Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
The shift to September signals an average high-temperature of a still moderately hot 76.1°F (24.5°C), subtly varied from August's 81.1°F (27.3°C). An average low-temperature of 56.3°F (13.5°C) is recorded during the nights in September.Humidity
In September, the average relative humidity in Oakville is 75%.Rainfall
In September, the rain falls for 11.8 days. Throughout September, 2.44" (62mm) of precipitation is accumulated. Throughout the year, there are 146.3 rainfall days, and 30.31" (770mm) of precipitation is accumulated.Snowfall
May through September are months without snowfall.Daylight
In Oakville, the average length of the day in September is 12h and 27min.On the first day of September, sunrise is at 6:31 am and sunset at 7:36 pm. On the last day of the month, sunrise is at 7:00 am and sunset at 6:47 pm CDT.
Sunshine
In Oakville, the average sunshine in September is 9.5h.UV index
The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for average individuals.Note: In September, the maximum UV index of 4 translates into these guidelines:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. To avoid the Sun's strongest rays, limit exposure around the mid-day period. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
Does it snow in Oakville in September?
How many hours of daylight does Oakville have in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Oakville have in September?
What is the UV index reading in September?
Average temperature in September
Oakville, IA
- Average high temperature in September: 76.1°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (28.9°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 (16.7°F).
Average pressure in September
Oakville, IA
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in September
Oakville, IA
- Average wind speed in September: 7.8mph
The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest months (with the lowest average wind speed) are July and August (6.8mph).
Average humidity in September
Oakville, IA
- Average humidity in September: 75%
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Oakville, IA
- Average rainfall in September: 2.44"
The wettest month (with the highest rainfall) is May (4.65").
The driest month (with the least rainfall) is December (1.42").
Average rainfall days in September
Oakville, IA
- Average rainfall days in September: 11.8 days
The month with the highest number of rainy days is May (18.8 days).
The month with the least rainy days is January (5.3 days).
Average snowfall in September
Oakville, IA
- Average snowfall in September: 0"
The month with the highest snowfall is January (4.49").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Oakville, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (10.1 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
Oakville, IA
- Average daylight in September: 12h and 3min
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 3min
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 18min).
Average sunshine days in September
Oakville, IA
- Average sunshine days in September: 16.4 days
The month with the most sunshine days is October (18.4 days).
The month with the least sunshine days is June (8.4 days).
Average UV index in September
Oakville, 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
Oakville, IA
- Average cloud cover in September: 29
The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in September
Oakville, 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).
Oakville, Iowa, USA
Weather forecast for your location
2. Allow the app to use your location