People ask me when the best time to go to Zanzibar is almost every week, and the honest answer depends on what you actually want out of the trip. Here is the real answer, broken down month by month, no guesswork.
What Is Zanzibar?
Zanzibar is an archipelago in the Indian Ocean, sitting off the coast of Tanzania in East Africa. It is made up of two main islands, Unguja, the one most people mean when they say “Zanzibar,” and Pemba to the north, plus a scatter of smaller islets around them. Known for Stone Town‘s old trading streets, spice farms, and white sand beaches, it is one of the most popular add-ons to a Tanzania safari.
The Short Answer
June to October is the best time of year to go to Zanzibar. This is the dry season. Days are sunny, humidity drops, and rain is rare. It also lines up with safari high season on the mainland, so it is the easiest window to combine a Zanzibar beach trip with the Serengeti migration.
March to May is the one stretch to avoid if good weather is your priority. This is the long rains, and it is genuinely wet.
Zanzibar Temperature and Rainfall by Month
| Month | Avg Temp | Avg Rainfall |
|---|---|---|
| January | 33°C (91°F) | 66mm |
| February | 34°C (93°F) | 69mm |
| March | 34°C (93°F) | 172mm |
| April | 32°C (90°F) | 385mm |
| May | 31°C (88°F) | 293mm |
| June | 30°C (86°F) | 82mm |
| July | 29°C (84°F) | 61mm |
| August | 30°C (86°F) | 42mm |
| September | 31°C (88°F) | 42mm |
| October | 32°C (90°F) | 72mm |
| November | 33°C (91°F) | 136mm |
| December | 33°C (91°F) | 128mm |
Look at April specifically. Nearly 400mm of rain in one month, more than five times what falls in August. That single number tells you almost everything you need to know about picking your dates.
Visiting Zanzibar Between January and March
January
Hot, sunny, and humid, with rain staying fairly light at 66mm. This is also one of the strongest months for diving, since the water runs clear.
February
The hottest month of the year on paper, averaging 34°C, and still dry enough for excellent diving conditions, especially along the south coast.
March
Temperatures stay high, but rainfall jumps to 172mm as the long rains start building. Early March can still be a good window. Late March starts turning wet.
Visiting Zanzibar During April and May
April
The wettest month of the year by far, averaging 385mm of rain. Heavy afternoon downpours are the norm, and several lodges close entirely for the season.
May
Still deep in the long rains, though rainfall eases slightly to 293mm. Humidity stays high. This remains part of the low season.
Visiting Zanzibar From June to July
June
The dry season begins. Rainfall drops sharply to 82mm, and temperatures ease to a more comfortable 30°C. This is also when safari high season starts on the mainland.
July
One of the coolest, driest months of the year, averaging 29°C with just 61mm of rain. Clear skies and comfortable heat make this one of the best all-around months to visit.
Travelling to Zanzibar from August to October
August
Rainfall drops to its lowest point of the year at 42mm, and the weather stays mild, not too hot, not too humid. Soothing breezes start arriving from the south.
September
Rain stays just as low as August, and this month adds turtle hatching season in the Mafia Archipelago along with strong diving. Some offshore dive sites do get rougher this month, so plan dives carefully.
October
Cool winds, calm seas, and clear skies. Ocean temperatures start rising, and evenings warm up gradually as the short rains of November approach.
Visiting Zanzibar During November and December
November
The short rains begin. Rainfall jumps to 136mm, but showers tend to be short and fall mostly in the afternoon, clouds build in the morning, then break for an hour or two before clearing again.
December
Slightly drier than November at 128mm, and one of the best months of the year for diving with whale sharks in the Mafia Archipelago. There is also a better chance of sunshine heading into Christmas and New Year.
