September weather forecast
Denmark, IA

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Weather in September

September, the first month of the autumn in Denmark, is still a warm month, with an average temperature varying between 57.4°F (14.1°C) and 77°F (25°C).

Temperature

The arrival of September brings an average high-temperature of a still warm 77°F (25°C), closely following the temperature pattern of August. In Denmark, September nights cool down to an average of 57.4°F (14.1°C).

Humidity

In Denmark, the average relative humidity in September is 74%.

Rainfall

In Denmark, in September, during 8.2 rainfall days, 0.83" (21mm) of precipitation is typically accumulated. Throughout the year, there are 101.8 rainfall days, and 9.92" (252mm) of precipitation is accumulated.

Snowfall

In Denmark, snow does not fall in May through September.

Daylight

The average length of the day in September is 12h and 27min.
On the first day of the month, sunrise is at 6:33 am and sunset at 7:37 pm. On the last day of September, in Denmark, sunrise is at 7:01 am and sunset at 6:48 pm CDT.

Sunshine

In Denmark, Iowa, the average sunshine in September is 9.6h.

UV index

In Denmark, Iowa, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: An average maximum UV index of 4 in September leads to these recommendations:
Undertake precautions - It is suggested to shield oneself from sunburn. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.
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Frequently asked questions

What is the temperature in September in Denmark?

In September, the average high-temperature and low-temperature in Denmark are 77°F (25°C) and 57.4°F (14.1°C) respectively. In August, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which takes the relative humidity and factors it into the air temperature reading, is evaluated at 89.6°F (32°C).

What is the average humidity in September in Denmark?

In September, the average relative humidity in Denmark, Iowa, is 74%.

How much does it rain in Denmark in September?

In September, in Denmark, the rain falls for 8.2 days. Throughout September, 0.83" (21mm) of precipitation is accumulated.

When it does not snow in Denmark?

In Denmark, snow does not fall in May through September.

Does it snow in Denmark in September?

In Denmark, Iowa, in September, it doesn't snow. In October, it regularly snows.

How many hours of daylight does Denmark have in September?

The average day length in September in Denmark is 12h and 27min.

What time are sunrise and sunset in September in Denmark?

In September, on the first day of the month, sunrise is at 6:33 am and sunset at 7:37 pm. On the last day of the month, in Denmark, sunrise is at 7:01 am and sunset at 6:48 pm CDT.

How long on average sun shines in September in Denmark?

In Denmark, the average sunshine duration in September is 9.6h.

What is the UV index reading in September in Denmark?

The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate vulnerability from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Denmark, IA

Average temperature in September - Denmark, IA
  • Average high temperature in September: 77°F

The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (30.4°F).

  • Average low temperature in September: 57.4°F

The month with the highest average low temperature is July (66.2°F).
The coldest month (with the lowest average low temperature) is January (18.5°F).

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Average pressure in September
Denmark, IA

Average pressure in September - Denmark, IA
  • Average pressure in September: 30.02"Hg

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

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Average wind speed in September
Denmark, IA

Average wind speed in September - Denmark, IA
  • Average wind speed in September: 7.7mph

The windiest months (with the highest average wind speed) are January, February, March and April (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.7mph).

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Average humidity in September
Denmark, IA

Average humidity in September - Denmark, IA
  • Average humidity in September: 74%

The month with the highest relative humidity is July (82%).
The month with the lowest relative humidity is October (71%).

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Average rainfall in September
Denmark, IA

Average rainfall in September - Denmark, IA
  • Average rainfall in September: 0.83"

The wettest month (with the highest rainfall) is May (1.46").
The driest months (with the least rainfall) are January and December (0.47").

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Average rainfall days in September
Denmark, IA

Average rainfall days in September - Denmark, IA
  • Average rainfall days in September: 8.2 days

The month with the highest number of rainy days is May (14.4 days).
The month with the least rainy days is February (3.5 days).

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Average snowfall in September
Denmark, IA

Average snowfall in September - Denmark, IA
  • Average snowfall in September: 0"

The month with the highest snowfall is January (1.1").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in September
Denmark, IA

Average snowfall days in September - Denmark, IA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (7.7 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average daylight in September /
Average sunshine in September
Denmark, IA

Average daylight in September / Average sunshine in September - Denmark, IA
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in September: 9h and 4min

The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).

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Average sunshine days in September
Denmark, IA

Average sunshine days in September - Denmark, IA
  • Average sunshine days in September: 19.4 days

The month with the most sunshine days is December (22.9 days).
The month with the least sunshine days is May (14 days).

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Average UV index in September
Denmark, IA

Average UV index in September - Denmark, 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, November and December (UV index 2).

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Average cloud cover in September
Denmark, IA

Average cloud cover in September - Denmark, IA
  • Average cloud cover in September: 28

The month with the most cloud cover is January (Cloud cover 54).
The months with the least cloud cover are July, August and September (Cloud cover 28).

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Average visibility in September
Denmark, IA

Average visibility in September - Denmark, 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).

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Denmark, Iowa, USA

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