October weather forecast
Chicago, IL

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The city of Chicago in Illinois on the shores of Lake Michigan, with a superb view of the sandy beach of Oak Street
The city of Chicago in Illinois on the shores of Lake Michigan, with a superb view of the sandy beach of Oak Street

Weather in October

October in Chicago is a newfound favorite among locals and tourists, boasting a comfortable climate with the fall colors in full display. This month marks a clear departure from the warmth of September. A reduction in daylight hours is noticeable, replaced with cooler and longer nights. Misty mornings, crackling fallen leaves, and jacket-engine weather truly add to the essence of fall in the Windy City.

Temperature

In Chicago, entering October brings a temperature decrement, reducing from September's agreeable 71.1°F (21.7°C) to a mild 59.5°F (15.3°C). Chicago, during the month of October, experiences an average low-temperature of 48.9°F (9.4°C).

Humidity

October is the least humid month, with an average relative humidity of 73%.

Rainfall

In Chicago, during October, the rain falls for 14.2 days and regularly aggregates up to 3.11" (79mm) of precipitation. Throughout the year, in Chicago, there are 160.2 rainfall days, and 36.97" (939mm) of precipitation is accumulated.

Snowfall

June through October are months without snowfall.

Ocean temperature

In Chicago, Illinois, in October, the average water temperature is 58.8°F (14.9°C).
Note: It is life-risking to swim in 58.8°F (14.9°C). Briefly staying in 55.4°F (13°C) waters feels unsettling, and temperatures below 50°F (10°C) might result in cold shock and loss of breath control, hinging on personal endurance.

Daylight

In Chicago, the average length of the day in October is 11h and 4min.
On the first day of October in Chicago, sunrise is at 6:48 am and sunset at 6:31 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 5:45 pm CDT.

Sunshine

The average sunshine in October in Chicago is 5.9h.

UV index

The average daily maximum UV index in October is 2. A UV Index estimate of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for average individuals.
Note: In October, the maximum UV index of 2 suggests this advice:
Although prolonged sun exposure does not typically bother most people, children, babies, and those with sensitive skin should always have protection. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Stay alert! Snow's reflective properties can almost double the UV radiation from the Sun.
Updated: Feb 12, 2024 | Published by: Weather Atlas | About Us / Weather Forecasting / Data Sources

Frequently asked questions

What is the temperature in October in Chicago?

The average high-temperature, in October, in Chicago, is 59.5°F (15.3°C), while the average low-temperature is 48.9°F (9.4°C).

What is the least humid month in Chicago?

With an average relative humidity of 73%, October is the least humid month in Chicago, Illinois.

What is the average humidity in October in Chicago?

The average relative humidity in October in Chicago is 73%.

How many days does it rain in October in Chicago?

In Chicago, during October, the rain falls for 14.2 days and regularly aggregates up to 3.11" (79mm) of precipitation.

When it does not snow in Chicago?

In Chicago, snow does not fall in June through October.

Does it snow in Chicago in October?

In Chicago, Illinois, in October, it doesn't snow. In November, it regularly snows.

How cold is the water in October in Chicago?

In October, the average ocean temperature in Chicago, Illinois, is 58.8°F (14.9°C). Swimming in 58.8°F (14.9°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

What is the average length of the day in October in Chicago?

In October, the average day length in Chicago is 11h and 4min.

When is the sunrise / sunset in October in Chicago?

In October, on the first day of the month, sunrise is at 6:48 am and sunset at 6:31 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 5:45 pm CDT.

How long on average sun shines in October in Chicago?

The average sunshine duration in October is 5.9h.

What is the UV index reading in October in Chicago?

In October, the average daily maximum UV index is 2. A UV Index of 2, and less, symbolizes a minimal hazard to health 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 October
Chicago, IL

Average temperature in October - Chicago, IL
  • Average high temperature in October: 59.5°F

The warmest month (with the highest average high temperature) is August (77.5°F).
The month with the lowest average high temperature is January (29.7°F).

  • Average low temperature in October: 48.9°F

The month with the highest average low temperature is July (67.8°F).
The coldest month (with the lowest average low temperature) is January (20.7°F).

Average pressure in October
Chicago, IL

Average pressure in October - Chicago, IL
  • Average pressure in October: 30"Hg

The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

Average wind speed in October
Chicago, IL

Average wind speed in October - Chicago, IL
  • Average wind speed in October: 11.3mph

The windiest month (with the highest average wind speed) is January (12.5mph).
The calmest month (with the lowest average wind speed) is July (7.7mph).

Average humidity in October
Chicago, IL

Average humidity in October - Chicago, IL
  • Average humidity in October: 73%

The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is October (73%).

Average rainfall in October
Chicago, IL

Average rainfall in October - Chicago, IL
  • Average rainfall in October: 3.11"

The wettest month (with the highest rainfall) is June (4.88").
The driest month (with the least rainfall) is December (1.65").

Average rainfall days in October
Chicago, IL

Average rainfall days in October - Chicago, IL
  • Average rainfall days in October: 14.2 days

The month with the highest number of rainy days is July (18.5 days).
The month with the least rainy days is February (5.5 days).

Average snowfall in October
Chicago, IL

Average snowfall in October - Chicago, IL
  • Average snowfall in October: 0"

The month with the highest snowfall is February (3.54").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days in October
Chicago, IL

Average snowfall days in October - Chicago, IL
  • Average snowfall days in October: 0.2 days

The month with the highest number of snowfall days is January (10.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average sea temperature in October
Chicago, IL

Average sea temperature in October - Chicago, IL
  • Average sea temperature in October: 58.9°F

The best month for swimming (with the highest average sea temperature) is August (73.9°F).
The coldest month (with the lowest average sea temperature) is February (36.9°F).

Average daylight in October /
Average sunshine in October
Chicago, IL

Average daylight in October / Average sunshine in October - Chicago, IL
  • Average daylight in October: 11h and 1min

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in October: 5h and 5min

The months with the most sunshine are July and August (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).

Average sunshine days in October
Chicago, IL

Average sunshine days in October - Chicago, IL
  • Average sunshine days in October: 14.2 days

The month with the most sunshine days is December (15.5 days).
The month with the least sunshine days is July (9.3 days).

Average UV index in October
Chicago, IL

Average UV index in October - Chicago, IL
  • Average UV index in October: 2

The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).

Average cloud cover in October
Chicago, IL

Average cloud cover in October - Chicago, IL
  • Average cloud cover in October: 41

The month with the most cloud cover is January (Cloud cover 62).
The months with the least cloud cover are July and August (Cloud cover 27).

Average visibility in October
Chicago, IL

Average visibility in October - Chicago, IL
  • Average visibility in October: 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).

Chicago, Illinois, USA

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