Live Weather & Forecast

Weather in Crystal Lake

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

Flag of United States
Overcast
9°C
Feels like 7°C
49°F / Feels 44°F
Overcast
Crystal Lake, Illinois
🌙 Nighttime
Updated: 2026-04-12 01:30
💧
Humidity
74%
💨
Wind
18.4 km/h SSE
🌬️
Wind Gust
33.6 km/h
🌡️
Pressure
1020 mb
👁️
Visibility
16 km
☀️
UV Index
0 (Low)
🌧️
Precipitation
0.01 mm
☁️
Cloud Cover
100%
💦
Dew Point
5.2°C
🌐
Wind Degree
151°

Air Quality Index

US EPA: Good UK DEFRA: Low (1)
CO
181.9 μg/m³
NO₂
4.7 μg/m³
O₃
87 μg/m³
SO₂
7.6 μg/m³
PM 2.5
11.4 μg/m³
PM 10
11.8 μg/m³

Weather Alerts 5

Met · Severe · Immediate
Flood Warning issued April 11 at 10:46AM CDT by NWS Chicago IL

...The Flood Warning continues for the following rivers in Illinois... Fox River at Algonquin Lock & Dam tailwater affecting Kane, Lake IL and McHenry 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: 2026-04-11T10:46:00-05:00  ·  Expires: 2026-04-12T05:00:00-05:00
Met · Severe · Immediate
Flood Warning issued April 11 at 9:24PM CDT until April 14 at 7:00PM CDT by NWS Chicago IL

...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 10:43AM CDT until April 12 at 7:00AM CDT by NWS Chicago IL

...The Flood Warning continues for the following rivers in Illinois... Des Plaines River near Gurnee affecting Lake IL County. Des Plaines River near Russell affecting Lake IL County. For the Des Plaines River...including Gurnee...Minor flooding is occurring. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Des Plaines River from IL/WI state line downstream to US...

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: 2026-04-11T10:43:00-05:00  ·  Expires: 2026-04-12T04:45:00-05:00
Met · Severe · Immediate
Flood Warning issued April 11 at 10:43AM CDT until April 12 at 1:00PM CDT by NWS Chicago IL

...The Flood Warning continues for the following rivers in Illinois... Des Plaines River near Gurnee affecting Lake IL County. Des Plaines River near Russell affecting Lake IL County. For the Des Plaines River...including Gurnee...Minor flooding is occurring. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Des Plaines River from US-41 in Gurnee downstream to Tow...

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: 2026-04-11T10:43:00-05:00  ·  Expires: 2026-04-12T04:45:00-05:00
Met · Severe · Immediate
Flood Warning issued April 11 at 9:24PM CDT until April 14 at 7:00PM CDT by NWS Chicago IL

...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

Today's Hourly Forecast

24-hour breakdown for Crystal Lake, Illinois

12 AM
Clear
8°
Clear
💧 76% 💨 16.6 km/h
1 AM
Overcast
9°
Overcast
💧 74% 💨 18.4 km/h 🌧️ 86%
2 AM
Patchy rain nearby
10°
Patchy rain nearby
💧 78% 💨 19.8 km/h 🌧️ 69%
3 AM
Clear
10°
Clear
💧 76% 💨 21.2 km/h
4 AM
Patchy rain nearby
11°
Patchy rain nearby
💧 78% 💨 21.6 km/h 🌧️ 84%
5 AM
Clear
11°
Clear
💧 83% 💨 18.4 km/h
6 AM
Clear
12°
Clear
💧 87% 💨 18.4 km/h
7 AM
Sunny
13°
Sunny
💧 89% 💨 20.9 km/h
8 AM
Sunny
15°
Sunny
💧 88% 💨 23.4 km/h
9 AM
Sunny
17°
Sunny
💧 84% 💨 27 km/h
10 AM
Sunny
19°
Sunny
💧 80% 💨 30.2 km/h
11 AM
Sunny
20°
Sunny
💧 78% 💨 34.2 km/h
12 PM
Cloudy
21°
Cloudy
💧 76% 💨 35.6 km/h
1 PM
Cloudy
22°
Cloudy
💧 71% 💨 38.2 km/h
2 PM
Overcast
21°
Overcast
💧 68% 💨 34.9 km/h
3 PM
Overcast
22°
Overcast
💧 76% 💨 32.8 km/h
4 PM
Overcast
22°
Overcast
💧 70% 💨 32.4 km/h
5 PM
Overcast
21°
Overcast
💧 74% 💨 29.5 km/h
6 PM
Overcast
20°
Overcast
💧 76% 💨 28.1 km/h
7 PM
Overcast
19°
Overcast
💧 90% 💨 32.8 km/h
8 PM
Overcast
18°
Overcast
💧 98% 💨 28.4 km/h
9 PM
Overcast
18°
Overcast
💧 98% 💨 35.6 km/h
10 PM
Heavy rain
18°
Heavy rain
💧 96% 💨 35.3 km/h 🌧️ 100%
11 PM
Overcast
17°
Overcast
💧 96% 💨 29.2 km/h

3-Day Forecast

Daily overview for Crystal Lake, Illinois

Today
Moderate rain
Moderate rain
23° / 8°
🌧️ 86% chance of rain
💧 Avg. humidity: 82%
💨 Max wind: 38.2 km/h
🌧️ Total precip: 10.21 mm
☀️ UV Index: 0.8
🌅 Sunrise: 06:17 AM
🌇 Sunset: 07:32 PM
🌙 Waning Crescent
🌑 Moon: 33% lit
Mon, Apr 13
Patchy rain nearby
Patchy rain nearby
25° / 16°
🌧️ 69% chance of rain
💧 Avg. humidity: 87%
💨 Max wind: 31 km/h
🌧️ Total precip: 2.35 mm
☀️ UV Index: 1.1
🌅 Sunrise: 06:15 AM
🌇 Sunset: 07:33 PM
🌙 Waning Crescent
🌑 Moon: 23% lit
Tue, Apr 14
Thundery outbreaks in nearby
Thundery outbreaks in nearby
25° / 19°
🌧️ 0% chance of rain
💧 Avg. humidity: 90%
💨 Max wind: 32.4 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 0.8
🌅 Sunrise: 06:14 AM
🌇 Sunset: 07:34 PM
🌙 Waning Crescent
🌑 Moon: 15% lit

Best Time to Visit Crystal Lake

Plan your trip to Crystal Lake, 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 Crystal Lake 🗓 View Holidays 2026

Frequently Asked Questions

People also ask — answers optimized for search engines and voice queries.

What is the current weather in Crystal Lake?
Current conditions in Crystal Lake: Overcast, temperature 9°C, humidity 74%.
What is the best time to visit Crystal Lake?
The best time to visit Crystal Lake is typically June – September. Warm, dry summers — ideal for outdoor activities.
What is the climate like in Crystal Lake?
Crystal Lake is located at approximately 42.2° latitude. It has a temperate climate with warm summers and cold winters.
Does it rain a lot in Crystal Lake?
The wettest period in Crystal Lake is typically during November – March. Cooler temperatures; some regions may experience rain or snow.
What should I pack for a trip to Crystal Lake?
For visits to Crystal Lake during June – September: light clothing and sun protection. For November – March: layers and a waterproof jacket are recommended.
What country is Crystal Lake in?
Crystal Lake is located in United States, in the state of Illinois.
What are the public holidays in Crystal Lake in 2026?
View the 2026 public holidays for Crystal Lake on our Holidays page.
What are the GPS coordinates used for the weather forecast in Crystal Lake?
The weather forecast for Crystal Lake uses coordinates 42.2411, -88.3162.