The best times to visit Waukegan for ideal weather are

May 14th to October 7th

based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.



Other Waukegan Travel Info

Weather in Waukegan


Average temperatures in Waukegan vary drastically. Considering humidity, temperatures feel cold for about half of the year and otherwise nice with a fair chance of precipitation about half of the year. The area is less temperate than some — in the 33rd percentile for pleasant weather — compared to tourist destinations worldwide. Weeks with ideal weather are listed above. If you’re looking for the very warmest time to visit Waukegan, the hottest months are July, August, and then June. See average monthly temperatures below. The warmest time of year is generally mid July where highs are regularly around 83.7°F (28.7°C) with temperatures rarely dropping below 64.1°F (17.8°C) at night.

Waukegan Temperatures (Fahrenheit)


Waukegan Temperatures (Celsius)


“Feels-Like” Temperatures

The way we experience weather isn’t all about temperature. Higher temperatures affect us much more at higher humidity, and colder temperatures feel piercing with high winds. Our perceived temperatures factor in humidity and wind chill to better represent how hot or cold the day feels to a person.

Waukegan Perceived Temperature (F)


Waukegan Perceived Temperature (C)



Average Waukegan Temperatures by Month

Daily highs (averaged for the month) usually give the best indication of the weather. A significantly lower mean and low generally just means it gets colder at night.

Show Fahrenheit

Month Avg. High (°F) Avg. Mean (°F) Avg. Low (°F)
Jan 30.7 22.4 14.6
Feb 31 22.9 15.3
Mar 45.2 35.8 27.7
Apr 56.5 45.6 36.7
May 68.9 57.1 46.8
Jun 77.4 66.3 56.5
Jul 82 71.8 62
Aug 80.4 70.5 61.5
Sep 73.5 63.2 53.8
Oct 61.8 52.1 43.3
Nov 48.9 39.9 31.7
Dec 36.4 29 21.7

Show Celsius

Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
Jan -0.7 -5.3 -9.7
Feb -0.6 -5.1 -9.3
Mar 7.3 2.1 -2.4
Apr 13.6 7.6 2.6
May 20.5 13.9 8.2
Jun 25.2 19.1 13.6
Jul 27.8 22.1 16.7
Aug 26.9 21.4 16.4
Sep 23.1 17.3 12.1
Oct 16.6 11.2 6.3
Nov 9.4 4.4 -0.2
Dec 2.4 -1.7 -5.7



Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Waukegan are January, November, and then February. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around mid January. For example, on the week of January 15th there are no days of precipitation on average. By contrast, it’s most likely to rain or snow in early to mid May with an average of 2 days of significant precipitation the week of May 7th.

When can you find snow in Waukegan? Weather stations report no annual snow. Please note that a value of 0 for snow in the graph below may either mean there was no snow, or that snow is unreported.

Chance of Precipitation

The graph below shows the % chance of rainy and snowy days in Waukegan.

Days with precipitation

Snow on the Ground

The graph below shows the average snow on the ground in Waukegan (in).

Snow depth

Average Rain and Snow by Month

Show Inches

Month Daily Chance of Rain Average Snow Depth (in) Total Precipitation (in)
Jan 10% 0 1.2
Feb 13% 0 1.6
Mar 17% 0 2.2
Apr 27% 0 4.4
May 22% 0 3.5
Jun 29% 0 4.8
Jul 17% 0 4.2
Aug 23% 0 3.7
Sep 20% 0 3.4
Oct 20% 0 3
Nov 13% 0 1.9
Dec 20% 0 2.8

Show Centimeters

Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
Jan 10 0 3
Feb 13 0 4.1
Mar 17 0 5.6
Apr 27 0 11.2
May 22 0 8.9
Jun 29 0 12.2
Jul 17 0 10.7
Aug 23 0 9.4
Sep 20 0 8.6
Oct 20 0 7.6
Nov 13 0 4.8
Dec 20 0 7.1


Humidity and Wind

Waukegan has some high humidity months, with other comfortably humid months. The least humid month is April (57.8% relative humidity), and the most humid month is December (69.2%).

