September weather forecastLynnville, IA
September
Weather in September
September, the first month of the autumn in Lynnville, is still a warm month, with an average temperature fluctuating between 74.7°F (23.7°C) and 55.8°F (13.2°C).Temperature
September brings a slight decrease in temperature, down from 80.2°F (26.8°C) in August to a still moderately hot 74.7°F (23.7°C). Lynnville experiences a mean low-temperature of 55.8°F (13.2°C) during September.Humidity
In Lynnville, the average relative humidity in September is 77%.Rainfall
In Lynnville, in September, during 10.6 rainfall days, 1.26" (32mm) of precipitation is typically accumulated. In Lynnville, during the entire year, the rain falls for 117.5 days and collects up to 13.03" (331mm) of precipitation.Snowfall
In Lynnville, snow does not fall in June through September.Daylight
In Lynnville, the average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 6:38 am and sunset at 7:43 pm. On the last day of September, in Lynnville, sunrise is at 7:07 am and sunset at 6:54 pm CDT.
Sunshine
In September, the average sunshine is 9.5h.UV index
In Lynnville, Iowa, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum daily UV index, 4 in September, converts into the following recommendations:
Take necessary precautions - Protection from skin and eye injury is mandatory. To protect against the Sun's most potent rays, avoid direct exposure around midday. To cut down UV radiation exposure by about half, sport a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Lynnville, IA
- Average high temperature in September: 74.7°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°F).
- Average low temperature in September: 55.8°F
The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is January (13.8°F).
Average pressure in September
Lynnville, 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
Lynnville, IA
- Average wind speed in September: 8.1mph
The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest month (with the lowest average wind speed) is August (7mph).
Average humidity in September
Lynnville, IA
- Average humidity in September: 77%
The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Lynnville, IA
- Average rainfall in September: 1.26"
The wettest months (with the highest rainfall) are May and June (1.97").
The driest month (with the least rainfall) is January (0.47").
Average rainfall days in September
Lynnville, IA
- Average rainfall days in September: 10.6 days
The month with the highest number of rainy days is June (15.1 days).
The month with the least rainy days is February (4.1 days).
Average snowfall in September
Lynnville, 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
Lynnville, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (8.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Lynnville, 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 30min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in September
Lynnville, IA
- Average sunshine days in September: 17.9 days
The month with the most sunshine days is January (21.1 days).
The month with the least sunshine days is June (11.5 days).
Average UV index in September
Lynnville, 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
Lynnville, 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 September (Cloud cover 29).
Average visibility in September
Lynnville, 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).
