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 moderate decline in average high-temperatures is noted in September, moving from 82°F (27.8°C) in August to a still moderately hot 76.1°F (24.5°C). In the month of September, the average low-temperature usually rests at a mild 56.5°F (13.6°C).Humidity
The average relative humidity in September is 75%.Rainfall
In Athelstan, during September, the rain falls for 11.6 days and regularly aggregates up to 1.85" (47mm) of precipitation. Throughout the year, there are 123.8 rainfall days, and 21.93" (557mm) of precipitation is accumulated.Snowfall
In Athelstan, snow does not fall in June through September.Daylight
In September, the average length of the day is 12h and 27min.On the first day of the month, sunrise is at 6:46 am and sunset at 7:49 pm. On the last day of September, sunrise is at 7:14 am and sunset at 7:01 pm CDT.
Sunshine
In Athelstan, the average sunshine in September is 9.3h.UV index
In September, the average daily maximum UV index in Athelstan is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for the ordinary person.Note: The maximum UV index of 5 during September translates into these guidelines:
Be mindful. Individuals with a lighter skin tone may suffer burns in less than 30 minutes. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
Frequently asked questions
What is the temperature in September in Athelstan?
What is the average humidity in September in Athelstan?
How much does it rain in Athelstan in September?
When it does not snow in Athelstan?
Does it snow in Athelstan in September?
How many hours of daylight does Athelstan have in September?
What time are sunrise and sunset in September in Athelstan?
How many hours of sunshine does Athelstan have in September?
How high is the UV index in September in Athelstan?
Average temperature in September
Athelstan, IA
- Average high temperature in September: 76.1°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (30.7°F).
- Average low temperature in September: 56.5°F
The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is January (17.1°F).
Average pressure in September
Athelstan, IA
- 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 (29.88"Hg).
Average wind speed in September
Athelstan, IA
- Average wind speed in September: 7.9mph
The windiest month (with the highest average wind speed) is March (10.3mph).
The calmest month (with the lowest average wind speed) is July (6.7mph).
Average humidity in September
Athelstan, IA
- Average humidity in September: 75%
The month with the highest relative humidity is June (81%).
The month with the lowest relative humidity is October (70%).
Average rainfall in September
Athelstan, IA
- Average rainfall in September: 1.85"
The wettest month (with the highest rainfall) is June (3.78").
The driest month (with the least rainfall) is February (0.63").
Average rainfall days in September
Athelstan, IA
- Average rainfall days in September: 11.6 days
The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is January (3.9 days).
Average snowfall in September
Athelstan, IA
- Average snowfall in September: 0"
The month with the highest snowfall is January (3.15").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Athelstan, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (8.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Athelstan, 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 36min).
Average sunshine days in September
Athelstan, IA
- Average sunshine days in September: 16.6 days
The month with the most sunshine days is November (21.9 days).
The month with the least sunshine days is May (11.1 days).
Average UV index in September
Athelstan, IA
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in September
Athelstan, IA
- Average cloud cover in September: 28
The month with the most cloud cover is January (Cloud cover 49).
The months with the least cloud cover are July and September (Cloud cover 28).
Average visibility in September
Athelstan, 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).
Athelstan, Iowa, USA
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