September weather forecast and climate
Forest Park, OH

The first month of the autumn, September, is also a moderately hot month in Forest Park, Ohio, with average temperature ranging between max 77.2°F (25.1°C) and min 58.6°F (14.8°C).

Temperature

In Forest Park, Ohio, the average high-temperature marginally drops, from 83.1°F (28.4°C) in August, to a still warm 77.2°F (25.1°C). The average low-temperature, in September, is 58.6°F (14.8°C).

Humidity

August through October, with an average relative humidity of 74%, are the least humid months.

Rainfall

The month with the least rainfall is September when the rain falls for 9.3 days and typically collects 0.63" (16mm) of precipitation.

Snowfall

In Forest Park snow does not fall in May through October.

Daylight

In Forest Park, the average length of the day is 12.4h.

Sunshine

In Forest Park, the average sunshine in September is 8.3h.

UV index

In September, the average daily maximum UV index in Forest Park, Ohio, is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to the UV radiation for the ordinary person.
Note: The average daily UV index of 5 transform into the following instructions:
Take precautions - Protection against sun damage is advised. 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.

What is the temperature in September in Forest Park?

In Forest Park, in September, the average high-temperature is 77.2°F (25.1°C), and the average low-temperature is 58.6°F (14.8°C).

What is the least humid month in Forest Park?

August through October, with an average relative humidity of 74%, are the least humid months.

What is the average humidity in September in Forest Park?

In September, the average relative humidity in Forest Park, Ohio, is 74%.

How many days does it rain in September in Forest Park?

In Forest Park, during September, the rain falls for 9.3 days and regularly aggregates up to 0.63" (16mm) of precipitation.

What is the driest month in Forest Park?

The month with the least rainfall is September when the rain falls for 9.3 days and typically collects 0.63" (16mm) of precipitation.

When it does not snow in Forest Park?

May through October are months without snowfall in Forest Park.

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

In September, the average length of the day in Forest Park is 12.4h.

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

The average sunshine in September is 8.3h.

How high is the UV index in September in Forest Park?

The average daily maximum UV index in September in Forest Park is 5. A UV Index value of 3 to 5 symbolizes a moderate health threat from unsafe exposure to the Sun's UV rays.
Average temperature in September - Forest Park, OH
  • Average high temperature in September: 25.1°C

The warmest month (with the highest average high temperature) is July (28.9°C).
The month with the lowest average high temperature is January (1.8°C).

  • Average low temperature in September: 14.8°C

The month with the highest average low temperature is July (19.1°C).
The coldest month (with the lowest average low temperature) is January (-4.9°C).

Average pressure in September - Forest Park, OH
  • Average pressure in September: 1017.1mbar

The month with the highest atmospheric pressure is January (1020.7mbar).
The month with the lowest atmospheric pressure is June (1013.9mbar).

Average wind speed in September - Forest Park, OH
  • Average wind speed in September: 9.3km/h

The windiest month (with the highest average wind speed) is January (14.3km/h).
The calmest months (with the lowest average wind speed) are July and August (8.4km/h).

Average humidity in September - Forest Park, OH
  • Average humidity in September: 74%

The month with the highest relative humidity is December (81%).
Months with the lowest relative humidity are August, September and October (74%).

Average rainfall in September - Forest Park, OH
  • Average rainfall in September: 16mm

The wettest month (with the highest rainfall) is May (36mm).
The driest month (with the least rainfall) is September (16mm).

Average rainfall days in September - Forest Park, OH
  • Average rainfall days in September: 9.3 days

The month with the highest number of rainy days is May (13.8 days).
The month with the least rainy days is November (6.5 days).

Average snowfall in September - Forest Park, OH
  • Average snowfall in September: 0mm

The month with the highest snowfall is January (24mm).
Months with the least snowfall are May, June, July, August, September and October (0mm).

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

The month with the highest number of snowfall days is February (6.1 days).
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, OH
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.4h).

  • Average sunshine in September: 8.3h

The month with the most sunshine is July (Average sunshine: 10.4h).
The month with the least sunshine is January (Average sunshine: 4h).

Average sunshine days in September - Forest Park, OH
  • Average sunshine days in September: 18.9 days

The month with the most sunshine days is November (20.8 days).
The month with the least sunshine days is June (14 days).

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

Months with the highest UV index are May, June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).

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

The month with the most cloud cover is January (Cloud cover 59).
The month with the least cloud cover is August (Cloud cover 26).

Average visibility in September - Forest Park, OH
  • Average visibility in September: 9km

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).