.

June–October is dry and sunny but considerably windier. The kusi creates waves along the southeastern coast, particularly around Paje and Jambiani, making the area a paradise for kitesurfers. If your priority is calm swimming water, head instead to the northern and northwestern beaches such as Nungwi and Kendwa, where the island itself provides shelter from the prevailing winds.

November and December bring lighter winds and calmer seas, although rain can reduce water clarity close to shore. If the weather cooperates, swimming conditions can be excellent on virtually any coast.

March–May brings warm seas—around 28–29°C (82–84°F)—but heavy rain can make the water cloudier, currents can strengthen, and snorkeling visibility is generally poor.

Tides: The Thing Nobody Warns You About

Zanzibar has some of the most dramatic tides in the Indian Ocean. The difference between high and low tide can reach 3–4 meters (10–13 feet), and along the eastern coast the sea can retreat hundreds of meters from the shoreline.

In the morning, turquoise water may lap right at the edge of the beach. Six hours later, there can be a kilometer of exposed sand between you and the nearest pool deep enough to stand in. 

Swimming at low tide is often impossible: you have to walk across the exposed seabed, navigating sea urchins and coral, and even when you finally reach the water, it may be only knee-deep.

Tides are not seasonal—they follow a roughly 12-hour cycle. What changes is how much they affect your holiday, depending on the beach. On the eastern coast, around Paje, Jambiani, and Matemwe, the tides are dramatic: the water retreats a long way and stays out for hours.

On the northern coast, around Nungwi and Kendwa, the effect is much less pronounced, thanks to the shape of the seabed, and swimming is possible at almost any time of day.

For families with children and anyone who wants to be able to swim whenever they please, Nungwi and Kendwa are the safer choices. For those who love long walks across exposed seabed, the eastern coast is spectacular—but you need to accept that for part of the day, the ocean will be far away.

Which Coast Should You Choose?

  • Nungwi — north

One of the best beaches for swimming, with minimal tidal variation, turquoise water, and a gently sloping seabed. There's plenty of infrastructure, from restaurants and bars to hotels across a wide range of budgets. The island's famous sunsets are also on this side, and they are spectacular. The downside is that Nungwi can get crowded during the high season.

  • Kendwa — northwest

Close to Nungwi but quieter. Tides are also relatively weak here, and the beach is broad, with white sand and several high-quality hotels. It's a good choice for anyone who wants Nungwi without the crowds.

  • Paje — east

Zanzibar's kitesurfing capital. From June through October, the kusi creates consistent winds and waves, attracting kitesurfers from around the world. For conventional swimming, however, conditions can be challenging because of the strong tides, waves, and seaweed. The upside is a youthful, energetic atmosphere.

  • Jambiani — southeast

A long, relatively empty beach with a village atmosphere and far fewer tourists. Tides are pronounced and the wind can be strong. It's ideal for solitude, but swimming is best timed for high tide.

  • Stone Town — west

The historic capital, with narrow streets, Arab architecture, and spice markets. There are no real swimming beaches in the city, but Stone Town is worth at least a day of exploration. Its historic center is a UNESCO World Heritage Site.

The Best Months—with the Fewest Compromises

  • February: The driest month, with calm seas and maximum underwater visibility. It is hot—32–35°C (90–95°F)—but the dry heat is generally easier to tolerate than the humid conditions of the rainy season. For diving and snorkeling, this is arguably the best month of the year.

  • July–September: Dry, sunny, and slightly cooler, at around 26–30°C (79–86°F). The eastern coast is windy, while the north is relatively sheltered. Prices are moderate and visitor numbers are lower than in winter. For anyone who dislikes extreme heat, these months can be more comfortable than February.

  • January: Dry and hot, with calm seas. It's high season, so prices are at their peak, particularly around the New Year holidays.

  • June and October: Transitional months. June marks the beginning of the dry season, although some rain is still possible; October marks its end, with showers beginning to return. Both are solid options if you want lower prices and fewer tourists.

When Should You Definitely Avoid Zanzibar?

April and May are the months to think twice about. Heavy rain can occur on around 20 days a month, humidity can reach 85%, and skies may remain overcast. The ocean becomes murkier, excursions can be canceled, and some tourist businesses close temporarily. Discounts can reach 70%, but even at a third of the usual price, this is not the Zanzibar most people fly eight or nine hours to experience.

November is a gamble. It can be sunny and beautiful, or wet and stormy. For adventurous travelers, that's acceptable. For anyone looking for predictable beach weather, it's a risk.

Getting There—and What to Know Before You Go

Direct flights from Moscow take around 8–9 hours, with several airlines offering service, including charter flights. With a connection in Istanbul, Doha, or Dubai, the journey takes 12 hours or more. A Tanzanian visa can be obtained on arrival for $50 or applied for online in advance.

The time difference with Moscow is zero hours in winter and one hour behind in summer, making jet lag relatively mild—a useful advantage over destinations such as Thailand or Bali, where the time difference can eat up the first couple of days of a trip.

The local currency is the Tanzanian shilling, although US dollars are widely accepted. Bargaining is part of the culture in many tourist settings, and an initial asking price can be significantly higher than what you may ultimately pay.

And one final point: Zanzibar is not the Maldives. It is less polished, more chaotic, and more authentic. Stone Town smells of spices and fish, some roads are unpaved, and power cuts can happen. But the white sand, turquoise water, and sunsets over Nungwi are world-class. You just need to pair them with the right month—and the right coast.