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
September's onset corresponds with a subtle shift in the average high-temperature, slightly moving from 80.1°F (26.7°C) in August to a still moderately hot 74.1°F (23.4°C). Grand Mound's nighttime temperature in September falls to an average of 55°F (12.8°C).Humidity
The average relative humidity in September in Grand Mound is 77%.Rainfall
In Grand Mound, Iowa, during September, the rain falls for 11.2 days and regularly aggregates up to 2.28" (58mm) of precipitation. In Grand Mound, during the entire year, the rain falls for 142.1 days and collects up to 28.35" (720mm) of precipitation.Snowfall
May through September are months without snowfall in Grand Mound.Daylight
The average length of the day in September in Grand Mound is 12h and 28min.On the first day of the month, sunrise is at 6:29 am and sunset at 7:35 pm. On the last day of September, in Grand Mound, sunrise is at 6:59 am and sunset at 6:45 pm CDT.
Sunshine
In Grand Mound, the average sunshine in September is 9.2h.UV index
In September, the average daily maximum UV index in Grand Mound, Iowa, is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for average individuals.Note: The daily maximum UV index of 4 in September interprets into the following advice:
Undertake protective steps - Preventing sun damage is advised. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
Frequently asked questions
What is the usual temperature for Grand Mound in September?
What is the average humidity in September in Grand Mound?
How much does it rain in Grand Mound in September?
When it does not snow in Grand Mound?
Does it snow in Grand Mound in September?
What is the average length of the day in September in Grand Mound?
When are sunrise and sunset in September in Grand Mound?
How long on average sun shines in September in Grand Mound?
What is the UV index intensity in September in Grand Mound?
Average temperature in September
Grand Mound, IA
- Average high temperature in September: 74.1°F
The warmest month (with the highest average high temperature) is July (80.4°F).
The month with the lowest average high temperature is January (26.6°F).
- Average low temperature in September: 55°F
The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (14.4°F).
Average pressure in September
Grand Mound, 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
Grand Mound, IA
- Average wind speed in September: 7.7mph
The windiest month (with the highest average wind speed) is April (10.5mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).
Average humidity in September
Grand Mound, IA
- Average humidity in September: 77%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is October (73%).
Average rainfall in September
Grand Mound, IA
- Average rainfall in September: 2.28"
The wettest month (with the highest rainfall) is May (4.61").
The driest month (with the least rainfall) is February (1.26").
Average rainfall days in September
Grand Mound, IA
- Average rainfall days in September: 11.2 days
The month with the highest number of rainy days is May (18.2 days).
The month with the least rainy days is February (5.3 days).
Average snowfall in September
Grand Mound, IA
- Average snowfall in September: 0"
The month with the highest snowfall is January (5.2").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Grand Mound, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (11.5 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
Grand Mound, IA
- Average daylight in September: 12h and 3min
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 12min).
- Average sunshine in September: 9h and 1min
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
Grand Mound, IA
- Average sunshine days in September: 17.1 days
The month with the most sunshine days is November (17.5 days).
The month with the least sunshine days is May (10.7 days).
Average UV index in September
Grand Mound, IA
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in September
Grand Mound, 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
Grand Mound, IA
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January and July (5mi).
Grand Mound, Iowa, USA
Weather forecast for your location
2. Allow the app to use your location
