Zanzibar weather in September
Zanzibar averages 29°C by day and 23°C at night in September, with the sea at 27°C and 18 days with at least 1 mm of rain.
Day
29°C
Night
23°C
Sea
27°C
Rainy days
18
Flight from London
9h
What September feels like
September is hot but wet in Zanzibar: rainy season, so pack for showers.
The sea is warm at 27°C: comfortable for long swims.
It is rainy season, with rain on about 18 days.
Of the 48 sun destinations we track, Zanzibar is the #25 warmest in September.
Want it warmer in September?
These are hotter than Zanzibar this month for at most an hour and a half more flying:
Zanzibar weather by month
September is highlighted. Compare with August and October, or see the full year in Zanzibar.
Zanzibar in September: quick answers
Is Zanzibar hot in September?
September is hot but wet in Zanzibar: rainy season, so pack for showers. Average highs are 29°C and lows 23°C.
Can you swim in Zanzibar in September?
The sea is warm at 27°C: comfortable for long swims.
Does it rain in Zanzibar in September?
It is rainy season, with rain on about 18 days.
What is the warmest month in Zanzibar?
February, at an average high of 32°C. The coolest is July at 27°C.
How long is the flight to Zanzibar from the UK?
About 9h direct from London, estimated from the 7,435 km distance. Check your airline for exact times.
Still choosing? See where is hot in September for every destination ranked by temperature, sea and flight time.
How we measured this
Averages of every day in September from 2016 to 2025, from the Open-Meteo historical weather archive (ECMWF ERA5 reanalysis). Sea temperature is the 2023 to 2025 average from the Open-Meteo marine archive. A rainy day has at least 1 mm of rain. Reanalysis describes an area about 25 km across, so sheltered resorts can run a degree or two warmer. Flight time is a distance-based estimate from London Heathrow.
Planning Zanzibar in September?
Save the restaurants, beaches and views you find on TikTok and Instagram for Zanzibar straight to a map, then let Dream Trip turn them into a day-by-day plan.
