Live Weather & Forecast

Weather in Illinois

Q: What is the current weather in Illinois?

Current conditions in Illinois: Overcast, temperature 17°C, humidity 90%.

Q: What is the best time to visit Illinois?

The best time to visit Illinois is typically June – September. Warm, dry summers — ideal for outdoor activities.

Q: What are the coordinates for the weather forecast in Illinois?

The weather forecast for Illinois is based on coordinates 41.9317, -87.989.

United States · Real-time conditions & 3-day outlook

17^°C

Feels like 17°C

63°F / Feels 63°F

Overcast

Illinois, United States

🌙 Nighttime

Updated: 2026-04-13 03:00

💧

Humidity

90%

💨

Wind

22.3 km/h SW

🌬️

Wind Gust

34.7 km/h

🌡️

Pressure

1009 mb

👁️

Visibility

16 km

☀️

UV Index

0 (Low)

🌧️

Precipitation

0 mm

☁️

Cloud Cover

100%

💦

Dew Point

15°C

🌐

Wind Degree

235°

Air Quality Index

US EPA: Good UK DEFRA: Low (1)

163.9 μg/m³

NO₂

11 μg/m³

O₃

84 μg/m³

SO₂

4 μg/m³

PM 2.5

6.3 μg/m³

PM 10

6.5 μg/m³

Weather Alerts 2

Met · Severe · Immediate

Flood Warning issued April 12 at 10:46AM CDT until April 14 at 7:00PM CDT by NWS Chicago IL

...The Flood Warning continues for the following rivers in Illinois... Fox River at Algonquin Lock & Dam tailwater affecting Kane, McHenry and Lake IL Counties. For the Fox River (Illinois)...including Algonquin Lock & Dam tailwater...Minor flooding is occurring. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Fox River from Johnsburg downstream to Red Gate Road...

A Flood Warning means water levels above flood stage are imminent or may already be occurring. Persons along rivers and streams in the warned area should take immediate precautions to protect life and property. These forecasts are based on observed precipitation as well as forecast precipitation...

Effective: 2026-04-12T10:46:00-05:00 · Expires: 2026-04-13T05:00:00-05:00

Met · Severe · Immediate

Flood Warning issued April 12 at 9:04PM CDT until April 14 at 7:00PM CDT by NWS Chicago IL

...The Flood Warning continues for the following rivers in Indiana... Illinois... Kankakee River at Shelby affecting Lake IN and Newton Counties. Fox River at Algonquin Lock & Dam tailwater affecting Kane, McHenry and Lake IL Counties. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Fox River from Johnsburg downstream to Red Gate Road in St. Charles, including th...

Effective: 2026-04-12T21:04:00-05:00 · Expires: 2026-04-13T15:15:00-05:00

Today's Hourly Forecast

24-hour breakdown for Illinois, United States

12 AM

17°

Light rain

💧 89% 💨 24.8 km/h 🌧️ 100%

1 AM

17°

Partly Cloudy

💧 89% 💨 22.3 km/h

2 AM

17°

Partly Cloudy

💧 90% 💨 22.3 km/h

3 AM

17°

Overcast

💧 90% 💨 22.3 km/h

4 AM

17°

Overcast

💧 90% 💨 21.2 km/h

5 AM

18°

Overcast

💧 91% 💨 19.8 km/h

6 AM

18°

Overcast

💧 91% 💨 19.1 km/h

7 AM

18°

Cloudy

💧 92% 💨 18.4 km/h

8 AM

18°

Overcast

💧 93% 💨 14.8 km/h

9 AM

19°

Overcast

💧 94% 💨 14 km/h

10 AM

19°

Overcast

💧 94% 💨 14.8 km/h

11 AM

20°

Overcast

💧 93% 💨 18 km/h

12 PM

20°

Overcast

💧 92% 💨 16.2 km/h

1 PM

21°

Thundery outbreaks in nearby

💧 87% 💨 18 km/h

2 PM

21°

Thundery outbreaks in nearby

💧 87% 💨 16.6 km/h

3 PM

21°

Thundery outbreaks in nearby

💧 86% 💨 13 km/h

4 PM

21°

Thundery outbreaks in nearby

💧 89% 💨 15.5 km/h

5 PM

22°

Thundery outbreaks in nearby

💧 86% 💨 15.8 km/h

6 PM

22°

Thundery outbreaks in nearby

💧 83% 💨 15.5 km/h

7 PM

22°

Thundery outbreaks in nearby

💧 84% 💨 19.1 km/h

8 PM

21°

Thundery outbreaks in nearby

💧 88% 💨 23.4 km/h

9 PM

21°

Thundery outbreaks in nearby

💧 88% 💨 23.4 km/h

10 PM

21°

Thundery outbreaks in nearby

💧 92% 💨 23 km/h

11 PM

20°

Overcast

💧 92% 💨 24.1 km/h

3-Day Forecast

Daily overview for Illinois, United States

Today

Patchy rain nearby

23° / 17°

🌧️ 74% chance of rain

💧 Avg. humidity: 90%

💨 Max wind: 24.8 km/h

🌧️ Total precip: 1.3 mm

☀️ UV Index: 0.9

🌅 Sunrise: 06:14 AM

🌇 Sunset: 07:31 PM

🌙 Waning Crescent

🌑 Moon: 23% lit

Tue, Apr 14

Patchy rain nearby

25° / 19°

🌧️ 57% chance of rain

💧 Avg. humidity: 88%

💨 Max wind: 24.8 km/h

🌧️ Total precip: 1.7 mm

☀️ UV Index: 1.6

🌅 Sunrise: 06:13 AM

🌇 Sunset: 07:32 PM

🌙 Waning Crescent

🌑 Moon: 15% lit

Wed, Apr 15

Moderate rain

22° / 20°

🌧️ 83% chance of rain

💧 Avg. humidity: 86%

💨 Max wind: 26.6 km/h

🌧️ Total precip: 16.78 mm

☀️ UV Index: 0.7

🌅 Sunrise: 06:11 AM

🌇 Sunset: 07:33 PM

🌙 Waning Crescent

🌑 Moon: 8% lit

Best Time to Visit Illinois

Plan your trip around the most favorable weather conditions in Illinois, United States.

Peak Season

June – September

Warm, dry summers — ideal for outdoor activities.

Shoulder Season

April – May, October

Fewer crowds, moderate prices, mild weather.

Off Season

November – March

Cooler temperatures; some regions may experience rain or snow.

← Back to Illinois 🗓 View Holidays 2026

Frequently Asked Questions

What is the current weather in Illinois?

Current conditions in Illinois: Overcast, temperature 17°C, humidity 90%.

What is the best time to visit Illinois?

The best time to visit Illinois is typically June – September. Warm, dry summers — ideal for outdoor activities.

What is the climate like in Illinois?

Illinois shares the climate of United States. It has a temperate climate with warm summers and cold winters.

Does it rain a lot in Illinois?

Rainfall patterns in Illinois vary by season. Peak rainfall typically occurs outside of the dry season.

What should I pack for Illinois?

For visits during June – September: light clothing and sun protection. For the November – March period: layers and a waterproof jacket are recommended for Illinois.

What country is Illinois in?

Illinois is a state/province of United States.

What are the public holidays in Illinois in 2026?

View the full list of 2026 public holidays for Illinois on our Holidays page.

What are the coordinates for the weather forecast in Illinois?

The weather forecast for Illinois is based on coordinates 41.9317, -87.989.