September weather forecastPella, IA
September
Weather in September
September acts as the transition gate from the heat of summer to the crispness of fall. Gradual cooling begins from the high temperatures of August, making mid-day heat more tolerable. The decrease in temperature is complemented by trimming daylight hours and less intensive UV radiation. Nestled between the major seasons, September showcases the best of both worlds. It combines pleasant warmth from lingering summer days with cool evenings, hinting at the upcoming fall.Temperature
Pella's transition into September involves a gentle shift in temperature, receding from a moderately hot 81.3°F (27.4°C) in August to a still warm 75.7°F (24.3°C). Pella experiences an average low-temperature of 56.1°F (13.4°C) in the month of September.Humidity
The average relative humidity in September is 77%.Rainfall
In Pella, in September, it is raining for 9.6 days, with typically 1.34" (34mm) of accumulated precipitation. In Pella, during the entire year, the rain falls for 109.6 days and collects up to 12.28" (312mm) of precipitation.Snowfall
In Pella, snow does not fall in June through September.Daylight
In September, the average length of the day is 12h and 28min.On the first day of the month, sunrise is at 6:38 am and sunset at 7:44 pm. On the last day of September, sunrise is at 7:08 am and sunset at 6:54 pm CDT.
Sunshine
The average sunshine in September is 9.2h.UV index
In Pella, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for average individuals.Note: An average UV index of 4 in September transforms into this advice:
Exercise prevention - Precautions against solar damage are endorsed. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Pella, IA
- Average high temperature in September: 75.7°F
The warmest month (with the highest average high temperature) is July (82.2°F).
The month with the lowest average high temperature is January (28°F).
- Average low temperature in September: 56.1°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
Pella, IA
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in September
Pella, IA
- Average wind speed in September: 8mph
The windiest months (with the highest average wind speed) are March and April (10.4mph).
The calmest month (with the lowest average wind speed) is August (6.9mph).
Average humidity in September
Pella, IA
- Average humidity in September: 77%
The months with the highest relative humidity are January, February, June and July (82%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Pella, IA
- Average rainfall in September: 1.34"
The wettest month (with the highest rainfall) is May (2.09").
The driest months (with the least rainfall) are January and February (0.43").
Average rainfall days in September
Pella, IA
- Average rainfall days in September: 9.6 days
The month with the highest number of rainy days is May (14.3 days).
The month with the least rainy days is February (3.3 days).
Average snowfall in September
Pella, IA
- Average snowfall in September: 0"
The month with the highest snowfall is January (1.81").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Pella, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (7.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Pella, 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 12min).
- Average sunshine in September: 9h and 12min
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 12min).
Average sunshine days in September
Pella, IA
- Average sunshine days in September: 18.1 days
The month with the most sunshine days is December (21.9 days).
The month with the least sunshine days is June (12.4 days).
Average UV index in September
Pella, IA
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in September
Pella, IA
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 55).
The months with the least cloud cover are July and September (Cloud cover 30).
Average visibility in September
Pella, IA
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
