September weather forecast
Ames, IA

Weather in September

The first month of the autumn, September, is still a warm month in Ames, Iowa, with an average temperature fluctuating between 74.8°F (23.8°C) and 55.8°F (13.2°C).

Temperature

In Ames, the average high-temperature in September is almost the same as in August - a still warm 74.8°F (23.8°C). In September, the average low-temperature is 55.8°F (13.2°C).

Humidity

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

Rainfall

In Ames, during September, the rain falls for 11.4 days and regularly aggregates up to 3.03" (77mm) of precipitation. In Ames, during the entire year, the rain falls for 130.6 days and collects up to 27.48" (698mm) of precipitation.

Snowfall

June through September are months without snowfall in Ames.

Daylight

The average length of the day in September in Ames is 12h and 28min.
On the first day of September, sunrise is at 6:40 am and sunset at 7:48 pm. On the last day of the month, sunrise is at 7:10 am and sunset at 6:58 pm CDT.

Sunshine

The average sunshine in September in Ames is 9.2h.

UV index

In Ames, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 4 in September transform into the following instructions:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the temperature in September in Ames?

In September, the average high-temperature is 74.8°F (23.8°C), and the average low-temperature is 55.8°F (13.2°C). in July, the average heat index (a.k.a. 'apparent temperature', 'feels like'), which calculates the temperature value influenced by the moisture in the air, is estimated at 87.8°F (31°C).

What is the average humidity in September in Ames?

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

How much does it rain in Ames in September?

In Ames, Iowa, during September, the rain falls for 11.4 days and regularly aggregates up to 3.03" (77mm) of precipitation.

When it does not snow in Ames?

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

Does it snow in Ames in September?

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

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

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

When is the sunrise / sunset in September in Ames?

In September, on the first day of the month, sunrise is at 6:40 am and sunset at 7:48 pm. On the last day of the month, in Ames, sunrise is at 7:10 am and sunset at 6:58 pm CDT.

How long on average sun shines in September in Ames?

In September, the average sunshine duration in Ames, Iowa, is 9.2h.

What is the UV index intensity in September in Ames?

In Ames, Iowa, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate vulnerability from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Ames, IA

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

The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is January (26.6°F).

  • Average low temperature in September: 55.8°F

The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (13.5°F).

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Average pressure in September
Ames, IA

Average pressure in September - Ames, 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
Ames, IA

Average wind speed in September - Ames, IA
  • Average wind speed in September: 8.2mph

The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (7.1mph).

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Average humidity in September
Ames, IA

Average humidity in September - Ames, 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
Ames, IA

Average rainfall in September - Ames, IA
  • Average rainfall in September: 3.03"

The wettest month (with the highest rainfall) is May (4.09").
The driest month (with the least rainfall) is January (0.94").

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Average rainfall days in September
Ames, IA

Average rainfall days in September - Ames, IA
  • Average rainfall days in September: 11.4 days

The month with the highest number of rainy days is June (18 days).
The month with the least rainy days is February (3.3 days).

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Average snowfall in September
Ames, IA

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

The month with the highest snowfall is January (4.06").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Ames, IA

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

The month with the highest number of snowfall days is January (9.1 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
Ames, IA

Average daylight in September / Average sunshine in September - Ames, IA
  • Average daylight in September: 12h and 28min

The month with the longest days is June (Average daylight: 15h and 11min).
The month with the shortest days is December (Average daylight: 9h and 11min).

  • Average sunshine in September: 9h and 12min

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 54min).

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Average sunshine days in September
Ames, IA

Average sunshine days in September - Ames, IA
  • Average sunshine days in September: 16.8 days

The month with the most sunshine days is November (19.4 days).
The month with the least sunshine days is June (10.4 days).

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Average UV index in September
Ames, IA

Average UV index in September - Ames, 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 January (UV index 1).

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Average cloud cover in September
Ames, IA

Average cloud cover in September - Ames, IA
  • Average cloud cover in September: 31

The month with the most cloud cover is January (Cloud cover 57).
The month with the least cloud cover is September (Cloud cover 31).

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Average visibility in September
Ames, IA

Average visibility in September - Ames, 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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