September weather forecast
Flat Rock Park, IN

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Weather in September

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

Temperature

In September, the average high-temperature marginally decreases from a moderately hot 82.8°F (28.2°C) in August to a still warm 77°F (25°C). The temperature dips to an average of 58.3°F (14.6°C) during September nights.

Humidity

The average relative humidity in September is 76%.

Rainfall

The month with the least rainfall is September, when the rain falls for 14.1 days and typically collects 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 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.

Sunshine

In Flat Rock Park, the average sunshine in September is 8.4h.

UV index

In Flat Rock Park, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for ordinary individuals.
Note: In September, the UV index of 5 transforms into the following advice:
Make use of precautions - Suggestions to resist sunburn are communicated. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. 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.
Updated: Jul 29, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are September temperatures?

Flat Rock Park in September has an average high-temperature of 77°F (25°C) and an average low-temperature of 58.3°F (14.6°C). In August, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which takes the relative humidity and factors it into the air temperature reading, is computed to be 89.6°F (32°C).

What is the average humidity in September?

In September, the average relative humidity is 76%.

What is the driest month?

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

How much does it rain in September?

In Flat Rock Park, during September, the rain falls for 14.1 days and regularly aggregates up to 1.73" (44mm) of precipitation.

When it does not snow?

May through October are months without snowfall.

How many hours of daylight does Flat Rock Park have in September?

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

When 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 many hours of sunshine does Flat Rock Park have in September?

In Flat Rock Park, the average sunshine duration in September is 8.4h.

What is the UV index reading in September?

In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a moderate health threat from exposure to the Sun's 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
Flat Rock Park, IN

Average temperature in September - Flat Rock 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
Flat Rock Park, IN

Average pressure in September - Flat Rock 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
Flat Rock Park, IN

Average wind speed in September - Flat Rock 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
Flat Rock Park, IN

Average humidity in September - Flat Rock 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
Flat Rock Park, IN

Average rainfall in September - Flat Rock 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
Flat Rock Park, IN

Average rainfall days in September - Flat Rock 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
Flat Rock Park, IN

Average snowfall in September - Flat Rock 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
Flat Rock Park, IN

Average snowfall days in September - Flat Rock 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
Flat Rock Park, IN

Average daylight in September / Average sunshine in September - Flat Rock 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
Flat Rock Park, IN

Average sunshine days in September - Flat Rock 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
Flat Rock Park, IN

Average UV index in September - Flat Rock 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
Flat Rock Park, IN

Average cloud cover in September - Flat Rock 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
Flat Rock Park, IN

Average visibility in September - Flat Rock 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).

Flat Rock Park, Indiana, USA

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