September weather forecast
Knox, IN

Weather in September

The first month of the autumn, September, is also a moderately hot month in Knox, Indiana, with temperature in the range of an average low of 56.3°F (13.5°C) and an average high of 73.8°F (23.2°C).

Temperature

In Knox, the average high-temperature in September is practically the same as in August - a still moderately hot 73.8°F (23.2°C). The average low-temperature, in September, is 56.3°F (13.5°C).

Humidity

The average relative humidity in September in Knox is 79%.

Rainfall

In Knox, Indiana, in September, during 14.9 rainfall days, 2.17" (55mm) of precipitation is typically accumulated. In Knox, during the entire year, the rain falls for 175.4 days and collects up to 34.29" (871mm) of precipitation.

Snowfall

June through September are months without snowfall.

Daylight

The average length of the day in September is 12h and 28min.
On the first day of the month, sunrise is at 6:13 am and sunset at 7:19 pm. On the last day of September, in Knox, sunrise is at 6:42 am and sunset at 6:30 pm CDT.

Sunshine

In September, the average sunshine in Knox is 8.3h.

UV index

The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for ordinary individuals.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the average humidity in September in Knox?

In Knox, the average relative humidity in September is 79%.

How much does it rain in Knox in September?

In Knox, Indiana, during September, the rain falls for 14.9 days and regularly aggregates up to 2.17" (55mm) of precipitation.

When it does not snow in Knox?

June through September are months without snowfall.

Does it snow in Knox in September?

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

How many hours of daylight does Knox have in September?

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

When are sunrise and sunset in September in Knox?

In September, on the first day of the month, sunrise is at 6:13 am and sunset at 7:19 pm. On the last day of the month, in Knox, sunrise is at 6:42 am and sunset at 6:30 pm CDT.

How long on average sun shines in September in Knox?

In September, the average sunshine duration in Knox is 8.3h.

What is the UV index intensity in September in Knox?

The average daily maximum UV index in September in Knox, Indiana, is 4. A UV Index estimate of 3 to 5 represents a medium health risk from exposure to the Sun's UV radiation.

Average temperature in September
Knox, IN

Average temperature in September - Knox, IN
  • Average high temperature in September: 73.8°F

The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (29.8°F).

  • Average low temperature in September: 56.3°F

The month with the highest average low temperature is July (63.3°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).

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Average pressure in September
Knox, IN

Average pressure in September - Knox, IN
  • Average pressure in September: 30.03"Hg

The months with the highest atmospheric pressure are January and November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in September
Knox, IN

Average wind speed in September - Knox, IN
  • Average wind speed in September: 7mph

The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.2mph).

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Average humidity in September
Knox, IN

Average humidity in September - Knox, IN
  • Average humidity in September: 79%

The months with the highest relative humidity are January, February and July (84%).
The month with the lowest relative humidity is October (74%).

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Average rainfall in September
Knox, IN

Average rainfall in September - Knox, IN
  • Average rainfall in September: 2.17"

The wettest month (with the highest rainfall) is May (4.45").
The driest month (with the least rainfall) is January (1.85").

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Average rainfall days in September
Knox, IN

Average rainfall days in September - Knox, IN
  • Average rainfall days in September: 14.9 days

The month with the highest number of rainy days is May (20.7 days).
The month with the least rainy days is January (7.9 days).

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Average snowfall in September
Knox, IN

Average snowfall in September - Knox, IN
  • Average snowfall in September: 0"

The month with the highest snowfall is February (5.04").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Knox, IN

Average snowfall days in September - Knox, IN
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (15.3 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
Knox, IN

Average daylight in September / Average sunshine in September - Knox, IN
  • Average daylight in September: 12h and 28min

The month with the longest days is June (Average daylight: 15h and 7min).
The month with the shortest days is December (Average daylight: 9h and 15min).

  • Average sunshine in September: 8.3h

The month with the most sunshine is July (Average sunshine: 9.9h).
The month with the least sunshine is January (Average sunshine: 3.4h).

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Average sunshine days in September
Knox, IN

Average sunshine days in September - Knox, IN
  • Average sunshine days in September: 13 days

The month with the most sunshine days is November (14.6 days).
The month with the least sunshine days is June (7.8 days).

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Average UV index in September
Knox, IN

Average UV index in September - Knox, IN
  • Average UV index in September: 4

The month with the highest UV index is June (UV index 6).
The month with the lowest UV index is December (UV index 1).

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Average cloud cover in September
Knox, IN

Average cloud cover in September - Knox, IN
  • Average cloud cover in September: 35

The month with the most cloud cover is January (Cloud cover 65).
The month with the least cloud cover is August (Cloud cover 33).

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Average visibility in September
Knox, IN

Average visibility in September - Knox, IN
  • Average visibility in September: 5mi

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

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