September weather forecast
Forest Park, IN

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Weather in September

September, the first month of the autumn in Forest Park, is still a warm month, with an average temperature varying between 58.3°F (14.6°C) and 77°F (25°C).

Temperature

In September, the meteorological conditions change slightly, with the average high-temperature moving from 82.8°F (28.2°C) in August to a still warm 77°F (25°C). Forest Park in September experiences a low-temperature average of 58.3°F (14.6°C).

Humidity

In September, the average relative humidity is 76%.

Rainfall

September is the month with the least rainfall. Rain falls for 14.1 days and accumulates 1.73" (44mm) of precipitation.

Snowfall

May through October are months without snowfall.

Daylight

In September, the average length of the day is 12h and 26min.
On the first day of the month, sunrise is at 7:12 am and sunset at 8:13 pm. On the last day of September, sunrise is at 7:39 am and sunset at 7:27 pm EDT.

Sunshine

The average sunshine in September in Forest Park is 8.4h.

UV index

The average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for average individuals.
Note: A maximum daily UV index of 5 during September morphs into the following directions:
Take care. Persons with lighter skin might suffer burns in less than 30 minutes. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses.

Frequently asked questions

What is the average September temperature?

In September, in Forest Park, the average high-temperature is 77°F (25°C), and the average low-temperature is 58.3°F (14.6°C). The average heat index (a.k.a. 'apparent temperature', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, in August is calculated to be 89.6°F (32°C).

What is the average humidity in September in Forest Park?

The average relative humidity in September in Forest Park is 76%.

What is the driest month?

The month with the least rainfall is September, when the rain falls for 14.1 days and typically collects 1.73" (44mm) of precipitation.

How much does it rain in September?

In Forest Park, Indiana, in September, during 14.1 rainfall days, 1.73" (44mm) of precipitation is typically accumulated.

When it does not snow?

May through October are months without snowfall.

How many hours of daylight does Forest Park have in September?

In Forest Park, Indiana, the average day length in September is 12h and 26min.

What time are sunrise and sunset in September?

On the first day of September, sunrise is at 7:12 am and sunset at 8:13 pm. On the last day of the month, sunrise is at 7:39 am and sunset at 7:27 pm EDT.

How long on average sun shines in September?

The average sunshine duration in September is 8.4h.

What is the UV index reading in September?

The average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a moderate health threat 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
Forest Park, IN

Average temperature in September - Forest Park, IN
  • Average high temperature in September: 77°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 (35.2°F).

  • Average low temperature in September: 58.3°F

The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is January (22.5°F).

Average pressure in September
Forest Park, IN

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

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed in September
Forest Park, IN

Average wind speed in September - Forest Park, IN
  • Average wind speed in September: 5.9mph

The windiest months (with the highest average wind speed) are January and February (8.9mph).
The calmest months (with the lowest average wind speed) are July and August (5.3mph).

Average humidity in September
Forest Park, IN

Average humidity in September - Forest Park, IN
  • Average humidity in September: 76%

The months with the highest relative humidity are January, February, July and December (81%).
The month with the lowest relative humidity is October (74%).

Average rainfall in September
Forest Park, IN

Average rainfall in September - Forest Park, IN
  • Average rainfall in September: 1.73"

The wettest month (with the highest rainfall) is May (3.5").
The driest month (with the least rainfall) is September (1.73").

Average rainfall days in September
Forest Park, IN

Average rainfall days in September - Forest Park, IN
  • Average rainfall days in September: 14.1 days

The month with the highest number of rainy days is May (18.3 days).
The months with the least rainy days are January and February (9.4 days).

Average snowfall in September
Forest Park, IN

Average snowfall in September - Forest Park, IN
  • Average snowfall in September: 0"

The month with the highest snowfall is February (2.17").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Forest Park, IN

Average snowfall days in September - Forest Park, IN
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (9.6 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Forest Park, IN

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

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in September: 8h 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 6min).

Average sunshine days in September
Forest Park, IN

Average sunshine days in September - Forest Park, IN
  • Average sunshine days in September: 13.8 days

The month with the most sunshine days is October (17.7 days).
The month with the least sunshine days is May (10.3 days).

Average UV index in September
Forest Park, IN

Average UV index in September - Forest Park, IN
  • Average UV index in September: 5

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in September
Forest Park, IN

Average cloud cover in September - Forest Park, IN
  • Average cloud cover in September: 32

The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 29).

Average visibility in September
Forest Park, IN

Average visibility in September - Forest Park, IN
  • Average visibility in September: 6mi

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

Forest Park, Indiana, USA

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