The weather is usually the first thing people ask about. Most travel guides answer it in three words — dry, wet, hot — which is true and almost no help.
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We live in Paje, on the southeast coast, and have done since 2014. The weather here is part of the working day. It decides if the kites fly, if the dhow boats sail, and whether dinner runs under the palms or moves onto the verandah when the sky turns. Below is a month-by-month version of what it actually feels like on the ground, with the numbers to back it up.
!Dhow boat at sunset on Paje Beach Zanzibar The dhow boats still sail with the trade winds — Kaskazi and Kusini.
The two monsoons — the only framework you need
Zanzibar’s year runs on two trade winds: the Kaskazi (northeast monsoon) and the Kusini (southeast monsoon). They’re the same winds the old dhows used to ride into Unguja, and they’re still the easiest way to think about the year.
- Kaskazi blows from late November to mid-March. Warmer air, warmer water, lighter wind, mostly dry — apart from the short rains in November.
- Kusini blows from June to early October. Cooler air, cooler water, strong wind, very dry.
- In between sit two transition seasons — the long rains in April–May (masika) and the short rains in October–November (vuli).
Know which one you’re landing in and you already know most of what you need. The monthly breakdown fills in the rest.
> “The wind is on time. Almost every year, almost every season — within a few days, it arrives when it always arrives. Maybe twelve years here has spoiled us, but you learn to plan around it.” > > — Dim, cofounder Kite Centre Zanzibar & Mr. Kahawa
!Yoga at the beach at Mr Kahawa, Paje Zanzibar Kaskazi mornings are warm, calm, and unhurried.
January — warm, calm, post-festive
January is a big month for Europeans escaping winter. The Kaskazi is settled in. Air sits at 28–32 °C in the day, drops to a soft 24–25 °C at night, and the sea is at 28–29 °C. Rain risk is low.
Wind is light to moderate — 10–15 knots most afternoons. Kitesurfers run bigger kites (10–14 m). For everyone else, the breeze is just enough to keep the heat honest.
Pack: light cottons, swim gear, sun protection, a thin layer for evenings you probably won’t need.
February — the hottest month
February usually wins on heat. Days hit 32 °C, the sea climbs to 29–30 °C, and the air is humid. The Kaskazi keeps blowing, and on the calm days the lagoon at Paje is glass at low tide.
Rain risk is still low. The last week of the month is when you start to feel the long rains gathering somewhere off in the distance.
Pack: same as January. Add more sun cream and a rash vest if you’ll be on the water all day.
March — the transition
The first two weeks of March often feel like extra February. By the third week, the long rains start showing up — usually as big afternoon thunderstorms that clear by sunset. Wind goes wobbly.
If March is your window, lean into the first half.
Pack: as February, plus a light rain shell for late-month travel.
!Atmospheric Zanzibar scene during the rains The long rains bring their own kind of beauty.
April — the wettest month
April is the heart of masika. Honestly the wettest month, and not subtle about it — 300–400 mm of rain, against under 50 mm in July or August. It tends to fall in heavy bursts — one big afternoon downpour, then clear sky — not the all-day drizzle a lot of first-time visitors expect.
Air drops a touch to 27–30 °C. Sea is still 27–28 °C and lovely for swimming. Wind is all over the place.
April suits one kind of traveller — someone who came for a slow week of reading, food, spa, and the odd sunny window between storms. Book it cheap or skip it. Don’t book it as a packed activity week.
Pack: all of the above plus rain shell, quick-dry shoes, small umbrella. The rain is warm; a heavy waterproof is overkill.
May — the rains ease
By mid-May the rain is winding down and the Kusini is filling in. Late May is one of our favourite shoulder windows — lower prices, fewer people, weather improving by the day, wind starting to build.
Air: 27–29 °C. Sea: 26–27 °C. Rain risk: moderate, dropping.
> “When the wind starts pulling from the south again, we know May is closing. The fishermen know it before the calendar does.” > > — A fisherman friend in Paje
Pack: transition kit — rain shell early in the month, light evening layer towards the end.
June — the Kusini arrives
The Kusini settles in for the long stretch. Skies clear, wind blows steady from the southeast, and the morning chill (low 20s °C) actually feels good — a real change from the February heaviness.
Wind: 18–22 knots most days, building through the month.
Pack: light cottons for the day, a thin cardigan or hoodie for evenings — especially on the verandah. Wind layer if you kite.
!Kitesurfer in strong Kusini wind at Paje Beach Zanzibar July and August deliver the strongest wind of the year.
July — the windy peak
July is the windiest, most reliable month of the year. 20–25 knots from morning to late afternoon, often more. Air sits at 23–28 °C — the coolest sustained stretch of the year. Sea drops to 24–25 °C, clearly cooler than the Kaskazi months.
Rain is basically zero in July. Land visibility is excellent — the air is clean and dry. Dive visibility can be lower because the wind chops up the surface.
Pack: a cardigan for evenings — we’re not joking, July can feel chilly after dark. Wind layer for water sport. A shorty wetsuit if you’re kiting all day and feel the cold.
August — like July, sometimes windier
August reads like July with the volume turned up. Peak European summer, so rooms book months ahead. Some afternoons the wind kicks over 30 knots — fun if you’re advanced, brutal if you’re learning.
Pack: as July.
September — softening, still excellent
Wind softens through the month but stays reliable. Air starts to warm up again. Sea creeps up to 25–26 °C. A lot of regulars say September is the best all-round month — quieter than August, still dry, still pretty.
Pack: light cottons, a thin evening layer, sun protection.
October — the other transition
Early October still belongs to the Kusini. By mid-month the vuli (short rains) start gathering. Air warms (26–30 °C); wind direction gets messy.
