September weather forecast and climate
Hartwell, OH

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

Temperature

In September, the average high-temperature slightly decreases, from 83.1°F (28.4°C) in August, to a still warm 77.2°F (25.1°C). The average low-temperature, in Hartwell, is 58.6°F (14.8°C).

Humidity

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

Rainfall

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

Snowfall

May through October are months without snowfall in Hartwell.

Daylight

The average length of the day in September is 12.4h.

Sunshine

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

UV index

In Hartwell, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to the UV radiation for the average person.
Note: In September, the average maximum UV index of 5 translate into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. 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 Hartwell?

The average high-temperature, in September, in Hartwell, Ohio, is 77.2°F (25.1°C), while the average low-temperature is 58.6°F (14.8°C).

What is the least humid month in Hartwell?

Months with the lowest humidity in Hartwell, Ohio, are August through October, with an average relative humidity of 74%.

What is the average humidity in September in Hartwell?

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

How many days does it rain in September in Hartwell?

In Hartwell, 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 Hartwell?

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

When it does not snow in Hartwell?

May through October are months without snowfall in Hartwell.

What is the average length of the day in September in Hartwell?

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

How long on average sun shines in September in Hartwell?

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

What is the UV index intensity in September in Hartwell?

In Hartwell, Ohio, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium health risk from unsafe exposure to the Sun's UV rays.
Average temperature in September - Hartwell, 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 - Hartwell, 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 - Hartwell, 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 - Hartwell, 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 - Hartwell, 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 - Hartwell, 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 - Hartwell, 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 - Hartwell, 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 - Hartwell, 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: 9.5h).

  • 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 - Hartwell, 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 - Hartwell, 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 - Hartwell, 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 - Hartwell, 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).