Weather in Mombasa in September 2025
Average weather
Average temperature in Mombasa in September
The temperature in September is +29°C on average, with a range between a maximum of +30°C during the day and a minimum of +23°C at night.
The average maximum temperature goes up 14% by the end of the month, compared with the beginning of the month, from +28°C to +29°C.
Is Mombasa warm or cold in September?
Mombasa is typically warm in September.
Maximum temperatures go up compared to the previous month from +27°C to +28°C. The minimum temperature also goes up from +22°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 Mombasa:
Water temperature in Mombasa in September
Water in Mombasa 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 +28°C.
The water temperature in September is one of the coldest of the entire year:
Can you swim in Mombasa in September?
Climate in Mombasa in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +27°C | +28°C | +29°C | ||||
| Min. temperature | ||||||
| +20°C | +20°C | +21°C | ||||
| Max. temperature | ||||||
| +30°C | +30°C | +32°C | ||||
| Rainfall | ||||||
| 65 mm | 54 mm | 76 mm | ||||
| Wind | ||||||
| 3 m/s | 3 m/s | 2 m/s | ||||
| Avg. water temperature | ||||||
| +25°C | +26°C | +27°C | ||||
| Humidity | ||||||
| 81% | 80% | 80% | ||||
| Air pressure | ||||||
| 1015 HPa | 1014 HPa | 1012 HPa | ||||
| Sunny days | ||||||
| 0 | 1 | 1 | ||||
| Cloudy days | ||||||
| 2 | 2 | 3 | ||||
| Rainy days | ||||||
| 29 | 27 | 27 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as ok as in August. It’s getting warmer as September arrives. The average maximum temperature goes up from +27°C to +28°C during the day. As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 65 mm to 54 mm. It feels drier, as humidity decreases from 81% to 80%. 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 0 to 1.
October brings much the same weather, it remains ok.
Wind
The average wind speed is 4 m/s getting up to 5 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Mombasa is gradually increasing during September, going from 4 m/s to 4 m/s over the course of the month.
Rain
How was the weather last September in Mombasa?
Climate Change over Years
The climate in Mombasa in September has not changed much over the last 43 years.
The average temperature was the lowest in 1979 (+29°C) and the highest in 2023 (+30°C). The driest year was 2021 with only 554 mm of rainfall, and the wettest year was 2019 with 1484 mm.
FAQ
Is September a good time to visit Mombasa?
Can you sunbathe in Mombasa in September?
Can you swim in Mombasa in September?
Is Mombasa rainy in September?
Is it sunny in Mombasa in September?
Other cities in Kenya
Monthly weather in Mombasa
Source of the data
For this page, we’ve looked at the typical weather in Mombasa, 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.