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, like September, is a moderate autumn month in Chicago, Illinois, with an average temperature ranging between min 48.9°F (9.4°C) and max 59.5°F (15.3°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). In Chicago, in October, the average low-temperature is 48.9°F (9.4°C).

Humidity

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

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 in Chicago.

Ocean temperature

In Chicago, Illinois, the average seawater temperature in October 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

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

Sunshine

The average sunshine in October in Chicago is 5.9h.

UV index

In Chicago, Illinois, the average daily maximum UV index in October is 2. A UV Index of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for ordinary individuals.
Note: The average daily UV index of 2 in October transform into the following instructions:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
[Resources]

FAQ

What is the least humid month in Chicago?

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

What is the average humidity in October in Chicago?

In October, the average relative humidity is 73%.

How much does it rain in Chicago in October?

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

When it does not snow in Chicago?

June through October are months without snowfall.

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 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 are sunrise and sunset in October in Chicago?

In October, on the first day of the month, sunrise is at 6:47 am and sunset at 6:32 pm. On the last day of the month, in Chicago, 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.

How high is the UV index in October in Chicago?

The average daily maximum UV index in October is 2. A UV Index value of 2, and less, symbolizes a minimal hazard to health from exposure to the Sun's UV radiation.

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).

[Resources]

Average pressure in October
Chicago, IL

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

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

[Resources]

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).

[Resources]

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%).

[Resources]

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").

[Resources]

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).

[Resources]

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").

[Resources]

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).

[Resources]

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).

[Resources]

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: 5.9h

The 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).

[Resources]

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).

[Resources]

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).

[Resources]

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).

[Resources]

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).

[Resources]

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location
* you will be automatically redirected to the weather forecast for your location