October weather forecastChicago, IL
October
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 October, the average high-temperature decreases from a pleasant 71.1°F (21.7°C) in September to a moderate 59.5°F (15.3°C). During the month of October, the nighttime temperature falls to an average of 48.9°F (9.4°C).Humidity
The least humid month is October, with an average relative humidity of 73%.Rainfall
In Chicago, Illinois, in October, it is raining for 14.2 days, with typically 3.11" (79mm) of accumulated precipitation. 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 Chicago, in October, the average water temperature is 58.8°F (14.9°C).Note: Swimming in 58.8°F (14.9°C) can be lethal. Merely spending a few minutes in 55.4°F (13°C) waters feels harsh, and venturing below 50°F (10°C) might disrupt breathing control and bring about cold shock, contingent on individual resilience.
Daylight
The average length of the day in October is 11h and 4min.On the first day of October, 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 is 5.9h.UV index
In October, the average daily maximum UV index is 2. A UV Index of 2, and less, symbolizes a low health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: In October, a daily UV index of 2 turns into the following recommendations:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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: 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: 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: 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: 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: 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: 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: 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: 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: 11h and 6min
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 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).
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: 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: 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: 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).
