September weather forecast
Ralston, IA

Weather in September

September, the first month of the autumn in Ralston, is also a moderately hot month, with an average temperature fluctuating between 55.8°F (13.2°C) and 74.7°F (23.7°C).

Temperature

In September, the average high-temperature is essentially the same as in August - a still moderately hot 74.7°F (23.7°C). In September, in Ralston, the average low-temperature is 55.8°F (13.2°C).

Humidity

In September, the average relative humidity is 75%.

Rainfall

In Ralston, Iowa, in September, it is raining for 10.9 days, with typically 2.72" (69mm) of accumulated precipitation. Throughout the year, in Ralston, there are 130.1 rainfall days, and 27.28" (693mm) of precipitation is accumulated.

Snowfall

June through September are months without snowfall in Ralston.

Daylight

In September, the average length of the day is 12h and 28min.
On the first day of September in Ralston, sunrise is at 6:44 am and sunset at 7:52 pm. On the last day of the month, sunrise is at 7:14 am and sunset at 7:02 pm CDT.

Sunshine

In Ralston, the average sunshine in September is 9.2h.

UV index

The average daily maximum UV index in September in Ralston is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for the average person.
Note: The daily maximum UV index of 4 in September interpret into the following advice:
Take precautions - Protection against skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for the 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 Ralston?

In Ralston, Iowa, in September, the average high-temperature is 74.7°F (23.7°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 represents the influence of relative humidity on air temperature, is appraised at 87.8°F (31°C).

What is the average humidity in September in Ralston?

The average relative humidity in September in Ralston, Iowa, is 75%.

How many days does it rain in September in Ralston?

In Ralston, Iowa, during September, the rain falls for 10.9 days and regularly aggregates up to 2.72" (69mm) of precipitation.

When it does not snow in Ralston?

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

Does it snow in Ralston in September?

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

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

The average day length in September is 12h and 28min.

When is the sunrise / sunset in September in Ralston?

In September, on the first day of the month, sunrise is at 6:44 am and sunset at 7:52 pm. On the last day of the month, sunrise is at 7:14 am and sunset at 7:02 pm CDT.

How many hours of sunshine does Ralston have in September?

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

What is the UV index reading in September in Ralston?

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

Average temperature in September - Ralston, IA
  • Average high temperature in September: 74.7°F

The warmest month (with the highest average high temperature) is July (81.5°F).
The month with the lowest average high temperature is January (26.2°F).

  • Average low temperature in September: 55.8°F

The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (13.6°F).

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Average pressure in September
Ralston, IA

Average pressure in September - Ralston, 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
Ralston, IA

Average wind speed in September - Ralston, IA
  • Average wind speed in September: 8.5mph

The windiest month (with the highest average wind speed) is January (11.1mph).
The calmest month (with the lowest average wind speed) is July (7.2mph).

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Average humidity in September
Ralston, IA

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

The month with the highest relative humidity is January (84%).
The months with the lowest relative humidity are April and October (69%).

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Average rainfall in September
Ralston, IA

Average rainfall in September - Ralston, IA
  • Average rainfall in September: 2.72"

The wettest month (with the highest rainfall) is May (4.29").
The driest month (with the least rainfall) is January (0.94").

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Average rainfall days in September
Ralston, IA

Average rainfall days in September - Ralston, IA
  • Average rainfall days in September: 10.9 days

The month with the highest number of rainy days is June (17.9 days).
The month with the least rainy days is February (4.3 days).

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Average snowfall in September
Ralston, IA

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

The month with the highest snowfall is February (5.12").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Ralston, IA

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

The month with the highest number of snowfall days is January (11.8 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
Ralston, IA

Average daylight in September / Average sunshine in September - Ralston, 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 10min).

  • Average sunshine in September: 9h and 12min

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 12min).

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Average sunshine days in September
Ralston, IA

Average sunshine days in September - Ralston, IA
  • Average sunshine days in September: 17.2 days

The month with the most sunshine days is November (18.9 days).
The month with the least sunshine days is June (10 days).

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Average UV index in September
Ralston, IA

Average UV index in September - Ralston, 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 February (UV index 1).

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Average cloud cover in September
Ralston, IA

Average cloud cover in September - Ralston, 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 July (Cloud cover 28).

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Average visibility in September
Ralston, IA

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

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

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