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Weather Tomorrow in Waukegan, IL

Flood WatchUntil Apr 4, 5:00 AM

Flood Watch issued April 3 at 3:56PM CDT until April 4 at 10:00AM CDT by NWS Chicago IL

A Flood Watch for flash flooding means rapid-onset flooding is possible, but not yet certain, based upon the latest forecasts. Flash flooding is a dangerous situation. Persons with interests along area rivers, creeks, and other waterways should monitor the latest forecasts and be prepared to take action should flooding develop.

Saturday, April 4, 2026

54°Low 40°FColdHot
Cloudy

Precip chance

93%

Wind

10-20 mph

Humidity

81%

Feels like

52–42°F

Rain forecast

Rain likely starts around 5 AM and may continue until 12 PM. Peak chance: 93% around 6 AM.

Data source: National Weather Service (NOAA) · Updated just now

Tomorrow by Hour

40°Temperature trend54°
TimeTempConditionRain %Wind
5 AM☽40°FShowers And Thunderstorms
88%
15 mph ENE
6 AM☽41°FShowers And Thunderstorms
93%
15 mph NE
7 AM☽42°FShowers And Thunderstorms
93%
15 mph ENE
8 AM☽42°FShowers And Thunderstorms
93%
10 mph ENE
9 AM☽43°FShowers And Thunderstorms
76%
10 mph E
10 AM☽44°FShowers And Thunderstorms Likely
58%
10 mph E
11 AM44°FChance Showers And Thunderstorms
51%
10 mph SE
12 PM46°FChance Rain Showers
43%
10 mph S
1 PM49°FChance Rain Showers
39%
10 mph SSW
2 PM52°FChance Rain Showers
34%
15 mph SW
3 PM54°FSlight Chance Rain Showers
22%
15 mph WSW
4 PM54°FCloudy
10%
20 mph WSW
5 PM54°FCloudy
8%
20 mph WSW
6 PM54°FMostly Cloudy
6%
20 mph WSW
7 PM54°FMostly Cloudy
4%
20 mph W
8 PM53°FMostly Cloudy
2%
20 mph W
9 PM52°FMostly Cloudy
0%
20 mph W
10 PM50°FMostly Cloudy
2%
20 mph W
11 PM☽48°FMostly Cloudy
6%
20 mph W
12 AM☽46°FMostly Cloudy
8%
20 mph W
1 AM☽44°FMostly Cloudy
8%
20 mph W
2 AM☽44°FMostly Cloudy
8%
20 mph W
3 AM☽42°FMostly Cloudy
8%
20 mph W
4 AM☽41°FMostly Cloudy
8%
15 mph W

Precipitation Timeline

100%
50%
93%
5a11a5p11p
<20%20-50%50-70%>70%

What to Wear Tomorrow

Cool weather — layer up

Clothing

  • • Long-sleeve shirt
  • • Light jacket or vest

Footwear

Water-resistant shoes

Accessories

  • • Umbrella
  • • Rain jacket

Conditions

High: 54°F

Low: 40°F

Wind: 10-20 mph

Rain: 93%

Rain expected around 5 AM — carry an umbrella.

Best Time to Be Outside Tomorrow

7 PM – 8 PM68

Good conditions for being outside (dry, daylight)

5a11a5p11p

More for Waukegan, IL

More cities in Illinois

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Frequently Asked Questions

What is the weather forecast for tomorrow in Waukegan, IL?
Tomorrow in Waukegan: High of 54°F, Low of 40°F. Cloudy with 93% chance of precipitation. Wind 10-20 mph.
Will it rain tomorrow in Waukegan?
Rain likely starts around 5 AM and may continue until 12 PM. Peak chance: 93% around 6 AM.
What should I wear tomorrow in Waukegan?
With a high of 54°F and low of 40°F, check our "What to Wear" section above for specific clothing recommendations based on temperature, wind, and precipitation.
How accurate is this forecast?
Our forecasts come directly from the National Weather Service (NOAA), which provides some of the most accurate weather predictions available. Tomorrow forecasts are generally 80-90% accurate, with accuracy decreasing the further out you look. Data is refreshed every 30 minutes.