Live Weather & Forecast

Weather in Summit

Q: What is the current weather in Summit?

Current conditions in Summit: Partly cloudy, temperature 26°C, humidity 48%.

Q: What is the best time to visit Summit?

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

Q: What are the GPS coordinates used for the weather forecast in Summit?

The weather forecast for Summit uses coordinates 41.7881, -87.8103.

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

26^°C

Feels like 27°C

78°F / Feels 80°F

Partly cloudy

Summit, Illinois

🌞 Daytime

Updated: 2026-04-12 12:15

💧

Humidity

48%

💨

Wind

25.2 km/h SSW

🌬️

Wind Gust

29 km/h

🌡️

Pressure

1014 mb

👁️

Visibility

16 km

☀️

UV Index

5.8 (Moderate)

🌧️

Precipitation

0 mm

☁️

Cloud Cover

75%

💦

Dew Point

17°C

🌐

Wind Degree

209°

Air Quality Index

US EPA: Good UK DEFRA: Low (1)

171.9 μg/m³

NO₂

6.9 μg/m³

O₃

110 μg/m³

SO₂

2.8 μg/m³

PM 2.5

7.9 μg/m³

PM 10

8.4 μg/m³

Weather Alerts 4

Met · Severe · Immediate

Flood Warning issued April 11 at 9:24PM CDT until April 14 at 7:00PM CDT by NWS Chicago IL

...The Flood Warning continues for the following rivers in Illinois...Indiana... Fox River at Algonquin Lock & Dam tailwater affecting Lake IL, McHenry and Kane Counties. Kankakee River at Dunns Bridge affecting Jasper and Porter Counties. Kankakee River at Shelby affecting Newton and Lake IN Counties. ...The Flood Warning is extended for the following rivers in Illinois... Des Plaines River...

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: 2026-04-11T21:24:00-05:00 · Expires: 2026-04-12T15:30:00-05:00

Met · Severe · Immediate

Flood Warning issued April 11 at 9:24PM CDT until April 14 at 1:00AM CDT by NWS Chicago IL

Effective: 2026-04-11T21:24:00-05:00 · Expires: 2026-04-12T15:30:00-05:00

Met · Severe · Immediate

Flood Warning issued April 11 at 9:24PM CDT until April 14 at 7:00PM CDT by NWS Chicago IL

Effective: 2026-04-11T21:24:00-05:00 · Expires: 2026-04-12T15:30:00-05:00

Met · Severe · Immediate

Flood Warning issued April 11 at 9:24PM CDT until April 12 at 10:00PM CDT by NWS Chicago IL

Effective: 2026-04-11T21:24:00-05:00 · Expires: 2026-04-12T15:30:00-05:00

Today's Hourly Forecast

24-hour breakdown for Summit, Illinois

12 AM

10°

Clear

💧 77% 💨 14.8 km/h

1 AM

10°

Clear

💧 72% 💨 13.3 km/h

2 AM

10°

Clear

💧 74% 💨 13.3 km/h

3 AM

10°

Clear

💧 74% 💨 14.4 km/h

4 AM

11°

Clear

💧 76% 💨 14.8 km/h

5 AM

11°

Clear

💧 80% 💨 15.5 km/h

6 AM

12°

Clear

💧 83% 💨 17.6 km/h

7 AM

13°

Sunny

💧 85% 💨 18.7 km/h

8 AM

15°

Sunny

💧 81% 💨 20.2 km/h

9 AM

17°

Sunny

💧 77% 💨 20.9 km/h

10 AM

21°

Sunny

💧 73% 💨 22.3 km/h

11 AM

24°

Sunny

💧 65% 💨 24.1 km/h

12 PM

26°

Partly cloudy

💧 48% 💨 25.2 km/h

1 PM

28°

Sunny

💧 43% 💨 25.6 km/h

2 PM

28°

Sunny

💧 39% 💨 24.5 km/h

3 PM

29°

Sunny

💧 38% 💨 25.2 km/h

4 PM

27°

Sunny

💧 38% 💨 22.3 km/h

5 PM

25°

Overcast

💧 58% 💨 20.5 km/h

6 PM

23°

Overcast

💧 65% 💨 12.2 km/h

7 PM

22°

Overcast

💧 76% 💨 15.5 km/h

8 PM

22°

Cloudy

💧 67% 💨 21.6 km/h

9 PM

21°

Overcast

💧 67% 💨 23.8 km/h

10 PM

19°

Overcast

💧 72% 💨 23.8 km/h

11 PM

18°

Overcast

💧 96% 💨 27.7 km/h

3-Day Forecast

Daily overview for Summit, Illinois

Today

Sunny

30° / 10°

🌧️ 0% chance of rain

💧 Avg. humidity: 68%

💨 Max wind: 27.7 km/h

🌧️ Total precip: 0 mm

☀️ UV Index: 1.1

🌅 Sunrise: 06:15 AM

🌇 Sunset: 07:29 PM

🌙 Waning Crescent

🌑 Moon: 33% lit

Mon, Apr 13

Moderate rain

23° / 16°

🌧️ 87% chance of rain

💧 Avg. humidity: 88%

💨 Max wind: 23.4 km/h

🌧️ Total precip: 19.74 mm

☀️ UV Index: 1.1

🌅 Sunrise: 06:14 AM

🌇 Sunset: 07:30 PM

🌙 Waning Crescent

🌑 Moon: 23% lit

Tue, Apr 14

Thundery outbreaks in nearby

25° / 19°

🌧️ 0% chance of rain

💧 Avg. humidity: 85%

💨 Max wind: 29.9 km/h

🌧️ Total precip: 0 mm

☀️ UV Index: 0.9

🌅 Sunrise: 06:12 AM

🌇 Sunset: 07:31 PM

🌙 Waning Crescent

🌑 Moon: 15% lit

Best Time to Visit Summit

Plan your trip to Summit, United States around the most favorable weather conditions.

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 Summit 🗓 View Holidays 2026

Frequently Asked Questions

What is the current weather in Summit?

Current conditions in Summit: Partly cloudy, temperature 26°C, humidity 48%.

What is the best time to visit Summit?

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

What is the climate like in Summit?

Summit is located at approximately 41.8° latitude. It has a temperate climate with warm summers and cold winters.

Does it rain a lot in Summit?

The wettest period in Summit is typically during November – March. Cooler temperatures; some regions may experience rain or snow.

What should I pack for a trip to Summit?

For visits to Summit during June – September: light clothing and sun protection. For November – March: layers and a waterproof jacket are recommended.

What country is Summit in?

Summit is located in United States, in the state of Illinois.

What are the public holidays in Summit in 2026?

View the 2026 public holidays for Summit on our Holidays page.

What are the GPS coordinates used for the weather forecast in Summit?

The weather forecast for Summit uses coordinates 41.7881, -87.8103.