September weather forecastClearfield, IA
September
Weather in September
September, the first month of the autumn in Clearfield, is also a moderately hot month, with an average temperature fluctuating between 76.1°F (24.5°C) and 56.5°F (13.6°C).Temperature
With the arrival of September, Clearfield experiences a modest decline in average high-temperatures, transitioning from a warm 82°F (27.8°C) in August to a still moderately hot 76.1°F (24.5°C). Clearfield experiences an average low-temperature of 56.5°F (13.6°C) in month of September.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
In Clearfield, snow does not fall in June through September.Daylight
The average length of the day in September is 12h and 27min.On the first day of September, sunrise is at 6:45 am and sunset at 7:49 pm. On the last day of the month, 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 Clearfield, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for the average person.Note: In September, the maximum UV index of 5 translates into these guidelines:
Preventative actions are necessary - The mandate to avoid skin and eye damage is in place. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Clearfield, 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
Clearfield, 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
Clearfield, 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
Clearfield, 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
Clearfield, 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
Clearfield, 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
Clearfield, 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
Clearfield, 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
Clearfield, 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 24min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).
Average sunshine days in September
Clearfield, 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
Clearfield, 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
Clearfield, 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
Clearfield, 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).
