September weather forecastGreenfield, AR
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Greenfield, Arkansas, with an average temperature fluctuating between 64°F (17.8°C) and 82.2°F (27.9°C).Temperature
Greenfield observes a minor difference in average high-temperatures between August's 87.3°F (30.7°C) and September's 82.2°F (27.9°C). Greenfield in September experiences a low-temperature average of 64°F (17.8°C).Heat index
In September, the average heat index is estimated at a hot 87.8°F (31°C). Staying active during long-term exposure might result in a state of exhaustion and cause heat cramps.Keep in mind the heat index values are meant for areas in shade and with light wind. Uninterrupted exposure to the sun may boost the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is the outcome of merging air's temperature and its humidity metrics. A person's impression of weather can be affected by numerous aspects, among them metabolic variations, pregnancy, and activity levels. Be mindful that being in direct sunlight might mean feeling hotter, with the heat index rising by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for children. Kids are generally in more danger than adults because they perspire less. Their large skin surface area compared to their small bodies and the excessive heat due to their actions raises their risk.
Humidity
In Greenfield, the average relative humidity in September is 74%.Rainfall
In Greenfield, Arkansas, in September, during 12.4 rainfall days, 2.32" (59mm) of precipitation is typically accumulated. Throughout the year, there are 152.8 rainfall days, and 37.28" (947mm) of precipitation is accumulated.Snowfall
April through October are months without snowfall.Daylight
The average length of the day in September is 12h and 23min.On the first day of September, sunrise is at 6:35 am and sunset at 7:29 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:47 pm CDT.
Sunshine
The average sunshine in September is 9.6h.UV index
The average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the ordinary person.Note: The UV index of 5 during September leads to these advisories:
Preventative actions are necessary - Suggestions to safeguard against sun damage are in order. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Greenfield, AR
- Average high temperature in September: 82.2°F
The warmest month (with the highest average high temperature) is July (89.1°F).
The month with the lowest average high temperature is January (45.5°F).
- Average low temperature in September: 64°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 (32.9°F).
Average pressure in September
Greenfield, 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 (29.93"Hg).
Average wind speed in September
Greenfield, AR
- Average wind speed in September: 6.2mph
The windiest month (with the highest average wind speed) is February (9.6mph).
The calmest month (with the lowest average wind speed) is August (5.7mph).
Average humidity in September
Greenfield, AR
- Average humidity in September: 74%
The month with the highest relative humidity is March (78%).
The month with the lowest relative humidity is October (67%).
Average rainfall in September
Greenfield, AR
- Average rainfall in September: 2.32"
The wettest month (with the highest rainfall) is May (4.17").
The driest month (with the least rainfall) is January (2.28").
Average rainfall days in September
Greenfield, AR
- Average rainfall days in September: 12.4 days
The month with the highest number of rainy days is July (15.7 days).
The month with the least rainy days is December (10 days).
Average snowfall in September
Greenfield, AR
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.1").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Greenfield, AR
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and February (1.9 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
Greenfield, AR
- Average daylight in September: 12h and 24min
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 36min
The month with the most sunshine is June (Average sunshine: 10h and 54min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).
Average sunshine days in September
Greenfield, AR
- Average sunshine days in September: 16.1 days
The month with the most sunshine days is October (19.5 days).
The month with the least sunshine days is July (12.9 days).
Average UV index in September
Greenfield, AR
- Average UV index in September: 5
The month with the highest UV index is June (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in September
Greenfield, AR
- Average cloud cover in September: 28
The month with the most cloud cover is February (Cloud cover 47).
The month with the least cloud cover is June (Cloud cover 24).
Average visibility in September
Greenfield, AR
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
