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
In September, the meteorological conditions change slightly, with the average high-temperature moving from a tropical 92.8°F (33.8°C) in August to a still hot 86.9°F (30.5°C). The temperature lowers to an average of 66°F (18.9°C) during September nights.Heat index
Throughout September, the heat index is evaluated at a fiery hot 98.6°F (37°C). Take extra safety measures to prevent heat exhaustion and heat cramps. Heatstroke could follow lengthy activity.Regarding the heat index, one should be aware it's determined by shaded settings and mild winds. Exposure to the direct sun could elevate the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', binds temperature metrics with humidity values to give a sense of the actual warmth. The impression of weather on a person can be swayed by additional aspects, including metabolic variations, pregnancy, and activity levels. You should know that direct sun exposure can heighten weather effects, potentially elevating the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Young ones are generally more prone to risk than adults due to their reduced ability to sweat. Their large skin surface area relative to their diminutive bodies and elevated heat production from their activities further enhance this risk.
When temperatures rise, the human body turns to perspiration, using the cooling power of evaporating sweat. Elevated relative humidity disrupts typical body cooling by reducing the evaporation rate, consequently decreasing the body's cooling rate and enhancing the feeling of heat. If the body retains more heat than it can expel, the increasing temperature can lead to heat-related conditions.
Humidity
The average relative humidity in September is 71%.Rainfall
In Harlow, in September, it is raining for 11.5 days, with typically 1.77" (45mm) of accumulated precipitation. In Harlow, during the entire year, the rain falls for 144.9 days and collects up to 29.17" (741mm) of precipitation.Snowfall
In Harlow, snow does not fall in April through November.Daylight
In Harlow, Arkansas, the average length of the day in September is 12h and 22min.On the first day of the month, sunrise is at 6:44 am and sunset at 7:35 pm. On the last day of September, in Harlow, sunrise is at 7:04 am and sunset at 6:55 pm CDT.
Sunshine
In September, the average sunshine is 9.6h.UV index
In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: The maximum daily UV index of 5 during September translates into the following directions:
Heed the precautions - Suggestions to avoid sunburn are made. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is September in Harlow?
What is the average humidity in September in Harlow?
How many days does it rain in September in Harlow?
When it does not snow in Harlow?
What is the average length of the day in September in Harlow?
When are sunrise and sunset in September in Harlow?
How long on average sun shines in September in Harlow?
What is the UV index intensity in September in Harlow?
Average temperature in September
Harlow, AR
- Average high temperature in September: 86.9°F
The warmest month (with the highest average high temperature) is July (93.2°F).
The month with the lowest average high temperature is January (50.9°F).
- Average low temperature in September: 66°F
The month with the highest average low temperature is July (72.1°F).
The coldest month (with the lowest average low temperature) is January (35.2°F).
Average pressure in September
Harlow, AR
- Average pressure in September: 29.99"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
Harlow, AR
- Average wind speed in September: 5mph
The windiest month (with the highest average wind speed) is April (7.5mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).
Average humidity in September
Harlow, AR
- Average humidity in September: 71%
The months with the highest relative humidity are March and December (80%).
The month with the lowest relative humidity is October (70%).
Average rainfall in September
Harlow, AR
- Average rainfall in September: 1.77"
The wettest month (with the highest rainfall) is April (3.23").
The driest month (with the least rainfall) is November (1.42").
Average rainfall days in September
Harlow, AR
- Average rainfall days in September: 11.5 days
The month with the highest number of rainy days is July (16 days).
The month with the least rainy days is November (7.9 days).
Average snowfall in September
Harlow, AR
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.59").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Harlow, AR
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1.7 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
Harlow, AR
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in September: 9h and 4min
The months with the most sunshine are June and July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).
Average sunshine days in September
Harlow, AR
- Average sunshine days in September: 15.6 days
The month with the most sunshine days is October (20.3 days).
The months with the least sunshine days are July and August (12.4 days).
Average UV index in September
Harlow, AR
- Average UV index in September: 5
The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in September
Harlow, AR
- Average cloud cover in September: 29
The month with the most cloud cover is February (Cloud cover 49).
The months with the least cloud cover are June and August (Cloud cover 28).
Average visibility in September
Harlow, AR
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Harlow, Arkansas, USA
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