Things to Do in Zanzibar and What They Cost
| Activity | What It Is | Typical Cost (per person) |
|---|---|---|
| Stone Town walking tour | Guided walk through the old trading town, its markets, and historic buildings | $20 to $30 |
| Spice farm tour | Half-day visit to a working farm growing cloves, nutmeg, and cinnamon | $15 to $25 |
| Prison Island tour | Boat trip to Changuu Island to see giant tortoises and old ruins | $25 to $40 |
| Snorkeling at Mnemba Atoll | Boat trip to one of the best reef sites near Zanzibar | $50 to $80 |
| Scuba diving, single dive | Guided reef dive for certified divers | $60 to $90 |
| Sunset dhow cruise | Traditional sailboat trip along the coast at sunset | $40 to $60 |
| Swimming with dolphins, Kizimkazi | Boat excursion to see and swim with wild dolphins | $40 to $60 |
| Jozani Forest tour | Guided walk to see the red colobus monkey, found only in Zanzibar | $15 to $20 |
| Whale shark swim, Mafia Archipelago | Boat excursion to swim near whale sharks, best November to February | $100 to $150 |
| Nakupenda sandbank trip | Boat day trip to a sandbank for swimming and a seafood lunch | $50 to $70 |
TourwithPipi Tanzania and Zanzibar Packages
These are real Tanzania and Zanzibar itineraries we run, priced per person.
| Trip | Duration | From (per person) | Covers |
|---|---|---|---|
| Zanzibar Unveiled: A Luxury Coastal Retreat | 4 Days | $1,199 | A standalone Zanzibar escape, beaches, guided cultural and natural sites |
| 7-Day Classic Luxury Tanzania Safari | 7 Days | $3,109 | Serengeti, Tarangire, Ngorongoro Crater |
| 9-Day Tanzania and Zanzibar Safari | 9 Days | $4,869 | Tarangire, Ngorongoro Crater, Central Serengeti, Zanzibar |
| 10-Day Luxury Tanzania Calving Season Safari | 10 Days | $4,839 | Tarangire, Ngorongoro Crater, Ndutu Plains, Central Serengeti |
| 10-Day Luxury Tanzania Great Migration Safari | 10 Days | $5,479 | Tarangire, Ngorongoro Crater, Northern Serengeti |
The 4-day Zanzibar trip works well on its own or tacked onto any of the Tanzania mainland safaris above.
Best Time for Diving in Zanzibar
- January to March: some of the clearest water of the year, especially along the south coast
- September: turtle hatching and strong diving in the Mafia Archipelago, though plan carefully since some offshore sites get rough
- December: whale shark season in the Mafia Archipelago
Best Time to Swim With Dolphins
June to September, plus January and February, are the strongest months for dolphin encounters. Mnemba Island on the northeast tip and Kizimkazi on the southwest coast are the two best-known spots. Always book through a reputable, ethical operator.
Best Time to Combine Zanzibar With the Wildebeest Migration
June to October works perfectly, since it is dry season on both the mainland and the islands. Flights connect the Serengeti and Zanzibar daily, usually leaving before noon and landing on the island well before dark.
Ready to Plan Your Tanzania and Zanzibar Trip?
If you want help picking the right dates for a Zanzibar beach extension or a full Tanzania and Zanzibar combination, message me directly on WhatsApp.
Frequently Asked Questions
When is the best time to go to Zanzibar?
June to October, the long dry season. Rain is rare, skies stay clear, and it is the easiest window to combine with a mainland Tanzania safari.
What is the best time of year to visit Zanzibar for diving?
January to March offers some of the clearest water of the year, and December is prime time for diving with whale sharks in the Mafia Archipelago.
When should I avoid visiting Zanzibar?
April and May, the long rains. Rainfall in April alone can top 380mm, and several lodges close for the season.
Can I combine Zanzibar with the wildebeest migration?
Yes, easily. June to October is dry season on both the mainland and the islands, and daily flights connect the Serengeti to Zanzibar in a few hours.
When is the cheapest time to visit Zanzibar?
March to May. Resort rates drop the most in April and May specifically, though the tradeoff is heavy rain and some lodges closing entirely.
Is Zanzibar good to visit in December?
Yes. December is drier than November, the short rains are light, and it is one of the best months for diving with whale sharks in the Mafia Archipelago.
Blog Summary About the Best Time to Visit Zanzibar
- June to October is the best time of year to visit Zanzibar, the long dry season.
- April is the wettest month, with rainfall around 385mm on average.
- March to May is the long rains and the cheapest time to book.
- January to March offers some of the clearest diving conditions of the year.
- December is prime whale shark season in the Mafia Archipelago.
- September brings turtle hatching but rougher water at some offshore dive sites.
- Dolphin encounters are strongest June to September, plus January and February.
- November and December bring light, short afternoon showers, the short rains.
- Flights connect the Serengeti to Zanzibar daily, making a migration and beach combo easy.
- July and August are the coolest, driest months of the whole year.
