September weather forecastBlue Grass, IA
September
Weather in September
September, the first month of the autumn in Blue Grass, is still a warm month, with an average temperature ranging between max 75.2°F (24°C) and min 55.8°F (13.2°C).Temperature
Blue Grass notes an average high-temperature of a still moderately hot 75.2°F (24°C) in September, displaying minor variation from August. Throughout September, an average low-temperature of 55.8°F (13.2°C) is expected.Humidity
In Blue Grass, the average relative humidity in September is 76%.Rainfall
In Blue Grass, in September, it is raining for 12.5 days, with typically 2.36" (60mm) of accumulated precipitation. Throughout the year, there are 151.1 rainfall days, and 31.14" (791mm) of precipitation is accumulated.Snowfall
In Blue Grass, snow does not fall in May through September.Daylight
In Blue Grass, the average length of the day in September is 12h and 28min.On the first day of September, sunrise is at 6:30 am and sunset at 7:35 pm. On the last day of the month, sunrise is at 6:59 am and sunset at 6:45 pm CDT.
Sunshine
In Blue Grass, the average sunshine in September is 9.4h.UV index
In Blue Grass, 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 radiation for average individuals.Note: The maximum daily UV index of 4 in September interprets into the following recommendations:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. Always opt for UVA and UVB-resistant sunglasses on radiant days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Blue Grass, IA
- Average high temperature in September: 75.2°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (27.7°F).
- Average low temperature in September: 55.8°F
The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (15.3°F).
Average pressure in September
Blue Grass, 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
Blue Grass, 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
Blue Grass, IA
- Average humidity in September: 76%
The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is October (72%).
Average rainfall in September
Blue Grass, IA
- Average rainfall in September: 2.36"
The wettest month (with the highest rainfall) is May (5").
The driest month (with the least rainfall) is February (1.38").
Average rainfall days in September
Blue Grass, IA
- Average rainfall days in September: 12.5 days
The month with the highest number of rainy days is May (19.6 days).
The month with the least rainy days is January (4.6 days).
Average snowfall in September
Blue Grass, IA
- Average snowfall in September: 0"
The month with the highest snowfall is January (4.88").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Blue Grass, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (11.6 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
Blue Grass, 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 24min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days in September
Blue Grass, IA
- Average sunshine days in September: 15.8 days
The month with the most sunshine days is December (17.4 days).
The months with the least sunshine days are May and June (8.3 days).
Average UV index in September
Blue Grass, IA
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Blue Grass, IA
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 57).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in September
Blue Grass, 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).
