September weather forecastAthelstan, IA
September
Weather in September
September, the first month of the autumn in Athelstan, is also a moderately hot month, with an average temperature varying between 76.1°F (24.5°C) and 56.5°F (13.6°C).Temperature
September witnesses a gentle descent in average high-temperature, descending from August's 82°F (27.8°C) to a still moderately hot 76.1°F (24.5°C). In the month of September, Athelstan witnesses a consistent average low-temperature of 56.5°F (13.6°C).Humidity
The average relative humidity in September is 75%.Rainfall
In September, the rain falls for 11.6 days. Throughout September, 1.85" (47mm) of precipitation is accumulated. Throughout the year, there are 123.8 rainfall days, and 21.93" (557mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall in Athelstan.Daylight
In Athelstan, the average length of the day in September 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
The average sunshine in September is 9.3h.UV index
In Athelstan, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for the ordinary person.Note: An average UV index of 5 in September transforms into this advice:
Undertake protective steps - Obligation to safeguard skin and eyes from harm is in place. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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 24min
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 18min
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).
