October weather forecast and climate
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 a moderate autumn month, with temperature in the range of an average high of 59.5°F (15.3°C) and an average low of 48.9°F (9.4°C).

Temperature

In October, the average high-temperature decreases, from an agreeable 71.1°F (21.7°C) in September, to a moderate 59.5°F (15.3°C). The average low-temperature, in October, 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. In Chicago, during the entire year, the rain falls for 160.2 days and collects up to 36.97" (939mm) of precipitation.

Snowfall

June through October are months without snowfall.

Ocean temperature

In October, the average ocean 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 Chicago, Illinois, is 11.1h.

Sunshine

The average sunshine in October is 5.9h.

UV index

The average daily maximum UV index in October is 2. A UV Index reading of 2, and below, represents a minimal health hazard from the exposure to the Sun's UV radiation for average individuals.
Note: The daily maximum UV index of 2 interpret into the following advice:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in October in Chicago?

The average high-temperature, in October, in Chicago, Illinois, 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?

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

What is the average humidity in October in Chicago?

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

How many days does it rain in October in Chicago?

In Chicago, Illinois, in October, it is raining for 14.2 days, with typically 3.11" (79mm) of accumulated precipitation.

Does it snow in Chicago in October?

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

When it does not snow in Chicago?

June through October are months without snowfall in Chicago.

How cold is the water in October in Chicago?

In Chicago, Illinois, in October, the average water temperature is 58.8°F (14.9°C). Swimming in 58.8°F (14.9°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

How many hours of daylight does Chicago have in October?

In Chicago, the average length of the day in October is 11.1h.

How long on average sun shines in October in Chicago?

The average sunshine in October in Chicago, Illinois, is 5.9h.

What is the UV index intensity in October in Chicago?

The average daily maximum UV index in October in Chicago is 2. A UV Index estimate of 2, and below, represents a low health threat from the exposure to the Sun's UV rays.

Average temperature in October
Chicago, IL

Average temperature in October - Chicago, IL
  • Average high temperature in October: 15.3°C

The warmest month (with the highest average high temperature) is August (25.3°C).
The month with the lowest average high temperature is January (-1.3°C).

  • Average low temperature in October: 9.4°C

The month with the highest average low temperature is July (19.9°C).
The coldest month (with the lowest average low temperature) is January (-6.3°C).

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Average pressure in October
Chicago, IL

Average pressure in October - Chicago, IL
  • Average pressure in October: 1016mbar

The month with the highest atmospheric pressure is January (1019.5mbar).
The month with the lowest atmospheric pressure is June (1013.3mbar).

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Average wind speed in October
Chicago, IL

Average wind speed in October - Chicago, IL
  • Average wind speed in October: 18.2km/h

The windiest month (with the highest average wind speed) is January (20.1km/h).
The calmest month (with the lowest average wind speed) is July (12.4km/h).

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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: 79mm

The wettest month (with the highest rainfall) is June (124mm).
The driest month (with the least rainfall) is December (42mm).

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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: 0mm

The month with the highest snowfall is February (90mm).
Months with the least snowfall are June, July, August, September and October (0mm).

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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).
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: 14.9°C

The best month for swimming (with the highest average sea temperature) is August (23.3°C).
The coldest month (with the lowest average sea temperature) is February (2.7°C).

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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: 11.1h

The month with the longest days is June (Average daylight: 15.2h).
The month with the shortest days is December (Average daylight: 9.2h).

  • Average sunshine in October: 5.9h

Months with the most sunshine are July and August (Average sunshine: 10.6h).
The month with the least sunshine is January (Average sunshine: 3.7h).

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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

Months with the highest UV index are July and August (UV index 6).
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).
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: 10km

Months with the highest visibility are September and October (10km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, November and December (9km).

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