Weather in Zanzibar in September 2025
- September is usually the driest month of the year in Zanzibar
Average weather
Average temperature in Zanzibar in September
The temperature in September is +28°C on average, with a range between a maximum of +29°C during the day and a minimum of +24°C at night.
The average maximum temperature goes up 20% by the end of the month, compared with the beginning of the month, from +27°C to +28°C.
Is Zanzibar warm or cold in September?
Zanzibar is typically warm in September.
Maximum temperatures go up compared to the previous month from +27°C to +27°C. The minimum temperature also goes up from +23°C to +23°C.
It’s generally warm, but pack a long-sleeve shirt for evenings.
Take a look at how September is compared to other months in Zanzibar:
Water temperature in Zanzibar in September
Water in Zanzibar in September is Warm. It varies from +25°C to +27°C, with an average of +26°C. This is almost similar to the air temperature, which averages +27°C.
The water temperature in September is one of the coldest of the entire year:
Can you swim in Zanzibar in September?
Climate in Zanzibar in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +27°C | +27°C | +28°C | ||||
| Min. temperature | ||||||
| +22°C | +22°C | +22°C | ||||
| Max. temperature | ||||||
| +29°C | +29°C | +31°C | ||||
| Rainfall | ||||||
| 32 mm | 27 mm | 59 mm | ||||
| Wind | ||||||
| 3 m/s | 3 m/s | 2 m/s | ||||
| Avg. water temperature | ||||||
| +26°C | +26°C | +27°C | ||||
| Humidity | ||||||
| 78% | 77% | 79% | ||||
| Air pressure | ||||||
| 1016 HPa | 1014 HPa | 1013 HPa | ||||
| Sunny days | ||||||
| 2 | 3 | 3 | ||||
| Cloudy days | ||||||
| 5 | 3 | 4 | ||||
| Rainy days | ||||||
| 24 | 24 | 24 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as good as in August. The temperature levels stay the same in the area of +27°C for average maximum temperature during the day. As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 32 mm to 27 mm. It feels drier, as humidity decreases from 78% to 77%. The average wind speed doesn’t change much during September, staying around 3 m/s. The good news is there are likely to be more sunny days in September, from 2 to 3.
Next month (October) brings a further decline in the weather.
Wind
The average wind speed is 4 m/s getting up to 6 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Zanzibar is gradually increasing during September, going from 3 m/s to 4 m/s over the course of the month.
Rain
How was the weather last September in Zanzibar?
Climate Change over Years
The climate in Zanzibar in September has not changed much over the last 43 years.
The average temperature was the lowest in 1984 (+27°C) and the highest in 2019 (+29°C). The driest year was 2003 with only 487 mm of rainfall, and the wettest year was 1997 with 1353 mm.
FAQ
Is September a good time to visit Zanzibar?
Can you sunbathe in Zanzibar in September?
Can you swim in Zanzibar in September?
Is Zanzibar rainy in September?
Is it sunny in Zanzibar in September?
Other cities in Tanzania
Monthly weather in Zanzibar
Source of the data
For this page, we’ve looked at the typical weather in Zanzibar, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.