September weather forecastNairobi, Kenya
September
Weather in September
With a steady rise in temperature, September signals the onset of the warm season in Nairobi. Following the consistent temperatures of August, September ends the cool weather streak and opens the door for warmer stormy months towards the year-end. The shift in weather does not contribute to an overly warm environment, with temperatures remaining comfortable around mid-twenties. Although rains are scarce towards the month's end, the city's overall ambiance stays fresh and inviting due to the balance between warmth and precipitation.Temperature
September's climate in Nairobi shows a minor adjustment in average high-temperatures to a still moderately hot 24.6°C (76.3°F) from August's 23°C (73.4°F). September nights experience a consistent temperature drop to a refreshing 14.2°C (57.6°F).Humidity
The average relative humidity in September is 67%.Rainfall
In Nairobi, in September, it is raining for 16.5 days, with typically 31mm (1.22") of accumulated precipitation. Throughout the year, there are 241.5 rainfall days, and 676mm (26.61") of precipitation is accumulated.Daylight
The average length of the day in September in Nairobi is 12h and 7min.On the first day of September, sunrise is at 06:29 and sunset at 18:35. On the last day of the month, sunrise is at 06:18 and sunset at 18:26 EAT.
Sunshine
The average sunshine in September is 9.4h.UV index
September is the month with the highest UV index in Nairobi, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for the ordinary person.Note: The UV index of 6 during September leads to these advisories:
Guard oneself from overexposure. Defence against sun injury is vital. Limit direct sun exposure especially between 10 a.m. and 4 p.m., when UV radiation is at its peak. However, keep in mind that shade structures may not provide full sun protection. Employ a wide-brim hat for potent defense against up to 50% of UV rays.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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).
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).
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).
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%).
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).
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).
Average daylight in September /
Average sunshine in September
Nairobi, Kenya
- Average daylight in September: 12h and 6min
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 0min).
- Average sunshine in September: 9h and 24min
The months with the most sunshine are January and February (Average sunshine: 9h and 36min).
The months with the least sunshine are April and May (Average sunshine: 8h and 30min).
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).
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).
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).
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).
