September weather forecastBonna, Namibia
September
Weather in September
The first month of the spring, September, is also a moderately hot month in Bonna, Namibia, with an average temperature varying between 27.3°C (81.1°F) and 12.7°C (54.9°F).Temperature
With the onset of September, Bonna experiences a subtle temperature shift, with the average high-temperature moving from 23.6°C (74.5°F) in August to a still moderately hot 27.3°C (81.1°F). Bonna observes a dramatic plunge from daytime highs in September, settling at an average low-temperature of 12.7°C (54.9°F).Humidity
The months with the lowest humidity are September and October, with an average relative humidity of 19%.Rainfall
January through May, September through December are months with rainfall. September is the first month it rains. Throughout September, in the average 1.6 rainfall days, it receives 2mm (0.08") of precipitation. Throughout the year, there are 80.2 rainfall days, and 304mm (11.97") of precipitation is accumulated.Daylight
In September, the average length of the day is 11h and 58min.On the first day of September, sunrise is at 07:05 and sunset at 18:45. On the last day of the month, sunrise is at 06:36 and sunset at 18:54 CAT.
Sunshine
The average sunshine in September is 9.9h.UV index
In September, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: A maximum high daily UV index of 5 during September translates into the following directions:
Take necessary precautions - Defending against sun damage is advocated. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Bonna, Namibia
- Average high temperature in September: 27.3°C
The warmest months (with the highest average high temperature) are October and November (29.5°C).
The month with the lowest average high temperature is July (19.8°C).
- Average low temperature in September: 12.7°C
The month with the highest average low temperature is January (18.9°C).
The coldest month (with the lowest average low temperature) is July (6°C).
Average pressure in September
Bonna, Namibia
- Average pressure in September: 1016.2mbar
The month with the highest atmospheric pressure is July (1021.3mbar).
The month with the lowest atmospheric pressure is January (1010.7mbar).
Average wind speed in September
Bonna, Namibia
- Average wind speed in September: 11.7km/h
The windiest month (with the highest average wind speed) is October (12.6km/h).
The calmest month (with the lowest average wind speed) is March (9.3km/h).
Average humidity in September
Bonna, Namibia
- Average humidity in September: 19%
The month with the highest relative humidity is March (51%).
The months with the lowest relative humidity are September and October (19%).
Average rainfall in September
Bonna, Namibia
- Average rainfall in September: 2mm
The wettest month (with the highest rainfall) is February (102mm).
The driest months (with the least rainfall) are June, July and August (0mm).
Average rainfall days in September
Bonna, Namibia
- Average rainfall days in September: 1.6 days
The month with the highest number of rainy days is February (15.9 days).
The month with the least rainy days is August (0 days).
Average daylight in September /
Average sunshine in September
Bonna, Namibia
- Average daylight in September: 12h and 0min
The month with the longest days is December (Average daylight: 13h and 30min).
The month with the shortest days is June (Average daylight: 10h and 42min).
- Average sunshine in September: 9h and 54min
The month with the most sunshine is November (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 9h and 24min).
Average sunshine days in September
Bonna, Namibia
- Average sunshine days in September: 27.9 days
The month with the most sunshine days is July (30.7 days).
The month with the least sunshine days is February (9.8 days).
Average UV index in September
Bonna, Namibia
- Average UV index in September: 5
The months with the highest UV index are January, February, October, November and December (UV index 6).
The months with the lowest UV index are June and July (UV index 4).
Average cloud cover in September
Bonna, Namibia
- Average cloud cover in September: 6
The month with the most cloud cover is February (Cloud cover 22).
The month with the least cloud cover is August (Cloud cover 1).
Average visibility in September
Bonna, Namibia
- 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).
