September weather forecast
Ottosen, IA

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Weather in September

The first month of the autumn, September, is still a warm month in Ottosen, Iowa, with an average temperature varying between 73.4°F (23°C) and 54.5°F (12.5°C).

Temperature

September's presence records an average high-temperature of a still moderately hot 73.4°F (23°C), closely mirroring August's climate. Ottosen reports an average low-temperature of 54.5°F (12.5°C) during the nights of September.

Humidity

The average relative humidity in September is 75%.

Rainfall

In Ottosen, Iowa, in September, it is raining for 9.5 days, with typically 1.06" (27mm) of accumulated precipitation. In Ottosen, during the entire year, the rain falls for 100.5 days and collects up to 11.69" (297mm) of precipitation.

Snowfall

In Ottosen, Iowa, snow does not fall in May through September.

Daylight

In Ottosen, the average length of the day in September is 12h and 29min.
On the first day of the month, sunrise is at 6:42 am and sunset at 7:51 pm. On the last day of September, in Ottosen, sunrise is at 7:14 am and sunset at 6:59 pm CDT.

Sunshine

In September, the average sunshine in Ottosen is 9.1h.

UV index

In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for the ordinary person.
Note: In September, an average UV index of 4 transforms into the following instructions:
Ensure safety - Sun damage prevention is strongly urged. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Stay sun-safe with clothing that is both closely woven and worn loosely.
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Frequently asked questions

What are September temperatures in Ottosen?

September temperatures vary between a high-temperature of 73.4°F (23°C) and a low-temperature of 54.5°F (12.5°C). The average heat index (a.k.a. 'feels like', 'felt air temperature'), which combines relative humidity and air temperature, in July is estimated at 86°F (30°C).

What is the average humidity in September in Ottosen?

In Ottosen, the average relative humidity in September is 75%.

How much does it rain in Ottosen in September?

In Ottosen, in September, during 9.5 rainfall days, 1.06" (27mm) of precipitation is typically accumulated.

When it does not snow in Ottosen?

May through September are months without snowfall in Ottosen.

Does it snow in Ottosen in September?

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

How many hours of daylight does Ottosen have in September?

The average day length in September is 12h and 29min.

When is the sunrise / sunset in September in Ottosen?

In September, on the first day of the month, sunrise is at 6:42 am and sunset at 7:51 pm. On the last day of the month, in Ottosen, sunrise is at 7:14 am and sunset at 6:59 pm CDT.

How many hours of sunshine does Ottosen have in September?

The average sunshine duration in September in Ottosen, Iowa, is 9.1h.

What is the UV index reading in September in Ottosen?

In September, the average daily maximum UV index in Ottosen is 4. A UV Index estimate of 3 to 5 represents a moderate health threat from exposure to the Sun's UV radiation.
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
Ottosen, IA

Average temperature in September - Ottosen, IA
  • Average high temperature in September: 73.4°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 (23.4°F).

  • Average low temperature in September: 54.5°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 (10.8°F).

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Average pressure in September
Ottosen, IA

Average pressure in September - Ottosen, IA
  • Average pressure in September: 30.01"Hg

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).

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Average wind speed in September
Ottosen, IA

Average wind speed in September - Ottosen, IA
  • Average wind speed in September: 8.7mph

The windiest months (with the highest average wind speed) are January and April (10.9mph).
The calmest months (with the lowest average wind speed) are July and August (7.5mph).

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Average humidity in September
Ottosen, IA

Average humidity in September - Ottosen, IA
  • Average humidity in September: 75%

The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is October (68%).

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Average rainfall in September
Ottosen, IA

Average rainfall in September - Ottosen, IA
  • Average rainfall in September: 1.06"

The wettest month (with the highest rainfall) is June (1.89").
The driest month (with the least rainfall) is January (0.39").

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Average rainfall days in September
Ottosen, IA

Average rainfall days in September - Ottosen, IA
  • Average rainfall days in September: 9.5 days

The month with the highest number of rainy days is June (14.5 days).
The month with the least rainy days is February (2.1 days).

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Average snowfall in September
Ottosen, IA

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

The month with the highest snowfall is February (2.56").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in September
Ottosen, IA

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

The month with the highest number of snowfall days is January (9.8 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
Ottosen, IA

Average daylight in September / Average sunshine in September - Ottosen, 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 6min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).

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Average sunshine days in September
Ottosen, IA

Average sunshine days in September - Ottosen, IA
  • Average sunshine days in September: 17.9 days

The month with the most sunshine days is November (22.5 days).
The month with the least sunshine days is June (12.8 days).

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Average UV index in September
Ottosen, IA

Average UV index in September - Ottosen, 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 December (UV index 1).

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Average cloud cover in September
Ottosen, IA

Average cloud cover in September - Ottosen, IA
  • Average cloud cover in September: 32

The month with the most cloud cover is January (Cloud cover 59).
The month with the least cloud cover is July (Cloud cover 31).

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Average visibility in September
Ottosen, IA

Average visibility in September - Ottosen, IA
  • Average visibility in September: 6mi

The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (6mi).
The month with the lowest visibility is July (5mi).

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Ottosen, Iowa, USA

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