Pack: as September, plus a light rain shell for mid-to-late October.
November — short rains
The vuli. Showers are short — a 30-minute thunderstorm rather than a grey all-day affair. Rain risk is moderate, but the gaps between showers are often excellent. Rates drop, which makes it a good-value pick if your dates flex.
Air: 27–30 °C. Sea: 27–28 °C.
Pack: light cottons, rain shell, swim gear.
December — the Kaskazi returns
By mid-December the short rains have usually moved on and the Kaskazi is back. Christmas and New Year is one of the two big peak weeks of the year — book by August if you want choice.
Air: 28–31 °C. Sea: 27–28 °C.
Pack: as January.
!Zanzibar sunset over Paje Beach Sunset light through the dust of the dry season.
A quick reference table
| Month | Air (°C) | Sea (°C) | Rain risk | Wind | Best for |
|---|---|---|---|---|---|
| Jan | 28–32 | 28–29 | Very low | Light | Beach, families |
| Feb | 28–32 | 29–30 | Low | Light | Honeymoon, diving |
| Mar | 28–31 | 28–29 | Rising | Light | Early-month travel |
| Apr | 27–30 | 27–28 | High | Variable | Slow tourism, value |
| May | 27–29 | 26–27 | Moderate | Building | Shoulder value |
| Jun | 24–28 | 25–26 | Low | Strong | Kite, dive |
| Jul | 23–28 | 24–25 | Very low | Very strong | Kitesurfing peak |
| Aug | 23–28 | 24–25 | Very low | Very strong | Kitesurfing peak |
| Sep | 24–28 | 25–26 | Low | Strong | All-round |
| Oct | 26–30 | 26–27 | Rising mid | Variable | Early-month kite |
| Nov | 27–30 | 27–28 | Moderate | Variable | Value, slow trips |
| Dec | 28–31 | 27–28 | Declining | Light | Festive travel |
Humidity and the heat index
Humidity matters about as much as the raw temperature out here. Zanzibar sits at 70–85% all year, higher during the Kaskazi (December–March) and noticeably lower during the Kusini (June–September). That’s why February at 30 °C with 80% humidity feels heavier than July at 28 °C with 65%.
The trade winds save you. As long as you stay in the breeze, even the hottest weeks are fine.
Sea temperature — the headline numbers
For comparison — the Mediterranean in summer tops out around 26 °C. Zanzibar water sits between 24 and 30 °C all year. Even in the coolest month (July–August), it’s warmer than most northern European summer seas.
For diving, the Kusini chill makes a 3 mm shorty wetsuit nice on a long boat day. For everyone else, it’s bath-warm all year.
What to pack — the short version
Always: light cottons, swim gear, sun hat, reef-safe sunscreen (Zanzibar’s coral does better without oxybenzone), refillable water bottle, a modest cover-up for villages and Stone Town.
Kaskazi months (Dec–Mar): lighter fabrics, a light scarf for breeze, sandals.
Kusini months (Jun–Sep): light cardigan or hoodie for evenings, wind layer for water sport.
Rainy months (Apr–May, Oct–Nov): light rain shell, quick-dry shoes, a small travel umbrella.
Pick your month, we’ll sort the rest
Use this as a starting point — then drop us a line and we’ll match your dates to what you came for. We’ve hosted guests through every month of the year. We know what works.
Common questions
What is the wettest month in Zanzibar?
April. The middle of masika. Rainfall averages 300–400 mm. Not subtle.
What is the driest month in Zanzibar?
July. Often under 30 mm across the entire month, with most days completely dry.
How hot does Zanzibar get?
Daytime maximums rarely top 32 °C anywhere on the island. Warm but not extreme, plus constant trade winds and a warm sea — most people find it comfortable year-round.
Is it true that Zanzibar has two rainy seasons?
Yep. The long rains (masika) in April–May, and the short rains (vuli) in October–November. The long rains hit harder; the short rains are usually quick afternoon showers.
When is the sea warmest in Zanzibar?
February. Sea temperature peaks at 29–30 °C — warmer than any northern hemisphere summer sea.
Does it rain every day in April?
No — but it rains most days. The usual pattern is a long sunny morning, an afternoon storm of 30–90 minutes, then clear sky for sunset. Some days are grey with light drizzle. Genuine all-day rain is rare.
Is the weather very different on the east versus west coast?
A bit. Stone Town on the west is more sheltered from the Kusini, slightly hotter, and gets less of the southeast wind. Paje and Bwejuu on the southeast get the full trade winds — which is why the kite scene is here. Rainfall and seasonal patterns are roughly the same across the island.
Are there cyclones in Zanzibar?
Nope, not really. Severe tropical cyclones rarely make direct landfall on Unguja — the island sits just outside the main cyclone belt of the southwest Indian Ocean. Heavy weather still happens, but the risk to a planned trip is low.
Is the weather in Zanzibar different from mainland Tanzania?
A bit. Coastal Tanzania (Dar es Salaam, Bagamoyo, Pangani) follows the same monsoon pattern as Zanzibar — Kaskazi, Kusini, long and short rains. Inland Tanzania (Arusha, the safari belt) is a different story — cooler, higher altitude, rains driven by the East African system rather than coastal trade winds. If you’re combining a beach week here with a safari, expect different weather at the two stops and pack a warm layer for safari evenings.
—
The weather here is steady enough to plan around, and just variable enough that no two trips feel quite the same. There’s a phrase we use at Mr. Kahawa — “When you like, you stay. When you love, you return.” The month you pick is where that starts. Whenever you’re ready, we’ll sort the rest.
Karibu sana — you are most welcome.
— The Mr. Kahawa team