September weather forecastLa Porte City, IA
September
Weather in September
September, the first month of the autumn in La Porte City, is still a pleasant month, with an average temperature varying between 73°F (22.8°C) and 54.7°F (12.6°C).Temperature
The beginning of September brings a slight decrease in the average high-temperature, transitioning from a warm 78.8°F (26°C) in August to an agreeable 73°F (22.8°C). La Porte City observes an average nighttime temperature of 54.7°F (12.6°C) during September.Humidity
In La Porte City, the average relative humidity in September is 78%.Rainfall
In September, the rain falls for 10.3 days. Throughout September, 1.34" (34mm) of precipitation is accumulated. In La Porte City, during the entire year, the rain falls for 117.9 days and collects up to 15.63" (397mm) of precipitation.Snowfall
In La Porte City, 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 6:34 am and sunset at 7:42 pm. On the last day of September, sunrise is at 7:05 am and sunset at 6:51 pm CDT.
Sunshine
In La Porte City, the average sunshine in September is 9.2h.UV index
In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.Note: An average UV index of 4 in September transforms into this advice:
Put precautions into practice - Protective measures against sun-induced damage are advised. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
La Porte City, IA
- Average high temperature in September: 73°F
The warmest month (with the highest average high temperature) is July (80.1°F).
The month with the lowest average high temperature is January (25.2°F).
- Average low temperature in September: 54.7°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (12.7°F).
Average pressure in September
La Porte City, 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 (29.89"Hg).
Average wind speed in September
La Porte City, IA
- Average wind speed in September: 8.1mph
The windiest month (with the highest average wind speed) is April (10.8mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).
Average humidity in September
La Porte City, IA
- Average humidity in September: 78%
The month with the highest relative humidity is January (86%).
The month with the lowest relative humidity is October (72%).
Average rainfall in September
La Porte City, IA
- Average rainfall in September: 1.34"
The wettest month (with the highest rainfall) is June (2.52").
The driest month (with the least rainfall) is February (0.43").
Average rainfall days in September
La Porte City, IA
- Average rainfall days in September: 10.3 days
The month with the highest number of rainy days is May (16 days).
The months with the least rainy days are January and February (3.1 days).
Average snowfall in September
La Porte City, IA
- Average snowfall in September: 0"
The months with the highest snowfall are January and February (1.97").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
La Porte City, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (8.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
La Porte City, IA
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 9h and 12min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in September
La Porte City, IA
- Average sunshine days in September: 17.5 days
The month with the most sunshine days is January (21.6 days).
The month with the least sunshine days is June (11.8 days).
Average UV index in September
La Porte City, IA
- Average UV index in September: 4
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
La Porte City, IA
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 59).
The months with the least cloud cover are August and September (Cloud cover 30).
Average visibility in September
La Porte City, 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).
