September weather forecast
Columbus, IL

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Weather in September

September, the first month of the autumn in Columbus, is still a warm month, with temperature in the range of an average high of 77.5°F (25.3°C) and an average low of 58.1°F (14.5°C).

Temperature

The start of September signals a gentle decrease in the average high-temperature, transitioning from a warm 82.9°F (28.3°C) in August to a still moderately hot 77.5°F (25.3°C). An average nighttime temperature of 58.1°F (14.5°C) is observed during September.

Humidity

In Columbus, the average relative humidity in September is 75%.

Rainfall

In Columbus, in September, it is raining for 10.4 days, with typically 2.4" (61mm) of accumulated precipitation. Throughout the year, there are 134.2 rainfall days, and 23.15" (588mm) of precipitation is accumulated.

Snowfall

In Columbus, snow does not fall in May through September.

Daylight

In Columbus, the average length of the day in September is 12h and 26min.
On the first day of the month, sunrise is at 6:33 am and sunset at 7:35 pm. On the last day of September, sunrise is at 7:00 am and sunset at 6:48 pm CDT.

Sunshine

The average sunshine in September in Columbus is 9.4h.

UV index

In Columbus, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: In September, the UV index of 5 transforms into the following advice:
Put precautions into practice - Ensuring skin and eye safety is a necessity. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes.

Frequently asked questions

What are September temperatures?

In Columbus, 77.5°F (25.3°C) is the average high-temperature and 58.1°F (14.5°C) is the average low-temperature during September. The average heat index (a.k.a. 'felt air temperature', 'feels like'), which factors the actual air temperature with the relative humidity, in August is computed to be 91.4°F (33°C).

What is the average humidity in September?

The average relative humidity in September is 75%.

How much does it rain in September?

In Columbus, Illinois, in September, it is raining for 10.4 days, with typically 2.4" (61mm) of accumulated precipitation.

When it does not snow?

May through September are months without snowfall.

Does it snow in September?

In Columbus, in September, it doesn't snow. In October, it regularly snows.

What is the average length of the day in September?

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

What time are sunrise and sunset in September?

On the first day of September in Columbus, sunrise is at 6:33 am and sunset at 7:35 pm. On the last day of the month, sunrise is at 7:00 am and sunset at 6:48 pm CDT.

How long on average sun shines in September?

In Columbus, the average sunshine duration in September is 9.4h.

What is the UV index intensity in September?

The average daily maximum UV index in September in Columbus is 5. A UV Index value of 3 to 5 symbolizes a medium health risk 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
Columbus, IL

Average temperature in September - Columbus, IL
  • Average high temperature in September: 77.5°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 (32.7°F).

  • Average low temperature in September: 58.1°F

The month with the highest average low temperature is July (66.6°F).
The coldest month (with the lowest average low temperature) is January (20.1°F).

Average pressure in September
Columbus, IL

Average pressure in September - Columbus, IL
  • Average pressure in September: 30.02"Hg

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

Average wind speed in September
Columbus, IL

Average wind speed in September - Columbus, IL
  • Average wind speed in September: 7.2mph

The windiest months (with the highest average wind speed) are January and February (10.3mph).
The calmest month (with the lowest average wind speed) is July (6.4mph).

Average humidity in September
Columbus, IL

Average humidity in September - Columbus, IL
  • Average humidity in September: 75%

The months with the highest relative humidity are June and July (81%).
The month with the lowest relative humidity is October (71%).

Average rainfall in September
Columbus, IL

Average rainfall in September - Columbus, IL
  • Average rainfall in September: 2.4"

The wettest month (with the highest rainfall) is May (3.35").
The driest months (with the least rainfall) are January and December (1.02").

Average rainfall days in September
Columbus, IL

Average rainfall days in September - Columbus, IL
  • Average rainfall days in September: 10.4 days

The month with the highest number of rainy days is May (16.9 days).
The month with the least rainy days is January (5 days).

Average snowfall in September
Columbus, IL

Average snowfall in September - Columbus, IL
  • Average snowfall in September: 0"

The month with the highest snowfall is January (2.76").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in September
Columbus, IL

Average snowfall days in September - Columbus, IL
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (8.8 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
Columbus, IL

Average daylight in September / Average sunshine in September - Columbus, IL
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).

  • Average sunshine in September: 9h and 2min

The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).

Average sunshine days in September
Columbus, IL

Average sunshine days in September - Columbus, IL
  • Average sunshine days in September: 18.1 days

The month with the most sunshine days is December (19.6 days).
The month with the least sunshine days is June (11.1 days).

Average UV index in September
Columbus, IL

Average UV index in September - Columbus, IL
  • 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
Columbus, IL

Average cloud cover in September - Columbus, IL
  • Average cloud cover in September: 30

The month with the most cloud cover is January (Cloud cover 53).
The month with the least cloud cover is July (Cloud cover 28).

Average visibility in September
Columbus, IL

Average visibility in September - Columbus, IL
  • Average visibility in September: 6mi

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

Columbus, Illinois, USA

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