September weather forecast
Alleman, IA

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Weather in September

September, the first month of the autumn in Alleman, is also a moderately hot month, with an average temperature ranging between max 74.8°F (23.8°C) and min 55.9°F (13.3°C).

Temperature

September's onset introduces a mild reduction in the average high-temperature, from a warm 80.2°F (26.8°C) in August to a still moderately hot 74.8°F (23.8°C). Alleman records an average nighttime low of 55.9°F (13.3°C) in September.

Humidity

The average relative humidity in September in Alleman is 76%.

Rainfall

In Alleman, in September, it is raining for 11.9 days, with typically 3.11" (79mm) of accumulated precipitation. In Alleman, during the entire year, the rain falls for 141.4 days and collects up to 29.65" (753mm) of precipitation.

Snowfall

June through September are months without snowfall.

Daylight

The average length of the day in September in Alleman, Iowa, is 12h and 28min.
On the first day of September in Alleman, sunrise is at 6:41 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 7:11 am and sunset at 6:57 pm CDT.

Sunshine

In Alleman, Iowa, the average sunshine in September is 9.3h.

UV index

In Alleman, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for the average person.
Note: In September, a daily maximum UV index of 4 leads to the following instructions:
Prioritize safety - Suggestions to prevent sun damage are offered. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Experience reduced UV exposure by about half when donning a wide-brim hat.
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Frequently asked questions

What are the temperatures in Alleman in September?

The high-temperature, in September, in Alleman, is 74.8°F (23.8°C), while the low-temperature averages to 55.9°F (13.3°C). The average heat index (a.k.a. 'apparent temperature', 'real feel'), which calculates the temperature value influenced by the moisture in the air, in July is evaluated at 89.6°F (32°C).

What is the average humidity in September in Alleman?

In September, the average relative humidity in Alleman, Iowa, is 76%.

How much does it rain in Alleman in September?

In Alleman, in September, it is raining for 11.9 days, with typically 3.11" (79mm) of accumulated precipitation.

When it does not snow in Alleman?

In Alleman, Iowa, snow does not fall in June through September.

Does it snow in Alleman in September?

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

What is the average length of the day in September in Alleman?

In Alleman, the average day length in September is 12h and 28min.

What time are sunrise and sunset in September in Alleman?

On the first day of September in Alleman, Iowa, sunrise is at 6:41 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 7:11 am and sunset at 6:57 pm CDT.

How long on average sun shines in September in Alleman?

In Alleman, Iowa, the average sunshine duration in September is 9.3h.

How high is the UV index in September in Alleman?

The average daily maximum UV index in September in Alleman, Iowa, is 4. A UV Index of 3 to 5 symbolizes a medium hazard to health 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
Alleman, IA

Average temperature in September - Alleman, IA
  • Average high temperature in September: 74.8°F

The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (26.6°F).

  • Average low temperature in September: 55.9°F

The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is January (13.6°F).

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Average pressure in September
Alleman, IA

Average pressure in September - Alleman, IA
  • Average pressure in September: 30.01"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).

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Average wind speed in September
Alleman, IA

Average wind speed in September - Alleman, IA
  • Average wind speed in September: 8.1mph

The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).

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Average humidity in September
Alleman, IA

Average humidity in September - Alleman, IA
  • Average humidity in September: 76%

The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is October (70%).

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Average rainfall in September
Alleman, IA

Average rainfall in September - Alleman, IA
  • Average rainfall in September: 3.11"

The wettest month (with the highest rainfall) is May (4.65").
The driest month (with the least rainfall) is January (0.98").

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Average rainfall days in September
Alleman, IA

Average rainfall days in September - Alleman, IA
  • Average rainfall days in September: 11.9 days

The month with the highest number of rainy days is June (19.3 days).
The month with the least rainy days is February (4.3 days).

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Average snowfall in September
Alleman, IA

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

The month with the highest snowfall is February (4.57").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Alleman, IA

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

The month with the highest number of snowfall days is January (11.7 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Alleman, 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 2min

The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).

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Average sunshine days in September
Alleman, IA

Average sunshine days in September - Alleman, IA
  • Average sunshine days in September: 15.5 days

The month with the most sunshine days is November (18.4 days).
The month with the least sunshine days is June (8.4 days).

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Average UV index in September
Alleman, IA

Average UV index in September - Alleman, IA
  • Average UV index in September: 4

The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, October, November and December (UV index 2).

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Average cloud cover in September
Alleman, IA

Average cloud cover in September - Alleman, IA
  • Average cloud cover in September: 30

The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is September (Cloud cover 30).

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Average visibility in September
Alleman, IA

Average visibility in September - Alleman, 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).

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Alleman, Iowa, USA

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