Nairobi
Kenya
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Nairobi, Kenya

A small lake in the Uhuru Park within the city of Nairobi, Kenya, with a distant view of the city skyscrapers
A small lake in the Uhuru Park within the city of Nairobi, Kenya, with a distant view of the city skyscrapers
The first month of the spring, September, is a moderately hot month in Nairobi, Kenya, with average temperature varying between 25°C (77°F) and 9.7°C (49.5°F).

Temperature

In Nairobi, the average high-temperature in September is practically the same as in August - a moderately hot 25°C (77°F). In Nairobi, Kenya, the average low-temperature is 9.7°C (49.5°F).

Rainfall

In Nairobi, Kenya, during 4 rainfall days, 31.2mm (1.2") of precipitation is typically accumulated. In Nairobi, during the entire year, the rain falls for 90 days and collects up to 1061.5mm (41.8") of precipitation.

Daylight

In Nairobi, the average length of the day is 12.1h.

Sunshine

In Nairobi, the average sunshine is 6h.

UV index

January through May, August through December, with an average maximum UV index of 12, are months with the highest UV index. A UV Index of 11, and more, symbolizes an extreme threat to health from the exposure to the Sun's UV rays for the average person.
In September, the average maximum UV index of 12 translate into the following recommendations:
Practice all essential precautions. Protection against sun damage is crucial. 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. 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.

What is the temperature in September in Nairobi?

The average high-temperature, in September, is 25°C (77°F), while the average low-temperature is 9.7°C (49.5°F).

How many days does it rain in September in Nairobi?

In September, in Nairobi, the rain falls for 4 days. Throughout September, 31.2mm (1.2") of precipitation is accumulated.

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

In September, the average length of the day in Nairobi, Kenya, is 12.1h.

How many hours of sunshine does Nairobi have in September?

In September, the average sunshine in Nairobi, Kenya, is 6h.

When is the highest UV index in Nairobi?

January through May, August through December, with an average maximum UV index of 12, are months with the highest UV index in Nairobi, Kenya.

How high is the UV index in September in Nairobi?

The average daily maximum UV index in September in Nairobi is 12. A UV Index estimate of 11, and higher, represents an extreme health threat from unprotected exposure to the UV radiation.
Average temperature in September - Nairobi, Kenya
  • Average high temperature in September: 25°C

The warmest month (with the highest average high temperature) is March (26.8°C).
The month with the lowest average high temperature is July (22°C).

  • Average low temperature in September: 9.7°C

The month with the highest average low temperature is April (13.4°C).
The coldest month (with the lowest average low temperature) is August (9.1°C).

Average rainfall in September - Nairobi, Kenya
  • Average rainfall in September: 31.2mm

The wettest month (with the highest rainfall) is April (242.3mm).
The driest month (with the lowest rainfall) is July (17.6mm).

Average rainfall days in September - Nairobi, Kenya
  • Average rainfall days in September: 4 days

The month with the highest number of rainy days is April (15 days).
The month with the lowest number of rainy days is July (3 days).

Average daylight in September / Average sunshine in September - Nairobi, Kenya
  • Average daylight in September: 12.1h

Months with the longest days are January, February, November and December (Average daylight: 12.2h).
The month with shortest days is June (Average daylight: 12h).

  • Average sunshine in September: 6h

The month with most sunshine is February (Average sunshine: 9.5h).
The month with least sunshine is August (Average sunshine: 4.1h).

Average UV index in September - Nairobi, Kenya
  • Average UV index in September: 12

Months with the highest UV index are January, February, March, April, May, August, September, October, November and December (UV index 12).
Months with the lowest UV index are June and July (UV index 11).