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
A subtle shift in Denver's weather is observed as August turns into September, with the average high temperature reducing from a moderately hot 78.4°F (25.8°C) to an agreeable 72.9°F (22.7°C). The low-temperature average for Denver during September stands at a cool 54°F (12.2°C).Humidity
The average relative humidity in September in Denver, Iowa, is 78%.Rainfall
In Denver, in September, it is raining for 11.5 days, with typically 2.36" (60mm) of accumulated precipitation. In Denver, during the entire year, the rain falls for 132 days and collects up to 27.28" (693mm) of precipitation.Snowfall
In Denver, snow does not fall in June through September.Daylight
In Denver, the average length of the day in September is 12h and 29min.On the first day of the month, sunrise is at 6:35 am and sunset at 7:43 pm. On the last day of September, sunrise is at 7:06 am and sunset at 6:51 pm CDT.
Sunshine
The average sunshine in September is 9.2h.UV index
In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for average individuals.Note: The daily high UV index of 4 during September translates into the following recommendations:
Exercise caution. Those with pale skin may experience burns in less than half an hour. Minimize direct exposure to the Sun during midday when its radiation is at its peak. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature in Denver?
What is the average humidity in September in Denver?
How many days does it rain in September in Denver?
When it does not snow in Denver?
Does it snow in Denver in September?
What is the average length of the day in September in Denver?
When is the sunrise / sunset in September in Denver?
How many hours of sunshine does Denver have in September?
What is the UV index reading in September in Denver?
Average temperature in September
Denver, IA
- Average high temperature in September: 72.9°F
The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is January (23.9°F).
- Average low temperature in September: 54°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (11.3°F).
Average pressure in September
Denver, 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
Denver, IA
- Average wind speed in September: 8.2mph
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
Denver, IA
- Average humidity in September: 78%
The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is October (72%).
Average rainfall in September
Denver, IA
- Average rainfall in September: 2.36"
The wettest month (with the highest rainfall) is June (4.09").
The driest month (with the least rainfall) is January (0.98").
Average rainfall days in September
Denver, IA
- Average rainfall days in September: 11.5 days
The month with the highest number of rainy days is June (17.6 days).
The month with the least rainy days is January (3.9 days).
Average snowfall in September
Denver, IA
- Average snowfall in September: 0"
The month with the highest snowfall is January (4.45").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Denver, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (11.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Denver, 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 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 48min).
Average sunshine days in September
Denver, IA
- Average sunshine days in September: 16.9 days
The months with the most sunshine days are October, November and December (17.5 days).
The month with the least sunshine days is June (10.8 days).
Average UV index in September
Denver, 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
Denver, IA
- Average cloud cover in September: 31
The month with the most cloud cover is January (Cloud cover 60).
The months with the least cloud cover are August and September (Cloud cover 31).
Average visibility in September
Denver, IA
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, July and August (5mi).
Denver, Iowa, USA
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