Chicago
Illinois, USA
Long-term weather forecast
Long-term weather forecast

October weather forecast and climate
Chicago, IL

An aerial view of the city of Chicago in Illinois, on the shores of Lake Michigan, with a superb view of the sandy beach of Oak Street
An aerial view of the city of Chicago in Illinois, on the shores of Lake Michigan, with a superb view of the sandy beach of Oak Street
October is a pleasant autumn month in Chicago with warm to cold weather conditions. The average temperatures are in the 43°F (6.1°C) to 62°F (16.7°C) zone - most days are above 50°F (10°C), while a few nights may drop below freezing.
October receives an average of 189 hours of sunshine amid nine days with clear skies. Scenic byways and state parks are great places to view the fall foliage that peaks with brilliant shades of orange, yellow, and red between the second to fourth weeks of October.
Wear warm clothes as the nights tend to be frosty at times.

What is the temperature in October in Chicago?

The average high-temperature, in October, is 62.8°F (17.1°C), while the average low-temperature is 45.7°F (7.6°C).

What is the average humidity in October in Chicago?

In Chicago, Illinois, the average relative humidity in October is 68.6%.

How much does it rain in Chicago in October?

In October, in Chicago, Illinois, the rain falls for 10.2 days. Throughout October, 3.2" (82.3mm) of precipitation is accumulated.

When does it start snowing in Chicago?

October is the first month it typically snows in Chicago, Illinois. Throughout October, in the average 0.1 snowfall days, it receives 0.1" (2.5mm) of snow.

What is the ocean temperature 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 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 Chicago, Illinois, the average length of the day in October is 11.1h.

How many hours of sunshine does Chicago have in October?

The average sunshine in October in Chicago, Illinois, is 6.2h.

What is the UV index reading in October in Chicago?

In October, the average daily maximum UV index in Chicago, Illinois, is 4. A UV Index reading of 3 to 5 represents a moderate health threat from unsafe exposure to the Sun's UV rays.
Average temperature in October - Chicago, IL
  • Average high temperature in October: 17.1°C

The warmest month (with the highest average high temperature) is July (29°C).
The month with the lowest average high temperature is January (-0.3°C).

  • Average low temperature in October: 7.6°C

The month with the highest average low temperature is July (19.7°C).
The coldest month (with the lowest average low temperature) is January (-7.7°C).

Average humidity in October - Chicago, IL
  • Average humidity in October: 68.6%

The month with the highest relative humidity is December (75.5%).
The month with the lowest relative humidity is May (64.1%).

Average rainfall in October - Chicago, IL
  • Average rainfall in October: 82.3mm

The wettest month (with the highest rainfall) is May (104.9mm).
The driest month (with the lowest rainfall) is February (49.3mm).

Average rainfall days in October - Chicago, IL
  • Average rainfall days in October: 10.2 days

The month with the highest number of rainy days is May (11.4 days).
The month with the lowest number of rainy days is September (8.2 days).

Average snowfall in October - Chicago, IL
  • Average snowfall in October: 2.5mm

The month with the highest snowfall is January (292.1mm).
Months with the lowest snowfall are May, June, July, August and September (0mm).

Average snowfall days in October - Chicago, IL
  • Average snowfall days in October: 0.1 days

The month with the highest number of snowfall days is January (8.1 days).
Months with the lowest number of snowfall days are May, June, July, August and September (0 days).

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).

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 shortest days is December (Average daylight: 9.2h).

  • Average sunshine in October: 6.2h

The month with most sunshine is June (Average sunshine: 10.4h).
The month with least sunshine is December (Average sunshine: 3.4h).

Average UV index in October - Chicago, IL
  • Average UV index in October: 4

Months with the highest UV index are June and July (UV index 9).
Months with the lowest UV index are January and December (UV index 1).