September weather forecast and climate
Ames, IA

Weather in September

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

Temperature

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

Humidity

In September, the average relative humidity is 76%.

Rainfall

In Ames, in September, it is raining for 11.4 days, with typically 3.03" (77mm) of accumulated precipitation. In Ames, during the entire year, the rain falls for 130.6 days and collects up to 27.48" (698mm) of precipitation.

Snowfall

In Ames snow does not fall in June through September.

Daylight

The average length of the day in Ames is 12.5h.

Sunshine

The average sunshine in September is 9.2h.

UV index

In Ames, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium health hazard from the exposure to the Sun's UV radiation for the average person.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the temperature in September in Ames?

In September, in Ames, Iowa, the average high-temperature is 74.8°F (23.8°C), and the average low-temperature is 55.8°F (13.2°C).

What is the average humidity in September in Ames?

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

How much does it rain in Ames in September?

In September, in Ames, the rain falls for 11.4 days. Throughout September, 3.03" (77mm) of precipitation is accumulated.

Does it snow in Ames in September?

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

When it does not snow in Ames?

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

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

The average length of the day in September is 12.5h.

How long on average sun shines in September in Ames?

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

What is the UV index intensity in September in Ames?

In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium hazard to health from unsafe exposure to the Sun's UV rays.

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"

The month with the highest atmospheric pressure is January (30.16").
The month with the lowest atmospheric pressure is June (29.88").

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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").
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).
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: 12.5h

The month with the longest days is June (Average daylight: 15.2h).
The month with the shortest days is December (Average daylight: 9.2h).

  • Average sunshine in September: 9.2h

The month with the most sunshine is July (Average sunshine: 10.1h).
The month with the least sunshine is January (Average sunshine: 3.9h).

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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

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

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

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