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's onset corresponds with a subtle shift in the average high-temperature, slightly moving from a tropical 88°F (31.1°C) in August to a warm 81.1°F (27.3°C). Alpena's average low-temperature for the month of September records at a mild 59.7°F (15.4°C).Heat index
The heat index value during September is calculated to be a tropical 86°F (30°C). Persisting in activity during exposure could lead to weariness and subsequently to heat cramps.Heat index's context suggests values are appropriate for shady areas and slight breezes. Facing direct sunlight may hike up the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. A person's impression of weather can be swayed by numerous aspects, among them metabolic variations, pregnancy, and activity levels. With the sun shining directly, it's crucial to understand that it can increase the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Young children are more at risk than adults since they tend to sweat less. Moreover, their large skin surface in proportion to their small bodies and the high heat production due to their activities contribute to their vulnerability.
Humidity
In Alpena, the average relative humidity in September is 75%.Rainfall
In Alpena, in September, it is raining for 13.4 days, with typically 2.09" (53mm) of accumulated precipitation. In Alpena, during the entire year, the rain falls for 145.5 days and collects up to 31.89" (810mm) of precipitation.Snowfall
June through October are months without snowfall.Daylight
The average length of the day in September is 12h and 24min.On the first day of the month, sunrise is at 6:45 am and sunset at 7:40 pm. On the last day of September, in Alpena, Arkansas, sunrise is at 7:08 am and sunset at 6:57 pm CDT.
Sunshine
The average sunshine in September is 9.2h.UV index
In September, the average daily maximum UV index in Alpena is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for the ordinary person.Note: In September, the average maximum UV index of 5 translates into the following recommendations:
Take care. Persons with lighter skin might suffer burns in less than 30 minutes. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.
Frequently asked questions
What are the temperatures in Alpena in September?
What is the average humidity in September in Alpena?
How many days does it rain in September in Alpena?
When it does not snow in Alpena?
How many hours of daylight does Alpena have in September?
When is the sunrise / sunset in September in Alpena?
How long on average sun shines in September in Alpena?
What is the UV index intensity in September in Alpena?
Average temperature in September
Alpena, AR
- Average high temperature in September: 81.1°F
The warmest month (with the highest average high temperature) is July (89.2°F).
The month with the lowest average high temperature is January (44.2°F).
- Average low temperature in September: 59.7°F
The month with the highest average low temperature is July (67.8°F).
The coldest month (with the lowest average low temperature) is January (28.6°F).
Average pressure in September
Alpena, AR
- Average pressure in September: 30.02"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
Alpena, AR
- Average wind speed in September: 5.2mph
The windiest month (with the highest average wind speed) is April (8mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in September
Alpena, AR
- Average humidity in September: 75%
The months with the highest relative humidity are March and May (78%).
The months with the lowest relative humidity are January and October (73%).
Average rainfall in September
Alpena, AR
- Average rainfall in September: 2.09"
The wettest month (with the highest rainfall) is May (3.94").
The driest months (with the least rainfall) are January and February (1.97").
Average rainfall days in September
Alpena, AR
- Average rainfall days in September: 13.4 days
The month with the highest number of rainy days is July (16.8 days).
The month with the least rainy days is December (7.5 days).
Average snowfall in September
Alpena, AR
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.36").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in September
Alpena, AR
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (4.2 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Alpena, AR
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in September: 9h and 1min
The month with the most sunshine is June (Average sunshine: 10h and 48min).
The months with the least sunshine are January, February and December (Average sunshine: 5h and 30min).
Average sunshine days in September
Alpena, AR
- Average sunshine days in September: 14.5 days
The month with the most sunshine days is December (21.3 days).
The month with the least sunshine days is July (11.4 days).
Average UV index in September
Alpena, AR
- Average UV index in September: 5
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover in September
Alpena, AR
- Average cloud cover in September: 30
The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is June (Cloud cover 27).
Average visibility in September
Alpena, AR
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).
Alpena, Arkansas, USA
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