September weather forecastPortland, AR
September
Weather in September
The first month of the autumn, September, is still a tropical month in Portland, Arkansas, with temperature in the range of an average low of 67.3°F (19.6°C) and an average high of 86°F (30°C).Temperature
The shift to September signals an average high-temperature of a still tropical 86°F (30°C), subtly varied from August's 89.6°F (32°C). The average low-temperature during September nights is an enjoyable 67.3°F (19.6°C).Heat index
For September, the heat index is computed to be a torrid 96.8°F (36°C). Adopt special protective actions against heat exhaustion and heat cramps. Long-duration activity risks heatstroke.It is important to note that the heat index values are for shaded areas and light wind scenarios. 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 'real feel', integrates the air's temperature and its humidity to showcase the felt temperature by people. An individual's perception of weather can be influenced by a variety of factors including metabolic differences, being pregnant, and their degree of physical exertion. One should be aware that direct sunshine can amplify the perceived temperature, raising the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children typically face greater hazards than adults because they do not sweat as much. Their larger skin surface in comparison to their little bodies and the high heat production from their active nature compounds their vulnerability.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. Elevated relative humidity diminishes evaporation, thereby reducing the body's ability to shed heat and creating a feeling of being too warm. Overheating and dehydration threats arise when heat gain goes beyond what the body can comfortably shed.
Humidity
The average relative humidity in September is 72%.Rainfall
In Portland, in September, during 12.8 rainfall days, 2.72" (69mm) of precipitation is typically accumulated. Throughout the year, there are 158.8 rainfall days, and 40.67" (1033mm) of precipitation is accumulated.Snowfall
April through October and December are months without snowfall.Daylight
In September, the average length of the day in Portland, Arkansas, is 12h and 22min.On the first day of September, sunrise is at 6:40 am and sunset at 7:30 pm. On the last day of the month, sunrise is at 7:00 am and sunset at 6:51 pm CDT.
Sunshine
The average sunshine in September is 9.9h.UV index
In September, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: The maximum daily UV index of 6 during September translates into the following directions:
Undertake protective measures and comply with sun safety rules. Shielding against skin and eye damage is essential. Remember that UV radiation from the Sun is strongest between 10 a.m. and 4 p.m. Make an effort to limit direct sun exposure during this time. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Portland, AR
- Average high temperature in September: 86°F
The warmest month (with the highest average high temperature) is July (90.7°F).
The month with the lowest average high temperature is January (51.6°F).
- Average low temperature in September: 67.3°F
The month with the highest average low temperature is July (73.6°F).
The coldest month (with the lowest average low temperature) is January (38.1°F).
Average pressure in September
Portland, 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 (29.95"Hg).
Average wind speed in September
Portland, AR
- Average wind speed in September: 6mph
The windiest month (with the highest average wind speed) is February (9.4mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).
Average humidity in September
Portland, AR
- Average humidity in September: 72%
The months with the highest relative humidity are February and March (79%).
The month with the lowest relative humidity is October (67%).
Average rainfall in September
Portland, AR
- Average rainfall in September: 2.72"
The wettest month (with the highest rainfall) is April (4.49").
The driest month (with the least rainfall) is November (2.44").
Average rainfall days in September
Portland, AR
- Average rainfall days in September: 12.8 days
The month with the highest number of rainy days is July (16.7 days).
The month with the least rainy days is October (9.3 days).
Average snowfall in September
Portland, AR
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.43").
The months with the least snowfall are April, May, June, July, August, September, October and December (0").
Average snowfall days in September
Portland, AR
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1.2 days).
The months with the least snowfall days are April, May, June, July, August, September, October and December (0 days).
Average daylight in September /
Average sunshine in September
Portland, AR
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in September: 9h and 54min
The month with the most sunshine is June (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).
Average sunshine days in September
Portland, AR
- Average sunshine days in September: 14.8 days
The month with the most sunshine days is October (19.6 days).
The month with the least sunshine days is July (12 days).
Average UV index in September
Portland, AR
- Average UV index in September: 6
The months with the highest UV index are June, July and August (UV index 7).
The months with the lowest UV index are January and December (UV index 3).
Average cloud cover in September
Portland, AR
- Average cloud cover in September: 27
The month with the most cloud cover is February (Cloud cover 46).
The month with the least cloud cover is June (Cloud cover 25).
Average visibility in September
Portland, 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).
