Mombasa weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Good
Best time to visit: October – February
What is the weather like in Mombasa in September?
In September, Mombasa is hot: daytime highs average 28 °C, and even at night it stays warm at around 23 °C. The sea averages 25.8 °C – pleasant for swimming. The sun shines for around 8 hours a day. It is the rainy season: rain falls on about 18 days, totalling 54 mm. The air is often humid and muggy. All in all, September is a good month for a holiday in Mombasa.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 77 | 78 | 79 |
| Day | 27° | 28° | 29° |
| Night | 22° | 23° | 23° |
| Sea | 26° | 26° | 27° |
| Sun | 8 h | 8 h | 8 h |
| Rain days | 20 | 18 | 17 |
More details for September
- Daylight
- 12 h 5 min06:14 – 18:19
- UV index
- 14 · extremeclear sky, noon (estimate)
- Muggy days
- 30 daysdew point 18 °C or more
- Wind
- 19 km/haverage daily peak
- Cloud cover
- 42 %on average
- Hot days
- 0 days30 °C or more
- Time zone
- UTC+3Africa/Nairobi
How the score comes together
- Temperatureweight 35 %100 %
- Seaweight 25 %100 %
- Sunshineweight 20 %90 %
- Few rainy daysweight 20 %2 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in September
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Insect repellent
- Rain jacket or umbrella
Mombasa in September: quick answers
Is Mombasa hot in September?
Yes. In September, Mombasa is hot: daytime highs average 28 °C and nights stay around 23 °C.
Can you swim in Mombasa in September?
Yes. In September the sea averages 25.8 °C – pleasant for swimming.
Does it rain much in Mombasa in September?
It rains often – on about 18 days, adding up to 54 mm.
Mombasa month by month
The whole year in MombasaAll destinations: Kenya
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, GeoNames (CC BY 4.0)