September weather forecastFontanelle, IA
September
Weather in September
The first month of the autumn, September, is still a warm month in Fontanelle, Iowa, with an average temperature fluctuating between 74.8°F (23.8°C) and 55.9°F (13.3°C).Temperature
Fontanelle, Iowa, in September undergoes a slight reduction in the average high-temperature, shifting from August's warm 80.8°F (27.1°C) to a still moderately hot 74.8°F (23.8°C). Fontanelle's average low-temperature in September is measured at a moderate 55.9°F (13.3°C).Humidity
In Fontanelle, the average relative humidity in September is 76%.Rainfall
In Fontanelle, in September, it is raining for 12.7 days, with typically 2.68" (68mm) of accumulated precipitation. In Fontanelle, during the entire year, the rain falls for 138.2 days and collects up to 28.23" (717mm) of precipitation.Snowfall
In Fontanelle, snow does not fall in June through September.Daylight
The average length of the day in September is 12h and 28min.On the first day of September, sunrise is at 6:45 am and sunset at 7:50 pm. On the last day of the month, sunrise is at 7:14 am and sunset at 7:01 pm CDT.
Sunshine
In September, the average sunshine in Fontanelle is 9.3h.UV index
The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for average individuals.Note: A typical high UV index of 4 in September suggests the following recommendations:
Ensure safety - Sun damage prevention is strongly urged. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Fontanelle, IA
- Average high temperature in September: 74.8°F
The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (28.4°F).
- Average low temperature in September: 55.9°F
The month with the highest average low temperature is July (65.1°F).
The coldest month (with the lowest average low temperature) is January (14.9°F).
Average pressure in September
Fontanelle, IA
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in September
Fontanelle, IA
- Average wind speed in September: 8.3mph
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 (7.1mph).
Average humidity in September
Fontanelle, IA
- Average humidity in September: 76%
The months with the highest relative humidity are January, February and June (82%).
The month with the lowest relative humidity is October (70%).
Average rainfall in September
Fontanelle, IA
- Average rainfall in September: 2.68"
The wettest month (with the highest rainfall) is June (4.49").
The driest month (with the least rainfall) is January (0.87").
Average rainfall days in September
Fontanelle, IA
- Average rainfall days in September: 12.7 days
The month with the highest number of rainy days is June (18.5 days).
The month with the least rainy days is January (4 days).
Average snowfall in September
Fontanelle, IA
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.41").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Fontanelle, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (9.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Fontanelle, IA
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 6min).
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 12min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).
Average sunshine days in September
Fontanelle, IA
- Average sunshine days in September: 15.6 days
The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is June (9.6 days).
Average UV index in September
Fontanelle, IA
- Average UV index in September: 4
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
Fontanelle, IA
- Average cloud cover in September: 29
The month with the most cloud cover is January (Cloud cover 53).
The month with the least cloud cover is September (Cloud cover 29).
Average visibility in September
Fontanelle, IA
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
