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 arrival of September denotes a barely perceptible change in the average high-temperatures to a still moderately hot 76.8°F (24.9°C) from August's 82°F (27.8°C). Throughout the month of September, Missouri Valley sees a steady low-temperature average of 56.5°F (13.6°C).Humidity
In Missouri Valley, the average relative humidity in September is 72%.Rainfall
In Missouri Valley, during September, the rain falls for 10.7 days and regularly aggregates up to 1.38" (35mm) of precipitation. In Missouri Valley, during the entire year, the rain falls for 108.1 days and collects up to 16.1" (409mm) of precipitation.Snowfall
May through September are months without snowfall in Missouri Valley.Daylight
In September, the average length of the day is 12h and 28min.On the first day of September, sunrise is at 6:50 am and sunset at 7:56 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 7:06 pm CDT.
Sunshine
In Missouri Valley, the average sunshine in September is 9.1h.UV index
The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for average individuals.Note: A typical high UV index of 4 in September suggests the following recommendations:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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 September?
What is the average length of the day in September?
What time are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index reading in September?
Average temperature in September
Missouri Valley, IA
- Average high temperature in September: 76.8°F
The warmest month (with the highest average high temperature) is July (84.2°F).
The month with the lowest average high temperature is January (28.9°F).
- Average low temperature in September: 56.5°F
The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is January (15.3°F).
Average pressure in September
Missouri Valley, IA
- Average pressure in September: 29.99"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).
Average wind speed in September
Missouri Valley, IA
- Average wind speed in September: 8.5mph
The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest month (with the lowest average wind speed) is July (7.1mph).
Average humidity in September
Missouri Valley, IA
- Average humidity in September: 72%
The month with the highest relative humidity is January (81%).
The month with the lowest relative humidity is October (66%).
Average rainfall in September
Missouri Valley, IA
- Average rainfall in September: 1.38"
The wettest month (with the highest rainfall) is June (2.68").
The driest month (with the least rainfall) is January (0.39").
Average rainfall days in September
Missouri Valley, IA
- Average rainfall days in September: 10.7 days
The month with the highest number of rainy days is May (14.8 days).
The month with the least rainy days is January (2.4 days).
Average snowfall in September
Missouri Valley, IA
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.85").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Missouri Valley, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (7.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Missouri Valley, 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 12min).
- Average sunshine in September: 9h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).
Average sunshine days in September
Missouri Valley, IA
- Average sunshine days in September: 17.5 days
The month with the most sunshine days is December (22.7 days).
The month with the least sunshine days is May (13.1 days).
Average UV index in September
Missouri Valley, IA
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, October, November and December (UV index 2).
Average cloud cover in September
Missouri Valley, IA
- Average cloud cover in September: 28
The month with the most cloud cover is January (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 26).
Average visibility in September
Missouri Valley, 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).
Missouri Valley, Iowa, USA
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