Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
September witnesses a subtle temperature ascent, adjusting from a pleasant 22.7°C (72.9°F) in August to a moderately hot 27°C (80.6°F). From significant daily highs, Derby's nights in September cool down to an average low-temperature of 12.4°C (54.3°F).Humidity
The least humid month is September, with an average relative humidity of 32%.Rainfall
In Derby, during September, the rain falls for 3.2 days and regularly aggregates up to 4mm (0.16") of precipitation. Throughout the year, there are 118.3 rainfall days, and 411mm (16.18") of precipitation is accumulated.Daylight
The average length of the day in September is 11h and 57min.On the first day of the month, sunrise is at 06:23 and sunset at 17:59. On the last day of September, in Derby, sunrise is at 05:51 and sunset at 18:11 SAST.
Sunshine
The average sunshine in September is 10h.UV index
The average daily maximum UV index in September in Derby is 5. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for ordinary individuals.Note: The maximum daily UV index, 5 in September, converts into the following recommendations:
Take necessary precautions - Suggestions to elude sunburn are provided. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
Frequently asked questions
What is the average September temperature in Derby?
What is the least humid month in Derby?
What is the average humidity in September in Derby?
How many days does it rain in September in Derby?
How many hours of daylight does Derby have in September?
When is the sunrise / sunset in September in Derby?
How long on average sun shines in September in Derby?
What is the UV index intensity in September in Derby?
Average temperature in September
Derby, South Africa
- Average high temperature in September: 27°C
The warmest month (with the highest average high temperature) is January (29.3°C).
The month with the lowest average high temperature is July (18.9°C).
- Average low temperature in September: 12.4°C
The months with the highest average low temperature are January and December (18°C).
The coldest month (with the lowest average low temperature) is July (6.3°C).
Average pressure in September
Derby, South Africa
- Average pressure in September: 1018mbar
The month with the highest atmospheric pressure is July (1024.4mbar).
The month with the lowest atmospheric pressure is January (1012.3mbar).
Average wind speed in September
Derby, South Africa
- Average wind speed in September: 10.1km/h
The windiest month (with the highest average wind speed) is October (10.6km/h).
The calmest months (with the lowest average wind speed) are March and May (7km/h).
Average humidity in September
Derby, South Africa
- Average humidity in September: 32%
The month with the highest relative humidity is February (61%).
The month with the lowest relative humidity is September (32%).
Average rainfall in September
Derby, South Africa
- Average rainfall in September: 4mm
The wettest month (with the highest rainfall) is December (95mm).
The driest months (with the least rainfall) are July and August (1mm).
Average rainfall days in September
Derby, South Africa
- Average rainfall days in September: 3.2 days
The month with the highest number of rainy days is January (20.7 days).
The month with the least rainy days is August (1 days).
Average daylight in September /
Average sunshine in September
Derby, South Africa
- Average daylight in September: 11h and 5min
The month with the longest days is December (Average daylight: 13h and 42min).
The month with the shortest days is June (Average daylight: 10h and 30min).
- Average sunshine in September: 10h and 0min
The month with the most sunshine is October (Average sunshine: 11h and 54min).
The months with the least sunshine are June and August (Average sunshine: 7h and 30min).
Average sunshine days in September
Derby, South Africa
- Average sunshine days in September: 25.4 days
The month with the most sunshine days is July (29.3 days).
The month with the least sunshine days is January (6.6 days).
Average UV index in September
Derby, South Africa
- Average UV index in September: 5
The months with the highest UV index are January, February, March, October, November and December (UV index 6).
The months with the lowest UV index are May, June and July (UV index 4).
Average cloud cover in September
Derby, South Africa
- Average cloud cover in September: 7
The months with the most cloud cover are January and December (Cloud cover 24).
The months with the least cloud cover are July and August (Cloud cover 5).
Average visibility in September
Derby, South Africa
- 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).
Derby, South Africa
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