September weather forecast
Promise City, IA

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Weather in September

The first month of the autumn, September, is still a warm month in Promise City, Iowa, with temperature in the range of an average low of 56.5°F (13.6°C) and an average high of 75.9°F (24.4°C).

Temperature

September is characterized by a mild reduction in the average high-temperature, from a moderately hot 82°F (27.8°C) in August to a still warm 75.9°F (24.4°C). Promise City, during September, witnesses an average low-temperature of 56.5°F (13.6°C).

Humidity

The average relative humidity in September in Promise City is 77%.

Rainfall

In Promise City, Iowa, in September, it is raining for 11 days, with typically 2.13" (54mm) of accumulated precipitation. Throughout the year, there are 125.7 rainfall days, and 20.39" (518mm) of precipitation is accumulated.

Snowfall

In Promise City, snow does not fall in June through September.

Daylight

The average length of the day in September is 12h and 27min.
On the first day of September, sunrise is at 6:40 am and sunset at 7:44 pm. On the last day of the month, sunrise is at 7:08 am and sunset at 6:55 pm CDT.

Sunshine

In Promise City, the average sunshine in September is 9.3h.

UV index

In Promise City, 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 ordinary individuals.
Note: In September, the maximum UV index of 4 suggests these recommendations:
Ensure safety - Imperative it is to shield skin and eyes from damage. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Opt for tightly woven and loose clothing to enhance protection from the Sun.

Frequently asked questions

What are September temperatures?

In Promise City, in September, the average high-temperature is 75.9°F (24.4°C), and the average low-temperature is 56.5°F (13.6°C). In August, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, is appraised at 87.8°F (31°C).

What is the average humidity in September?

In September, the average relative humidity is 77%.

How much does it rain in September?

In September, the rain falls for 11 days. Throughout September, 2.13" (54mm) of precipitation is accumulated.

When it does not snow?

June through September are months without snowfall.

Does it snow in September?

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

What is the average length of the day in September?

In Promise City, the average day length in September is 12h and 27min.

When is the sunrise / sunset in September in Promise City?

On the first day of September, sunrise is at 6:40 am and sunset at 7:44 pm. On the last day of the month, sunrise is at 7:08 am and sunset at 6:55 pm CDT.

How many hours of sunshine does Promise City have in September?

In Promise City, the average sunshine duration in September is 9.3h.

What is the UV index reading in September?

In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium hazard to health from unprotected exposure to 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
Promise City, IA

Average temperature in September - Promise City, IA
  • Average high temperature in September: 75.9°F

The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is January (30°F).

  • Average low temperature in September: 56.5°F

The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is January (16.5°F).

Average pressure in September
Promise City, IA

Average pressure in September - Promise City, IA
  • Average pressure in September: 30.02"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).

Average wind speed in September
Promise City, IA

Average wind speed in September - Promise City, IA
  • Average wind speed in September: 8mph

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

Average humidity in September
Promise City, IA

Average humidity in September - Promise City, IA
  • Average humidity in September: 77%

The month with the highest relative humidity is June (83%).
The month with the lowest relative humidity is October (72%).

Average rainfall in September
Promise City, IA

Average rainfall in September - Promise City, IA
  • Average rainfall in September: 2.13"

The wettest month (with the highest rainfall) is June (3.31").
The driest months (with the least rainfall) are January and December (0.71").

Average rainfall days in September
Promise City, IA

Average rainfall days in September - Promise City, IA
  • Average rainfall days in September: 11 days

The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (4.5 days).

Average snowfall in September
Promise City, IA

Average snowfall in September - Promise City, IA
  • Average snowfall in September: 0"

The month with the highest snowfall is January (3.23").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in September
Promise City, IA

Average snowfall days in September - Promise City, IA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (8.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Promise City, IA

Average daylight in September / Average sunshine in September - Promise City, IA
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in September: 9h and 2min

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 18min).

Average sunshine days in September
Promise City, IA

Average sunshine days in September - Promise City, IA
  • Average sunshine days in September: 17.2 days

The month with the most sunshine days is November (21.1 days).
The month with the least sunshine days is June (10.7 days).

Average UV index in September
Promise City, IA

Average UV index in September - Promise City, IA
  • Average UV index in September: 4

The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).

Average cloud cover in September
Promise City, IA

Average cloud cover in September - Promise City, IA
  • Average cloud cover in September: 29

The month with the most cloud cover is January (Cloud cover 52).
The months with the least cloud cover are July, August and September (Cloud cover 29).

Average visibility in September
Promise City, IA

Average visibility in September - Promise City, IA
  • Average visibility in September: 6mi

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

Promise City, Iowa, USA

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