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
A mild shift in the average high-temperature occurs in September, reducing from a moderately hot 82.8°F (28.2°C) in August to a still warm 76.5°F (24.7°C). During the month of September, the temperature in Mount Sterling generally drops to a low average of 57.4°F (14.1°C).Humidity
In September, the average relative humidity in Mount Sterling, Iowa, is 75%.Rainfall
In Mount Sterling, in September, during 10.7 rainfall days, 2.44" (62mm) of precipitation is typically accumulated. In Mount Sterling, during the entire year, the rain falls for 136.6 days and collects up to 28.5" (724mm) of precipitation.Snowfall
May through September are months without snowfall in Mount Sterling.Daylight
In Mount Sterling, the average length of the day in September is 12h and 27min.On the first day of September in Mount Sterling, Iowa, sunrise is at 6:35 am and sunset at 7:39 pm. On the last day of the month, sunrise is at 7:03 am and sunset at 6:50 pm CDT.
Sunshine
The average sunshine in September is 9.4h.UV index
In Mount Sterling, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: A maximum UV index of 4 in September translates into the following recommendations:
Exercise prevention - Precautions against solar damage are endorsed. It's recommended to limit sun exposure when its radiation is at its peak during midday. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
Frequently asked questions
What are the temperatures in Mount Sterling in September?
What is the average humidity in September in Mount Sterling?
How much does it rain in Mount Sterling in September?
When it does not snow in Mount Sterling?
Does it snow in Mount Sterling in September?
What is the average length of the day in September in Mount Sterling?
When is the sunrise / sunset in September in Mount Sterling?
How many hours of sunshine does Mount Sterling have in September?
How high is the UV index in September in Mount Sterling?
Average temperature in September
Mount Sterling, IA
- Average high temperature in September: 76.5°F
The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is January (31.3°F).
- Average low temperature in September: 57.4°F
The month with the highest average low temperature is July (66.4°F).
The coldest month (with the lowest average low temperature) is January (18.3°F).
Average pressure in September
Mount Sterling, IA
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in September
Mount Sterling, IA
- Average wind speed in September: 7.8mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (6.9mph).
Average humidity in September
Mount Sterling, IA
- Average humidity in September: 75%
The month with the highest relative humidity is June (82%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Mount Sterling, IA
- Average rainfall in September: 2.44"
The wettest month (with the highest rainfall) is June (4.09").
The driest month (with the least rainfall) is January (1.14").
Average rainfall days in September
Mount Sterling, IA
- Average rainfall days in September: 10.7 days
The month with the highest number of rainy days is June (17.9 days).
The month with the least rainy days is January (4.8 days).
Average snowfall in September
Mount Sterling, IA
- Average snowfall in September: 0"
The month with the highest snowfall is January (4.09").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Mount Sterling, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (7.5 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Mount Sterling, IA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in September: 9h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).
Average sunshine days in September
Mount Sterling, IA
- Average sunshine days in September: 16.6 days
The month with the most sunshine days is December (19.7 days).
The month with the least sunshine days is May (10.3 days).
Average UV index in September
Mount Sterling, IA
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Mount Sterling, IA
- Average cloud cover in September: 29
The month with the most cloud cover is January (Cloud cover 53).
The months with the least cloud cover are July, August and September (Cloud cover 29).
Average visibility in September
Mount Sterling, IA
- 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).
Mount Sterling, Iowa, USA
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