September weather forecastDavenport, IA
September
Weather in September
Davenport enters a transitional phase in September, bidding farewell to warm Summer days and welcoming cooler Autumn nights. Although the rainfall is less than the peak levels of Spring, there is a slight increase compared to August. As humidity divides and tempests begin to pick up the pace, the city prepares for a change of season. Outdoor activities should be enjoyed earlier in the day, with the reduction in daylight hours being a noticeable sign of the impending Fall. The UV index dips to 4, alleviating some concern about excessive sun exposure.Temperature
With the arrival of September, Davenport notices a mild change in the average high-temperature, sliding from August's 80.8°F (27.1°C) to a still moderately hot 75.4°F (24.1°C). During September nights, Davenport records an average temperature of 56.3°F (13.5°C).Humidity
In September, the average relative humidity is 76%.Rainfall
In Davenport, in September, it is raining for 11.5 days, with typically 2.05" (52mm) of accumulated precipitation. In Davenport, during the entire year, the rain falls for 138.1 days and collects up to 27.32" (694mm) of precipitation.Snowfall
In Davenport, snow does not fall in May through September.Daylight
In Davenport, the average length of the day in September is 12h and 28min.On the first day of September, sunrise is at 6:29 am and sunset at 7:34 pm. On the last day of the month, sunrise is at 6:58 am and sunset at 6:45 pm CDT.
Sunshine
In Davenport, Iowa, the average sunshine in September is 9.2h.UV index
In Davenport, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: A maximum daily UV index of 4 during September morphs into the following directions:
Undertake precautions - Guarding against sun damage is counselled. Minimize direct exposure to the Sun during midday when its radiation is at its peak. During bright days, sunglasses that offer UVA and UVB defense are recommended.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Davenport, IA
- Average high temperature in September: 75.4°F
The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (28°F).
- Average low temperature in September: 56.3°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (15.6°F).
Average pressure in September
Davenport, IA
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in September
Davenport, IA
- Average wind speed in September: 7.8mph
The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is August (6.7mph).
Average humidity in September
Davenport, IA
- Average humidity in September: 76%
The months with the highest relative humidity are January and July (83%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Davenport, IA
- Average rainfall in September: 2.05"
The wettest month (with the highest rainfall) is May (4.49").
The driest month (with the least rainfall) is February (1.1").
Average rainfall days in September
Davenport, IA
- Average rainfall days in September: 11.5 days
The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is January (4.3 days).
Average snowfall in September
Davenport, IA
- Average snowfall in September: 0"
The month with the highest snowfall is January (3.98").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Davenport, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (10.9 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Davenport, 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 12min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in September
Davenport, IA
- Average sunshine days in September: 17.4 days
The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is May (11.4 days).
Average UV index in September
Davenport, IA
- Average UV index in September: 4
The months with the highest UV index are July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in September
Davenport, IA
- Average cloud cover in September: 31
The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in September
Davenport, 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).
