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 snowfall in September
- Average snowfall 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 marks a gentle change in average high-temperature, declining from August's hot 90.5°F (32.5°C) to a moderately hot 83.7°F (28.7°C). The nighttime temperature in London during September exhibits a clear drop from daytime highs, settling at an enjoyable 61.7°F (16.5°C).Heat index
The heat index for September is appraised at a tropical 91.4°F (33°C). Take additional safety steps, risk of heat exhaustion and heat cramps is notable. Prolonged activity may cause heatstroke.In terms of the heat index, values are set with light wind and shade conditions in mind. The presence of direct sunlight can raise the heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', unifies temperature and humidity readings to offer a comprehensive feel of warmth. The impact of weather on an individual can be subjective, affected by the person's activity and heat perception, which can vary due to elements including wind, clothing, and metabolic differences. Consider the fact that direct sun exposure can influence how hot one feels, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Children regularly disregard the necessity to rest and replenish fluids. Thirst is a late symptom of dehydration - thus, maintaining hydration, particularly during long-lasting physical activities, is essential.
Humidity
The average relative humidity in September is 74%.Rainfall
In London, during September, the rain falls for 13.3 days and regularly aggregates up to 2.4" (61mm) of precipitation. Throughout the year, in London, there are 156 rainfall days, and 37.56" (954mm) of precipitation is accumulated.Snowfall
April through November are months without snowfall in London.Daylight
The average length of the day in September is 12h and 23min.On the first day of the month, sunrise is at 6:45 am and sunset at 7:39 pm. On the last day of September, in London, sunrise is at 7:07 am and sunset at 6:57 pm CDT.
Sunshine
In London, the average sunshine in September is 9.4h.UV index
The average daily maximum UV index in September in London, Arkansas, is 6. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV radiation for the ordinary person.Note: In September, the UV index of 6 transforms into the following advice:
Adopt measures and apply sun safety strategies. Shielding from skin and eye damage is necessary. Limit your exposure to the sun's UV radiation, which is strongest between 10 a.m. and 4 p.m., and note that parasols or canopies may not provide full sun protection. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck.
Frequently asked questions
How hot is it in London in September?
What is the average humidity in September in London?
How many days does it rain in September in London?
When it does not snow in London?
What is the average length of the day in September in London?
When are sunrise and sunset in September in London?
How many hours of sunshine does London have in September?
What is the UV index reading in September in London?
Average temperature in September
London, AR
- Average high temperature in September: 83.7°F
The warmest month (with the highest average high temperature) is July (91.8°F).
The month with the lowest average high temperature is January (47.5°F).
- Average low temperature in September: 61.7°F
The month with the highest average low temperature is July (70°F).
The coldest month (with the lowest average low temperature) is January (31.3°F).
Average pressure in September
London, AR
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in September
London, AR
- Average wind speed in September: 4.4mph
The windiest month (with the highest average wind speed) is April (6.6mph).
The calmest months (with the lowest average wind speed) are July and August (4.2mph).
Average humidity in September
London, AR
- Average humidity in September: 74%
The months with the highest relative humidity are March and May (79%).
The months with the lowest relative humidity are July, August and October (73%).
Average rainfall in September
London, AR
- Average rainfall in September: 2.4"
The wettest month (with the highest rainfall) is May (4.84").
The driest month (with the least rainfall) is January (2.32").
Average rainfall days in September
London, AR
- Average rainfall days in September: 13.3 days
The months with the highest number of rainy days are May and July (16.3 days).
The month with the least rainy days is January (9.7 days).
Average snowfall in September
London, AR
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.83").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in September
London, AR
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1.8 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
London, AR
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in September: 9h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The months with the least sunshine are January and February (Average sunshine: 5h and 24min).
Average sunshine days in September
London, AR
- Average sunshine days in September: 15 days
The month with the most sunshine days is December (19.2 days).
The month with the least sunshine days is July (12.7 days).
Average UV index in September
London, AR
- Average UV index in September: 6
The month with the highest UV index is June (UV index 7).
The months with the lowest UV index are January and December (UV index 2).
Average cloud cover in September
London, AR
- Average cloud cover in September: 29
The months with the most cloud cover are February and March (Cloud cover 45).
The months with the least cloud cover are June, July and August (Cloud cover 27).
Average visibility in September
London, AR
- Average visibility in September: 6mi
The months with the highest visibility are February, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, March, April, May and December (5mi).
London, Arkansas, USA
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