September weather forecast
Nairobi, Kenya

A small lake in Uhuru Park within the city of Nairobi, Kenya
A small lake in Uhuru Park within the city of Nairobi, Kenya

Weather in September

September, the first month of the spring in Nairobi, is still a warm month, with an average temperature ranging between max 24.6°C (76.3°F) and min 14.2°C (57.6°F).

Temperature

In Nairobi, the average high-temperature in September is almost the same as in August - a still warm 24.6°C (76.3°F). In Nairobi, the average low-temperature is 14.2°C (57.6°F).

Humidity

In September, the average relative humidity is 67%.

Rainfall

In Nairobi, Kenya, during 16.5 rainfall days, 31mm (1.22") of precipitation is typically accumulated. Throughout the year, there are 241.5 rainfall days, and 676mm (26.61") of precipitation is accumulated.

Daylight

In Nairobi, the average length of the day in September is 12h and 7min.
On the first day of September, sunrise is at 06:30 and sunset at 18:35. On the last day of the month, sunrise is at 06:19 and sunset at 18:26 EAT.

Sunshine

In Nairobi, the average sunshine in September is 9.4h.

UV index

With an average maximum UV index of 6, September is the month with the highest UV index. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 6 in September transform into the following instructions:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the average humidity in September in Nairobi?

In September, the average relative humidity in Nairobi, Kenya, is 67%.

How much does it rain in Nairobi in September?

In September, the rain falls for 16.5 days. Throughout September, 31mm (1.22") of precipitation is accumulated.

How many hours of daylight does Nairobi have in September?

In September, the average day length is 12h and 7min.

What time are sunrise and sunset in September in Nairobi?

On the first day of September in Nairobi, Kenya, sunrise is at 06:30 and sunset at 18:35. On the last day of the month, sunrise is at 06:19 and sunset at 18:26 EAT.

How many hours of sunshine does Nairobi have in September?

In Nairobi, the average sunshine duration in September is 9.4h.

What is the month with the highest UV index in Nairobi?

The month with the highest UV index in Nairobi is September, with an average maximum UV index of 6.

What is the UV index intensity in September in Nairobi?

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

Average temperature in September
Nairobi, Kenya

Average temperature in September - Nairobi, Kenya
  • Average high temperature in September: 24.6°C

The warmest month (with the highest average high temperature) is February (27°C).
The month with the lowest average high temperature is June (22.4°C).

  • Average low temperature in September: 14.2°C

The month with the highest average low temperature is April (15.6°C).
The coldest month (with the lowest average low temperature) is July (12.7°C).

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Average pressure in September
Nairobi, Kenya

Average pressure in September - Nairobi, Kenya
  • Average pressure in September: 1015.6mbar

The month with the highest atmospheric pressure is July (1016.8mbar).
The months with the lowest atmospheric pressure are February and March (1013.4mbar).

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Average wind speed in September
Nairobi, Kenya

Average wind speed in September - Nairobi, Kenya
  • Average wind speed in September: 9.1km/h

The windiest month (with the highest average wind speed) is February (11.8km/h).
The calmest month (with the lowest average wind speed) is June (6.1km/h).

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Average humidity in September
Nairobi, Kenya

Average humidity in September - Nairobi, Kenya
  • Average humidity in September: 67%

The month with the highest relative humidity is May (84%).
The month with the lowest relative humidity is February (65%).

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Average rainfall in September
Nairobi, Kenya

Average rainfall in September - Nairobi, Kenya
  • Average rainfall in September: 31mm

The wettest month (with the highest rainfall) is April (125mm).
The driest month (with the least rainfall) is January (28mm).

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Average rainfall days in September
Nairobi, Kenya

Average rainfall days in September - Nairobi, Kenya
  • Average rainfall days in September: 16.5 days

The month with the highest number of rainy days is May (27.7 days).
The month with the least rainy days is January (12.3 days).

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

Average daylight in September / Average sunshine in September - Nairobi, Kenya
  • Average daylight in September: 12h and 7min

The month with the longest days is December (Average daylight: 12h and 12min).
The month with the shortest days is June (Average daylight: 12h and 3min).

  • Average sunshine in September: 9.4h

The months with the most sunshine are January and February (Average sunshine: 9.6h).
The months with the least sunshine are April and May (Average sunshine: 8.5).

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Average sunshine days in September
Nairobi, Kenya

Average sunshine days in September - Nairobi, Kenya
  • Average sunshine days in September: 10.3 days

The month with the most sunshine days is January (15.3 days).
The month with the least sunshine days is April (1.9 days).

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Average UV index in September
Nairobi, Kenya

Average UV index in September - Nairobi, Kenya
  • Average UV index in September: 6

The month with the highest UV index is September (UV index 6).
The months with the lowest UV index are January, February, March, April, May, June, July, August, October, November and December (UV index 5).

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Average cloud cover in September
Nairobi, Kenya

Average cloud cover in September - Nairobi, Kenya
  • Average cloud cover in September: 36

The month with the most cloud cover is May (Cloud cover 54).
The month with the least cloud cover is February (Cloud cover 25).

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Average visibility in September
Nairobi, Kenya

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

The months with the highest visibility are September and October (10km).
The months with the lowest visibility are April and May (7km).

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