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
September
Weather in September
Temperature
Transition into September subtly marks a drop in the average high-temperature, moderately moving from a hot 88°F (31.1°C) in August to a warm 81.1°F (27.3°C). Alpena's nights in September experience an average temperature drop to a moderate 59.7°F (15.4°C).Heat index
In September, the average heat index is estimated at a hot 86°F (30°C). Uninterrupted activity during exposure could lead to a sense of exhaustion, possibly causing heat cramps.Evaluating the heat index requires understanding its values in the shade and with gentle winds. The heat index has the potential to rise by 15 Fahrenheit (8 Celsius) degrees with direct sunshine exposure.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is the result of factoring in humidity to the air temperature, indicating perceived warmth. Physical activity, clothing, and metabolic variations are additional factors that impact an individual's perception of temperature. When exposed to direct sunlight, it's possible for the heat index to increase by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. Juveniles are regularly less conscious of the need to recuperate and rehydrate. Thirst is a tardy symptom of dehydration - hydration, especially during lengthy physical activities, should be maintained.
Humidity
In September, the average relative humidity is 75%.Rainfall
In Alpena, in September, during 13.4 rainfall days, 2.09" (53mm) of precipitation is typically accumulated. In Alpena, during the entire year, the rain falls for 145.5 days and collects up to 31.89" (810mm) of precipitation.Snowfall
In Alpena, snow does not fall in June through October.Daylight
In September, the average length of the day is 12h and 24min.On the first day of September, sunrise is at 6:45 am and sunset at 7:40 pm. On the last day of the month, sunrise is at 7:08 am and sunset at 6:57 pm CDT.
Sunshine
In September, the average sunshine is 9.2h.UV index
In September, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the ordinary person.Note: In September, the maximum UV index of 5 transforms into these recommendations:
Be vigilant - Preventing sunburn is recommended. Direct Sun exposure should be minimized especially during midday when radiation is most intense. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature?
What is the average humidity in September in Alpena?
How much does it rain in September?
When it does not snow in Alpena?
How many hours of daylight does Alpena have in September?
When is the sunrise / sunset in September?
How many hours of sunshine does Alpena have in September?
What is the UV index intensity in September?
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).