September weather forecast
Mombasa, Kenya

Buildings along the shores of the Indian Ocean in Mombasa, Kenya
Buildings along the shores of the Indian Ocean in Mombasa, Kenya

Weather in September

The first month of the spring, September, is also a moderately hot month in Mombasa, Kenya, with an average temperature fluctuating between 28°C (82.4°F) and 22.5°C (72.5°F).

Temperature

In Mombasa, the average high-temperature in September is almost the same as in August - a still moderately hot 28°C (82.4°F). The average low-temperature, in Mombasa, Kenya, is 22.5°C (72.5°F).

Heat index

In September, the average heat index is computed to be a tropical 32°C (89.6°F). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'felt air temperature', 'apparent temperature', or 'real feel', is a measure of how hot it feels when the actual air humidity is factored in. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (pregnancy, wind, differences in body mass, height, and shape). Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

January, May, September through December, with an average relative humidity of 77%, are the most humid months in Mombasa.

Rainfall

In Mombasa, during September, the rain falls for 11.2 days and regularly aggregates up to 12mm (0.47") of precipitation. In Mombasa, during the entire year, the rain falls for 167.2 days and collects up to 312mm (12.28") of precipitation.

Sea temperature

In Mombasa, the average water temperature is 25.8°C (78.4°F).
Note: For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

Daylight

In September, the average length of the day is 12h and 5min.
On the first day of the month, sunrise is at 06:20 and sunset at 18:22. On the last day of September, in Mombasa, sunrise is at 06:07 and sunset at 18:15 EAT.

Sunshine

In September, the average sunshine in Mombasa is 8.4h.

UV index

The months with the highest UV index in Mombasa are January through June, September through December, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 7 in September transform into the following instructions:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.
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FAQ

What is the temperature in September in Mombasa?

The average high-temperature, in September, in Mombasa, Kenya, is 28°C (82.4°F), while the average low-temperature is 22.5°C (72.5°F). in September, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which combines air temperature and relative humidity, is computed to be 32°C (89.6°F).

What is the most humid month in Mombasa?

The months with the highest humidity are January, May, September through December, with an average relative humidity of 77%.

What is the average humidity in September in Mombasa?

In Mombasa, the average relative humidity in September is 77%.

How many days does it rain in September in Mombasa?

In Mombasa, Kenya, during September, the rain falls for 11.2 days and regularly aggregates up to 12mm (0.47") of precipitation.

What is the water temperature in September in Mombasa?

In Mombasa, Kenya, the average seawater temperature in September is 25.8°C (78.4°F). For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

What is the average length of the day in September in Mombasa?

The average day length in September is 12h and 5min.

When is the sunrise / sunset in September in Mombasa?

In September, on the first day of the month, sunrise is at 06:20 and sunset at 18:22. On the last day of the month, in Mombasa, Kenya, sunrise is at 06:07 and sunset at 18:15 EAT.

How many hours of sunshine does Mombasa have in September?

In Mombasa, Kenya, the average sunshine duration in September is 8.4h.

What are the months with the highest UV index in Mombasa?

The months with the highest UV index are January through June, September through December, with an average maximum UV index of 7.

What is the UV index intensity in September in Mombasa?

In September, the average daily maximum UV index in Mombasa is 7. A UV Index estimate of 6 to 7 represents a high health threat from unsafe exposure to Sun's UV rays.

Average temperature in September
Mombasa, Kenya

Average temperature in September - Mombasa, Kenya
  • Average high temperature in September: 28°C

The warmest month (with the highest average high temperature) is March (31.6°C).
The month with the lowest average high temperature is July (27.3°C).

  • Average low temperature in September: 22.5°C

The months with the highest average low temperature are March and April (25.3°C).
The coldest month (with the lowest average low temperature) is August (22°C).

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Average pressure in September
Mombasa, Kenya

Average pressure in September - Mombasa, Kenya
  • Average pressure in September: 1015.3mbar

The month with the highest atmospheric pressure is July (1016.1mbar).
The month with the lowest atmospheric pressure is February (1010.5mbar).

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Average wind speed in September
Mombasa, Kenya

Average wind speed in September - Mombasa, Kenya
  • Average wind speed in September: 18.6km/h

The windiest month (with the highest average wind speed) is July (23.2km/h).
The calmest month (with the lowest average wind speed) is March (11.9km/h).

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Average humidity in September
Mombasa, Kenya

Average humidity in September - Mombasa, Kenya
  • Average humidity in September: 77%

The months with the highest relative humidity are January, May, September, October, November and December (77%).
The month with the lowest relative humidity is July (74%).

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Average rainfall in September
Mombasa, Kenya

Average rainfall in September - Mombasa, Kenya
  • Average rainfall in September: 12mm

The wettest month (with the highest rainfall) is May (48mm).
The driest month (with the least rainfall) is June (10mm).

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Average rainfall days in September
Mombasa, Kenya

Average rainfall days in September - Mombasa, Kenya
  • Average rainfall days in September: 11.2 days

The month with the highest number of rainy days is December (21.2 days).
The month with the least rainy days is February (8.8 days).

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Average sea temperature in September
Mombasa, Kenya

Average sea temperature in September - Mombasa, Kenya
  • Average sea temperature in September: 25.8°C

The best month for swimming (with the highest average sea temperature) is April (29.3°C).
The coldest month (with the lowest average sea temperature) is August (25.4°C).

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Average daylight in September /
Average sunshine in September
Mombasa, Kenya

Average daylight in September / Average sunshine in September - Mombasa, Kenya
  • Average daylight in September: 12h and 5min

The month with the longest days is December (Average daylight: 12h and 21min).
The month with the shortest days is June (Average daylight: 11h and 53min).

  • Average sunshine in September: 8h and 24min

The month with the most sunshine is November (Average sunshine: 10h and 30min).
The month with the least sunshine is May (Average sunshine: 7h and 54min).

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Average sunshine days in September
Mombasa, Kenya

Average sunshine days in September - Mombasa, Kenya
  • Average sunshine days in September: 8.8 days

The month with the most sunshine days is February (15.3 days).
The month with the least sunshine days is December (7 days).

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Average UV index in September
Mombasa, Kenya

Average UV index in September - Mombasa, Kenya
  • Average UV index in September: 7

The months with the highest UV index are January, February, March, April, May, June, September, October, November and December (UV index 7).
The months with the lowest UV index are July and August (UV index 6).

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Average cloud cover in September
Mombasa, Kenya

Average cloud cover in September - Mombasa, Kenya
  • Average cloud cover in September: 42

The month with the most cloud cover is October (Cloud cover 45).
The month with the least cloud cover is December (Cloud cover 30).

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Average visibility in September
Mombasa, Kenya

Average visibility in September - Mombasa, Kenya
  • Average visibility in September: 10km

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).

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