Best months to visit
JuneJulyAugust
June through October is the prime window: dry kusi trade winds, cool 25-27 °C, low humidity, reliable sun. December-February also works between the rains with warmer sea. Avoid March-May (long rains) for beach holidays; avoid November-December if heavy rain spoils plans.
Best for
Beach
June to October (dry kusi monsoon, sea 25-27 °C, breezy and reliable) and December-February (warmer sea 28-29 °C between the rains).
Hiking
June to October — Jozani Forest, spice tours and inland walks are comfortable at 25-28 °C with dry trails; the masika makes interior travel difficult March-May.
Sightseeing
June to October and January-February — Stone Town's UNESCO core is hot but bearable in the cool kusi season; avoid the long rains for guided tours.
Climate notes
- Tropical climate (Köppen Aw/Am): warm 25-29 °C year-round with two distinct rainy seasons — long rains (masika) March-May and short rains (vuli) November-December.
- Long rains (masika, March-May): the dominant rainy season — Stone Town averages around 380 mm in April and Nungwi over 450 mm; daily heavy showers and thunderstorms are normal.
- Short rains (vuli, November-December): a milder secondary peak — typically 150-220 mm per month; rain is shorter and more localised than the masika.
- Kusi monsoon (June-October, dry cool season): SE trade winds dominate — comfortable 25-27 °C, lower humidity, the established peak tourism window.
- Kaskazi monsoon (December-February, dry hot season): NE winds, hotter and more humid — 28-30 °C with afternoon sea breezes; second peak tourism window between the rains.
- Sea always warm: surface temperature 26-30 °C every month, with the warmest period February-April and coolest July-September.
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Regional notes
- Stone Town (W coast, capital): UNESCO World Heritage core; sheltered from the SE trades but hotter than the windward coasts; the cultural and historical heart.
- Nungwi and Kendwa (N coast): strong tides barely affect the deep water — swimming and snorkelling are good at any tide; the most developed resort strip.
- Paje, Jambiani and the SE coast: long sandy beaches with very strong tides — the lagoon empties at low tide; world-class kitesurfing June-September thanks to steady kusi winds.
- Jozani Forest (interior): Zanzibar's last primary rainforest — habitat for the endemic red colobus monkey; humid year-round.
- Mnemba Atoll (NE offshore): private-island reef with exceptional snorkelling and diving year-round; turtle and dolphin sightings common.
- Pemba Island (north of Zanzibar): wetter and more rural — better for diving the deeper Pemba Channel.
Frequently asked questions
When is the best time to visit Zanzibar?
June through October — the dry kusi monsoon brings cool 25-27 °C, low humidity, steady SE trade winds and reliable sun. December-February is the second-best window between the two rainy seasons.
When is the rainy season in Zanzibar?
Two seasons. The long rains (masika) run March through May with daily heavy showers — the wettest month is April with 380-460 mm. The short rains (vuli) bring lighter showers in November and December. Outside these, it stays mostly dry.
Should I avoid Zanzibar in April?
April is the wettest month — heavy daily downpours can disrupt boat trips, snorkelling and beach plans, and humidity is high. Many small lodges close for the month. Resorts on Nungwi stay open but expect frequent rain.
Can you swim in Zanzibar year-round?
Yes. Sea temperature stays 26-30 °C every month — the cooler period (July-September) is still warmer than peak Mediterranean summer. Tides on the SE coast (Paje, Jambiani) are very strong; snorkelling is best around high tide.
Is Zanzibar affected by cyclones?
Direct cyclone hits are rare — Zanzibar sits at 6 °S, too close to the equator for most SW Indian Ocean cyclones to reach. The main impact is outer rain bands and swell during the November-April cyclone season; a direct landfall has not been recorded in modern history.
When is kitesurfing best in Zanzibar?
June through September on the SE coast (Paje, Jambiani) — steady kusi trade winds (15-25 knots almost daily), shallow flat lagoons inside the reef, warm sea. December-February has variable kaskazi winds, less reliable for kiting.
How hot does Zanzibar get?
Daytime highs are 28-30 °C in the hot kaskazi season (December-March) and 25-27 °C in the cool kusi season (June-October). Humidity is the bigger factor — coastal trade winds usually keep it bearable, but inland and at night during kaskazi can feel oppressive.
Is Zanzibar good for diving?
Yes — Mnemba Atoll, Leven Bank and the Pemba Channel offer world-class reef and wall diving with sea 26-30 °C year-round. Visibility is best in the dry seasons (June-October and January-February); the long rains stir sediment and reduce clarity.
What should I pack for Zanzibar in July?
Light cotton clothing, sun protection, a thin layer for breezy evenings (it can drop to 22 °C at night), reef-safe sunscreen, mosquito repellent and modest cover-ups for Stone Town (Zanzibar is predominantly Muslim — beach attire stays at the beach).
Climate data: Open-Meteo · 2020–2025