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 shift into September uncovers an average high-temperature of a still moderately hot 73.6°F (23.1°C), subtly different from the previous month. In the month of September, an average of 54.5°F (12.5°C) marks the low-temperature.Humidity
In September, the average relative humidity is 74%.Rainfall
In September, the rain falls for 11.6 days. Throughout September, 2.17" (55mm) of precipitation is accumulated. Throughout the year, there are 127.3 rainfall days, and 23.58" (599mm) of precipitation is accumulated.Snowfall
In Mallard, snow does not fall in June through September.Daylight
In September, the average length of the day is 12h and 29min.On the first day of the month, sunrise is at 6:44 am and sunset at 7:52 pm. On the last day of September, sunrise is at 7:15 am and sunset at 7:01 pm CDT.
Sunshine
In September, the average sunshine is 9h.UV index
The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: A maximum high daily UV index of 4 during September translates into the following directions:
Undertake precautions - It is suggested to shield oneself from sunburn. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. Employ a wide-brim hat for potent defense against up to 50% of UV rays.
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?
When are sunrise and sunset in September in Mallard?
How long on average sun shines in September?
What is the UV index reading in September?
Average temperature in September
Mallard, IA
- Average high temperature in September: 73.6°F
The warmest month (with the highest average high temperature) is July (80.6°F).
The month with the lowest average high temperature is January (24.3°F).
- Average low temperature in September: 54.5°F
The month with the highest average low temperature is July (63.7°F).
The coldest month (with the lowest average low temperature) is January (11.7°F).
Average pressure in September
Mallard, IA
- Average pressure in September: 30"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in September
Mallard, IA
- Average wind speed in September: 8.8mph
The windiest months (with the highest average wind speed) are January and April (11.1mph).
The calmest month (with the lowest average wind speed) is July (7.5mph).
Average humidity in September
Mallard, IA
- Average humidity in September: 74%
The month with the highest relative humidity is January (86%).
The months with the lowest relative humidity are April and October (68%).
Average rainfall in September
Mallard, IA
- Average rainfall in September: 2.17"
The wettest month (with the highest rainfall) is June (3.66").
The driest month (with the least rainfall) is January (0.87").
Average rainfall days in September
Mallard, IA
- Average rainfall days in September: 11.6 days
The month with the highest number of rainy days is June (18.3 days).
The month with the least rainy days is February (2.8 days).
Average snowfall in September
Mallard, IA
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.96").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Mallard, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (11.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Mallard, IA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 9h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in September
Mallard, IA
- Average sunshine days in September: 16.1 days
The month with the most sunshine days is November (19 days).
The month with the least sunshine days is June (9.6 days).
Average UV index in September
Mallard, 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 February (UV index 1).
Average cloud cover in September
Mallard, IA
- Average cloud cover in September: 31
The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility in September
Mallard, IA
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Mallard, Iowa, USA
Weather forecast for your location
2. Allow the app to use your location