Wind in Waukegan is usually calm. The windiest month is April, followed by January and November. April’s average wind speed of around 8.1 knots (9.3 MPH or 14.9 KPH) is considered “a gentle breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in early to mid April where average top sustained speeds reach 15 knots, which is considered a moderate breeze.

Relative Humidity (%)

The graph below shows the average % humidity by month in Waukegan.

Avg. Relative Humidity


The graph below shows wind speed (max and average) in knots.

Max Sustained Wind
Average Daily Wind

Average Wind Speeds

Show Wind Speeds

All wind speeds are in knots. 1 knot = 1.15 MPH or 1.85 KPH.

Month Avg. Wind Avg. Wind Feel Sustained High Wind High Wind Feel
Jan 7.7 Gentle breeze 13.6 Significant breeze
Feb 7.4 Gentle breeze 13.3 Significant breeze
Mar 7.4 Gentle breeze 13.6 Significant breeze
Apr 8.1 Gentle breeze 14.7 Significant breeze
May 6.9 Light breeze 13.3 Significant breeze
Jun 5.7 Light breeze 12.6 Significant breeze
Jul 5 Light breeze 11.4 Significant breeze
Aug 4.7 Light breeze 10.6 Gentle breeze
Sep 5.3 Light breeze 11.2 Significant breeze
Oct 6.5 Light breeze 12.5 Significant breeze
Nov 7.4 Gentle breeze 13.5 Significant breeze
Dec 7.3 Gentle breeze 13.3 Significant breeze

Show Relative Humidity by Month

Month Avg. Relative Humidity
Jan 61.3%
Feb 61.2%
Mar 60.8%
Apr 57.8%
May 59.1%
Jun 65.2%
Jul 63.8%
Aug 67.9%
Sep 67.4%
Oct 63.1%
Nov 60.7%
Dec 69.2%


Is it Safe to Travel to Waukegan?

Our best data indicates this area is generally safe. As of Oct 07, 2019 there are no travel advisories or warnings for the United States; exercise normal security precautions. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories. This advisory was last updated on Sep 23, 2019.


The Busiest and Least Crowded Months

The busiest month for tourism in Waukegan, IL, US is July, followed by June and May. Prices for hotels and flights will be most expensive during these months, though you can save if you purchase well in advance. Tourists are unlikely to visit Waukegan in November. Those willing to visit at these times will likely find it the least expensive month.

Estimated Tourism by Month


Most Popular Months to Visit

Tourists Seeking Accommodations

Tourism graph is based on Google searches for services used by tourists relative to the rest of the year. Tourism data for this area is somewhat extrapolated based on nearby areas. Displayed data is calculated relative to the peak, so a score of 47.4 in November means 47.4% of the tourists vs. July.



Overall Waukegan Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel moderately cold. Highs range from 73.9°F (23.3°C) and 32.8°F (0.4°C) with warmer temperatures in the later months. Rain is somewhat common with 5 to 8 days of significant precipitation per month. Spring is the second busiest for tourism, which makes it a good time for those looking for things to do.

Summer (June through August)

The middle-year months have very comfortable weather with high temperatures that are comfortable. These months see the most precipitation with 5 to 9 days of precipitation per month. June – August is the busiest season for tourism in Waukegan, so lodging and other accommodations may cost more than usual.

Fall (September through November)

Fall daily highs range from 77.3°F (25.2°C) and 41.6°F (5.3°C), which will feel chilly given the humidity and wind. It rains or snows a significant amount: 4 to 6 days per month. Tourism is the slowest during these months due to the weather, so hotels may be affordably priced.

Winter (December through February)

Weather is far too cold this time of year in Waukegan to be enjoyable for warm weather travelers. The average high during this season is between 37.3°F (2.9°C) and 29°F (-1.7°C). On average, it rains or snows a fair amount: 3 to 6 times per month. These times of year are fairly slow with tourists.


Best Times to Travelthe United States › Waukegan, IL, US