September weather forecastRuiru, Kenya

September

Weather in September

The first month of the spring, September, is still a warm month in Ruiru, Kenya, with an average temperature fluctuating between 25.5°C (77.9°F) and 13.9°C (57°F).

Temperature

The start of September sees the average high-temperature at a still warm 25.5°C (77.9°F), showing little difference from August's 23.8°C (74.8°F). Ruiru throughout September, experiences an average nighttime temperature of 13.9°C (57°F).

Humidity

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

Rainfall

In September, in Ruiru, the rain falls for 16.3 days. Throughout September, 35mm (1.38") of precipitation is accumulated. In Ruiru, Kenya, during the entire year, the rain falls for 213.5 days and collects up to 642mm (25.28") of precipitation.

Daylight

In Ruiru, the average length of the day in September is 12h and 7min.
On the first day of the month, sunrise is at 06:29 and sunset at 18:34. On the last day of September, sunrise is at 06:18 and sunset at 18:25 EAT.

Sunshine

In Ruiru, Kenya, the average sunshine in September is 9.3h.

UV index

September is the month with the highest UV index, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The maximum UV index of 6 during September leads to these instructions:
Fend off overexposure. Sun protection is vital. Avoid direct exposure to the Sun between 10 a.m. and 4 p.m., the peak period for UV radiation, noting that objects like parasols or canopies might not offer complete sun protection. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.

Updated: Jan 31, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

In Ruiru, 25.5°C (77.9°F) is the average high-temperature and 13.9°C (57°F) is the average low-temperature during September. The average heat index (a.k.a. 'feels like', 'felt air temperature'), which factors the actual air temperature with the relative humidity, in March is evaluated at 29°C (84.2°F).

The average relative humidity in September in Ruiru, Kenya, is 67%.

In Ruiru, Kenya, in September, it is raining for 16.3 days, with typically 35mm (1.38") of accumulated precipitation.

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

In September, on the first day of the month, sunrise is at 06:29 and sunset at 18:34. On the last day of the month, in Ruiru, sunrise is at 06:18 and sunset at 18:25 EAT.

The average sunshine duration in September is 9.3h.

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

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

Today

Tomorrow

Long-term

Year J F M A M J J A September O N D

Aug

September

Oct

Average high temperature

23.8°C

25.5°C

25.6°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

7.4km/h

7.8km/h

9.3km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average daylight

Average sunshine

Average sunshine days

8.9

9.9

7.5

Average UV index

Average cloud cover

Average visibility

Average temperature in September
Ruiru, Kenya

Average high temperature in September: 25.5°C

The warmest months (with the highest average high temperature) are February and March (27.3°C).
The months with the lowest average high temperature are June and July (23.3°C).

Average low temperature in September: 13.9°C

The month with the highest average low temperature is April (14.9°C).
The coldest month (with the lowest average low temperature) is July (12.6°C).

Average pressure in September
Ruiru, Kenya

Average pressure in September: 1015.6mbar

The month with the highest atmospheric pressure is July (1016.6mbar).
The months with the lowest atmospheric pressure are February and March (1013.4mbar).

Average wind speed in September
Ruiru, Kenya

Average wind speed in September: 7.3km/h

The windiest month (with the highest average wind speed) is February (10.5km/h).
The calmest month (with the lowest average wind speed) is June (5.4km/h).

Average humidity in September
Ruiru, 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
Ruiru, Kenya

Average rainfall in September: 35mm

The wettest month (with the highest rainfall) is April (117mm).
The driest month (with the least rainfall) is January (20mm).

Average rainfall days in September
Ruiru, Kenya

Average rainfall days in September: 16.3 days

The month with the highest number of rainy days is May (25.3 days).
The month with the least rainy days is January (8.5 days).

Average daylight in September /
Average sunshine in September
Ruiru, 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 6min).

Average sunshine in September: 9h and 18min

The months with the most sunshine are January and February (Average sunshine: 9h and 42min).
The month with the least sunshine is May (Average sunshine: 8h and 42min).

Average sunshine days in September
Ruiru, Kenya

Average sunshine days in September: 9.9 days

The month with the most sunshine days is January (21.3 days).
The month with the least sunshine days is April (3.3 days).

Average UV index in September
Ruiru, 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).