September weather forecastWinterset, IA
September
Weather in September
September announces the arrival of fall in Winterset as the summer's warmth begins to ebb. Temperatures range from 55.9°F (13.3°C) to 75.4°F (24.1°C), replacing the summer heat with cooler, more relieving weather. Rainfall preserves its trend from August, with little change experienced. The golden and copper hues that paint the town signal the onset of fall, making September a charming time to visit Winterset. As the evenings start to become longer, the city immerses itself in spectacular sunsets and refreshing autumn breezes.Temperature
September indicates a minor shift in the average high-temperature, from August's 81.5°F (27.5°C) to a still moderately hot 75.4°F (24.1°C). An average low-temperature of 55.9°F (13.3°C) marks the nights throughout September.Humidity
The average relative humidity in September in Winterset is 76%.Rainfall
In Winterset, during September, the rain falls for 12.5 days and regularly aggregates up to 2.44" (62mm) of precipitation. In Winterset, during the entire year, the rain falls for 133 days and collects up to 26.14" (664mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
In September, the average length of the day in Winterset is 12h and 28min.On the first day of the month, sunrise is at 6:43 am and sunset at 7:48 pm. On the last day of September, in Winterset, sunrise is at 7:12 am and sunset at 6:59 pm CDT.
Sunshine
In Winterset, the average sunshine in September 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 unprotected exposure to Sun's UV rays for the average person.Note: A typical high UV index of 4 in September suggests the following recommendations:
Heed the precautions - Protecting the skin and eyes from damage is compulsory. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Winterset, IA
- Average high temperature in September: 75.4°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 (28.8°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 (15.3°F).
Average pressure in September
Winterset, 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
Winterset, IA
- Average wind speed in September: 8.1mph
The windiest month (with the highest average wind speed) is January (10.6mph).
The calmest month (with the lowest average wind speed) is August (7mph).
Average humidity in September
Winterset, 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 (71%).
Average rainfall in September
Winterset, IA
- Average rainfall in September: 2.44"
The wettest month (with the highest rainfall) is May (3.98").
The driest month (with the least rainfall) is January (0.91").
Average rainfall days in September
Winterset, IA
- Average rainfall days in September: 12.5 days
The month with the highest number of rainy days is June (17.9 days).
The months with the least rainy days are January and February (3.8 days).
Average snowfall in September
Winterset, IA
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.53").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Winterset, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (9.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Winterset, 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 18min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).
Average sunshine days in September
Winterset, IA
- Average sunshine days in September: 15.9 days
The month with the most sunshine days is November (20.2 days).
The month with the least sunshine days is June (9.8 days).
Average UV index in September
Winterset, 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, October, November and December (UV index 2).
Average cloud cover in September
Winterset, IA
- Average cloud cover in September: 29
The month with the most cloud cover is January (Cloud cover 52).
The months with the least cloud cover are July and September (Cloud cover 29).
Average visibility in September
Winterset, 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).
