September weather forecast
Knowlton, IA

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Weather in September

September, the first month of the autumn in Knowlton, is still a warm month, with an average temperature ranging between max 75.9°F (24.4°C) and min 56.3°F (13.5°C).

Temperature

The onset of September aligns with a soft reduction in the average high-temperature, gently falling from 81.7°F (27.6°C) in August to a still moderately hot 75.9°F (24.4°C). In September, Knowlton encounters an average low-temperature of 56.3°F (13.5°C) during the night.

Humidity

In September, the average relative humidity is 76%.

Rainfall

In Knowlton, in September, during 11 rainfall days, 2.24" (57mm) of precipitation is typically accumulated. In Knowlton, Iowa, during the entire year, the rain falls for 126.9 days and collects up to 22.6" (574mm) of precipitation.

Snowfall

June through September are months without snowfall.

Daylight

In Knowlton, Iowa, the average length of the day in September is 12h and 27min.
On the first day of September in Knowlton, sunrise is at 6:45 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 7:13 am and sunset at 7:00 pm CDT.

Sunshine

In Knowlton, the average sunshine in September is 9.3h.

UV index

In September, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for the average person.
Note: During September, 5 as the daily maximum UV index converts into the following advice:
Proceed with care. Light skin individuals may be exposed to burns in fewer than 30 minutes. The solar radiation around mid-day is intense; avoid the Sun and stay safe. 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.
Updated: Aug 30, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the usual temperature for Knowlton in September?

The high-temperature, in September, in Knowlton, records 75.9°F (24.4°C), while the low-temperature is 56.3°F (13.5°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which combines relative humidity and air temperature, in August is estimated at 87.8°F (31°C).

What is the average humidity in September?

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

How many days does it rain in September?

In Knowlton, in September, it is raining for 11 days, with typically 2.24" (57mm) of accumulated precipitation.

When it does not snow?

In Knowlton, snow does not fall in June through September.

Does it snow in Knowlton in September?

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

How many hours of daylight does Knowlton have in September?

The average day length in September is 12h and 27min.

When is the sunrise / sunset in September?

In September, on the first day of the month, sunrise is at 6:45 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 7:13 am and sunset at 7:00 pm CDT.

How long on average sun shines in September?

In September, the average sunshine duration is 9.3h.

What is the UV index intensity in September?

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

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

The warmest month (with the highest average high temperature) is July (83.5°F).
The month with the lowest average high temperature is January (30.6°F).

  • Average low temperature in September: 56.3°F

The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is January (16.9°F).

Average pressure in September
Knowlton, IA

Average pressure in September - Knowlton, 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).

Average wind speed in September
Knowlton, IA

Average wind speed in September - Knowlton, IA
  • Average wind speed in September: 7.8mph

The windiest months (with the highest average wind speed) are January, February and March (10.3mph).
The calmest months (with the lowest average wind speed) are July and August (6.8mph).

Average humidity in September
Knowlton, IA

Average humidity in September - Knowlton, IA
  • Average humidity in September: 76%

The month with the highest relative humidity is June (82%).
The month with the lowest relative humidity is October (71%).

Average rainfall in September
Knowlton, IA

Average rainfall in September - Knowlton, IA
  • Average rainfall in September: 2.24"

The wettest month (with the highest rainfall) is June (3.86").
The driest months (with the least rainfall) are February and December (0.71").

Average rainfall days in September
Knowlton, IA

Average rainfall days in September - Knowlton, IA
  • Average rainfall days in September: 11 days

The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is January (4.1 days).

Average snowfall in September
Knowlton, IA

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

The month with the highest snowfall is January (3.54").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in September
Knowlton, IA

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

The month with the highest number of snowfall days is January (8.4 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Knowlton, IA

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

The month with the longest days is June (Average daylight: 15h and 6min).
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 18min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).

Average sunshine days in September
Knowlton, IA

Average sunshine days in September - Knowlton, IA
  • Average sunshine days in September: 16.9 days

The month with the most sunshine days is November (21.2 days).
The month with the least sunshine days is May (10.6 days).

Average UV index in September
Knowlton, IA

Average UV index in September - Knowlton, IA
  • Average UV index in September: 5

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
Knowlton, IA

Average cloud cover in September - Knowlton, IA
  • Average cloud cover in September: 29

The month with the most cloud cover is January (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 28).

Average visibility in September
Knowlton, IA

Average visibility in September - Knowlton, 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).

Knowlton, Iowa, USA

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