October weather forecast
Chicago, IL

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, the same as September, in Chicago, Illinois, is another mild autumn month, with an average temperature ranging between max 59.5°F (15.3°C) and min 48.9°F (9.4°C).

Temperature

In October, the average high-temperature decreases from a pleasant 71.1°F (21.7°C) in September to a mild 59.5°F (15.3°C). In Chicago, Illinois, in October, the average low-temperature is 48.9°F (9.4°C).

Humidity

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

Rainfall

In October, in Chicago, the rain falls for 14.2 days. Throughout October, 3.11" (79mm) of precipitation is accumulated. 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 in Chicago.

Ocean temperature

In Chicago, the average water temperature is 58.8°F (14.9°C).
Note: At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

Daylight

The average length of the day in October is 11h and 4min.
On the first day of October, sunrise is at 6:47 am and sunset at 6:32 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 5:46 pm CDT.

Sunshine

In October, the average sunshine in Chicago is 5.9h.

UV index

In October, the average daily maximum UV index in Chicago is 2. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for the average person.
Note: The average daily UV index of 2 in October transform into the following instructions:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in October in Chicago?

In October, the average high-temperature is 59.5°F (15.3°C), and 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?

In October, the average relative humidity in Chicago is 73%.

How much does it rain in Chicago in October?

In Chicago, in October, during 14.2 rainfall days, 3.11" (79mm) of precipitation is typically accumulated.

When it does not snow in Chicago?

June through October are months without snowfall in Chicago.

Does it snow in Chicago in October?

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

What is the water temperature in October in Chicago?

In October, the average ocean temperature in Chicago, Illinois, is 58.8°F (14.9°C). At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

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

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

When is the sunrise / sunset in October in Chicago?

On the first day of October in Chicago, sunrise is at 6:47 am and sunset at 6:32 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 5:46 pm CDT.

How many hours of sunshine does Chicago have in October?

In October, the average sunshine duration in Chicago is 5.9h.

What is the UV index reading in October in Chicago?

In October, the average daily maximum UV index in Chicago, Illinois, is 2. A UV Index of 2, and less, symbolizes a low health threat from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
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).

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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).

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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).

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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%).

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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").

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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).

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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").

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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).

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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).

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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 4min

The month with the longest days is June (Average daylight: 15h and 11min).
The month with the shortest days is December (Average daylight: 9h and 11min).

  • Average sunshine in October: 5h and 54min

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).

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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).

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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).

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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).

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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).

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