September weather forecast
Marion, IN

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Weather in September

By the time September rolls around, the fall season starts to make its presence felt in Marion. Residents see lower temperatures dropping down to 56.5°F (13.6°C), which is a reprieve from the summer heat. The first signs of fall foliage begin to appear, adding bursts of color to the landscape. September also marks the conclusion of the rainy season with rainfall reducing to 0.75" (19mm). Experiencing lesser showers than previous months, it is an ideal time for outdoor explorations amid cooler conditions.

Temperature

September brings an average high-temperature of a still moderately hot 74.3°F (23.5°C), nearly identical to the preceding month. Marion's nighttime temperature during September is consistently averaged at a moderate 56.5°F (13.6°C).

Humidity

The average relative humidity in September is 79%.

Rainfall

In Marion, in September, during 10.2 rainfall days, 0.75" (19mm) of precipitation is typically accumulated. Throughout the year, in Marion, there are 123.4 rainfall days, and 12.64" (321mm) of precipitation is accumulated.

Snowfall

In Marion, snow does not fall in May through September.

Daylight

The average length of the day in September in Marion is 12h and 27min.
On the first day of the month, sunrise is at 7:10 am and sunset at 8:14 pm. On the last day of September, in Marion, sunrise is at 7:38 am and sunset at 7:25 pm EDT.

Sunshine

In Marion, the average sunshine in September is 8.1h.

UV index

In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the ordinary person.
Note: The maximum UV index, 4 during September, leads to the following recommendations:
Exercise care. People with light skin might get burns in fewer than 30 minutes. Direct Sun exposure should be minimized especially during midday when radiation is most intense. 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.
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Frequently asked questions

What is the average September temperature in Marion?

In September, in Marion, the average high-temperature is 74.3°F (23.5°C), and the average low-temperature is 56.5°F (13.6°C). In July, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which represents the influence of relative humidity on air temperature, is computed to be 87.8°F (31°C).

What is the average humidity in September in Marion?

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

How much does it rain in Marion in September?

In Marion, Indiana, in September, it is raining for 10.2 days, with typically 0.75" (19mm) of accumulated precipitation.

When it does not snow in Marion?

May through September are months without snowfall in Marion, Indiana.

Does it snow in Marion in September?

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

How many hours of daylight does Marion have in September?

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

When are sunrise and sunset in September in Marion?

In September, on the first day of the month, sunrise is at 7:10 am and sunset at 8:14 pm. On the last day of the month, in Marion, sunrise is at 7:38 am and sunset at 7:25 pm EDT.

How long on average sun shines in September in Marion?

The average sunshine duration in September in Marion is 8.1h.

What is the UV index reading in September in Marion?

In Marion, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate vulnerability 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
Marion, IN

Average temperature in September - Marion, IN
  • Average high temperature in September: 74.3°F

The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (31.5°F).

  • Average low temperature in September: 56.5°F

The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).

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Average pressure in September
Marion, IN

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

The months with the highest atmospheric pressure are January and November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in September
Marion, IN

Average wind speed in September - Marion, IN
  • Average wind speed in September: 6.9mph

The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest month (with the lowest average wind speed) is August (6.1mph).

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Average humidity in September
Marion, IN

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

The months with the highest relative humidity are January and December (83%).
The month with the lowest relative humidity is October (73%).

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Average rainfall in September
Marion, IN

Average rainfall in September - Marion, IN
  • Average rainfall in September: 0.75"

The wettest month (with the highest rainfall) is May (1.69").
The driest month (with the least rainfall) is February (0.63").

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Average rainfall days in September
Marion, IN

Average rainfall days in September - Marion, IN
  • Average rainfall days in September: 10.2 days

The month with the highest number of rainy days is May (16.3 days).
The month with the least rainy days is February (4.8 days).

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Average snowfall in September
Marion, IN

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

The month with the highest snowfall is February (1.14").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in September
Marion, IN

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

The month with the highest number of snowfall days is January (9.8 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
Marion, IN

Average daylight in September / Average sunshine in September - Marion, IN
  • Average daylight in September: 12h and 2min

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: 8h and 1min

The months with the most sunshine are June and July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).

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Average sunshine days in September
Marion, IN

Average sunshine days in September - Marion, IN
  • Average sunshine days in September: 18 days

The month with the most sunshine days is November (19.4 days).
The month with the least sunshine days is May (11.6 days).

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Average UV index in September
Marion, IN

Average UV index in September - Marion, IN
  • 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 December (UV index 1).

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Average cloud cover in September
Marion, IN

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

The month with the most cloud cover is January (Cloud cover 64).
The months with the least cloud cover are June, July and August (Cloud cover 34).

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Average visibility in September
Marion, IN

Average visibility in September - Marion, IN
  • Average visibility in September: 6mi

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

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Marion, Indiana, USA

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