September weather forecast
Chillicothe, OH

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Weather in September

September introduces the first whiff of autumn, accompanied by a modest drop in temperature. Yet, the transition is subtle, keeping in line with the bright tenor of the previous months. Chillicothe witnesses an increase in wind speed, introducing a pleasantly crisp feel to the air. The amount of rainfall sees a decline but the decrease in cloud cover keeps the bright, sunny days alive. September's weather mediates between summer's end and autumn's onset, offering an interesting interplay of climate characteristics.

Temperature

The beginning of September in Chillicothe subtly marks a decrease in the average high-temperature, transitioning from a moderately hot 82.9°F (28.3°C) in August to a still warm 77.2°F (25.1°C). An average nighttime temperature of 56.5°F (13.6°C) is noted during the month of September.

Humidity

In September, the average relative humidity in Chillicothe, Ohio, is 76%.

Rainfall

The month with the least rainfall in Chillicothe is September, when the rain falls for 12.4 days and typically collects 1.54" (39mm) of precipitation.

Snowfall

In Chillicothe, snow does not fall in May through October.

Daylight

In September, the average length of the day in Chillicothe is 12h and 26min.
On the first day of September, sunrise is at 7:01 am and sunset at 8:02 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 7:15 pm EDT.

Sunshine

In September, the average sunshine is 8.2h.

UV index

The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: An average maximum UV index of 4 in September leads to these recommendations:
Undertake precautions - Guarding against sun damage is counselled. The Sun's radiation is especially intense around midday; try to stay in shade during this period. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
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Frequently asked questions

What is the temperature in September in Chillicothe?

In September, the average high-temperature and low-temperature in Chillicothe are 77.2°F (25.1°C) and 56.5°F (13.6°C) respectively. In August, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which calculates the temperature value influenced by the moisture in the air, is appraised at 89.6°F (32°C).

What is the average humidity in September in Chillicothe?

In September, the average relative humidity in Chillicothe is 76%.

What is the driest month in Chillicothe?

The month with the least rainfall is September, when the rain falls for 12.4 days and typically collects 1.54" (39mm) of precipitation.

How many days does it rain in September in Chillicothe?

In Chillicothe, Ohio, during September, the rain falls for 12.4 days and regularly aggregates up to 1.54" (39mm) of precipitation.

When it does not snow in Chillicothe?

In Chillicothe, snow does not fall in May through October.

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

In Chillicothe, Ohio, the average day length in September is 12h and 26min.

When are sunrise and sunset in September in Chillicothe?

In September, on the first day of the month, sunrise is at 7:01 am and sunset at 8:02 pm. On the last day of the month, in Chillicothe, Ohio, sunrise is at 7:27 am and sunset at 7:15 pm EDT.

How many hours of sunshine does Chillicothe have in September?

In September, the average sunshine duration is 8.2h.

How high is the UV index in September in Chillicothe?

In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a moderate health threat 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
Chillicothe, OH

Average temperature in September - Chillicothe, OH
  • Average high temperature in September: 77.2°F

The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (35.4°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 (22.8°F).

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Average pressure in September
Chillicothe, OH

Average pressure in September - Chillicothe, OH
  • Average pressure in September: 30.04"Hg

The month with the highest atmospheric pressure is November (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).

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Average wind speed in September
Chillicothe, OH

Average wind speed in September - Chillicothe, OH
  • Average wind speed in September: 5.3mph

The windiest months (with the highest average wind speed) are January and February (8.3mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

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Average humidity in September
Chillicothe, OH

Average humidity in September - Chillicothe, OH
  • Average humidity in September: 76%

The months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is November (75%).

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Average rainfall in September
Chillicothe, OH

Average rainfall in September - Chillicothe, OH
  • Average rainfall in September: 1.54"

The wettest month (with the highest rainfall) is May (2.95").
The driest month (with the least rainfall) is September (1.54").

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Average rainfall days in September
Chillicothe, OH

Average rainfall days in September - Chillicothe, OH
  • Average rainfall days in September: 12.4 days

The month with the highest number of rainy days is May (17.9 days).
The month with the least rainy days is November (8.4 days).

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Average snowfall in September
Chillicothe, OH

Average snowfall in September - Chillicothe, OH
  • Average snowfall in September: 0"

The month with the highest snowfall is January (2.48").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
Chillicothe, OH

Average snowfall days in September - Chillicothe, OH
  • 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 June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Chillicothe, OH

Average daylight in September / Average sunshine in September - Chillicothe, OH
  • 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 1min

The month with the most sunshine is August (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).

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Average sunshine days in September
Chillicothe, OH

Average sunshine days in September - Chillicothe, OH
  • Average sunshine days in September: 16 days

The month with the most sunshine days is November (19.9 days).
The month with the least sunshine days is May (9.8 days).

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Average UV index in September
Chillicothe, OH

Average UV index in September - Chillicothe, OH
  • 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
Chillicothe, OH

Average cloud cover in September - Chillicothe, OH
  • Average cloud cover in September: 33

The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 28).

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Average visibility in September
Chillicothe, OH

Average visibility in September - Chillicothe, OH
  • Average visibility in September: 5mi

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

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Chillicothe, Ohio, USA

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