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Over 250 million face dangerous heat dome into 4th of July weekend. Click for details.

Crystal Lake, IA

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Crystal Lake, IA Weather

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5 PM

89°

RealFeel® 98°

Hot

RealFeel Guide

Hot

90° to 100°

Caution advised. Possible danger of dehydration, heat stroke, heat exhaustion and heat cramps if outside for extended periods, and especially while doing strenuous activities.

7%

Intermittent clouds

Extreme Heat Warning

12:00 PM Monday - 10:00 PM Wednesday

RealFeel Shade™94°

Heat Index102°

WindS 21 mph

Air QualityFair

Max UV Index3.5 (Moderate)

Wind Gusts40 mph

Humidity69%

Indoor Humidity69% (Extremely Humid)

Dew Point77° F

AccuLumen Brightness Index™7 (Bright)

Cloud Cover53%

Visibility10 mi

Cloud Ceiling33300 ft

6 PM

88°

RealFeel® 95°

Hot

RealFeel Guide

Hot

90° to 100°

Caution advised. Possible danger of dehydration, heat stroke, heat exhaustion and heat cramps if outside for extended periods, and especially while doing strenuous activities.

7%

Mostly cloudy

Extreme Heat Warning

12:00 PM Monday - 10:00 PM Wednesday

RealFeel Shade™93°

Heat Index99°

WindS 20 mph

Air QualityFair

Max UV Index1.8 (Low)

Wind Gusts41 mph

Humidity67%

Indoor Humidity67% (Extremely Humid)

Dew Point76° F

AccuLumen Brightness Index™5 (Medium)

Cloud Cover76%

Visibility10 mi

Cloud Ceiling30000 ft

7 PM

88°

RealFeel® 94°

Hot

RealFeel Guide

Hot

90° to 100°

Caution advised. Possible danger of dehydration, heat stroke, heat exhaustion and heat cramps if outside for extended periods, and especially while doing strenuous activities.

10%

Mostly cloudy

Extreme Heat Warning

12:00 PM Monday - 10:00 PM Wednesday

RealFeel Shade™93°

Heat Index99°

WindS 18 mph

Air QualityFair

Max UV Index1.0 (Low)

Wind Gusts38 mph

Humidity68%

Indoor Humidity68% (Extremely Humid)

Dew Point76° F

AccuLumen Brightness Index™4 (Dull)

Cloud Cover76%

Visibility10 mi

Cloud Ceiling30000 ft

8 PM

86°

RealFeel® 91°

Hot

RealFeel Guide

Hot

90° to 100°

Caution advised. Possible danger of dehydration, heat stroke, heat exhaustion and heat cramps if outside for extended periods, and especially while doing strenuous activities.

15%

Partly sunny

Extreme Heat Warning

12:00 PM Monday - 10:00 PM Wednesday

RealFeel Shade™91°

Heat Index96°

WindS 18 mph

Air QualityFair

Max UV Index0.5 (Low)

Wind Gusts35 mph

Humidity71%

Indoor Humidity71% (Extremely Humid)

Dew Point76° F

AccuLumen Brightness Index™3 (Dull)

Cloud Cover45%

Visibility10 mi

Cloud Ceiling30000 ft

9 PM

84°

RealFeel® 90°

Hot

RealFeel Guide

Hot

90° to 100°

Caution advised. Possible danger of dehydration, heat stroke, heat exhaustion and heat cramps if outside for extended periods, and especially while doing strenuous activities.

15%

Partly cloudy

Extreme Heat Warning

12:00 PM Monday - 10:00 PM Wednesday

Heat Index94°

WindSSW 17 mph

Air QualityFair

Wind Gusts32 mph

Humidity76%

Indoor Humidity76% (Extremely Humid)

Dew Point76° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover45%

Visibility10 mi

Cloud Ceiling30000 ft

10 PM

83°

RealFeel® 89°

Very Warm

RealFeel Guide

Very Warm

82° to 89°

Older adults, infants, and those with sensitive medical conditions should minimize outdoor activity, especially in the sunshine.

19%

Partly cloudy

Extreme Heat Warning

12:00 PM Monday - 10:00 PM Wednesday

Heat Index91°

WindSSW 16 mph

Air QualityFair

Wind Gusts28 mph

Humidity79%

Indoor Humidity79% (Extremely Humid)

Dew Point76° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover45%

Visibility10 mi

Cloud Ceiling30000 ft

11 PM

81°

RealFeel® 81°

Pleasant

RealFeel Guide

Pleasant

63° to 81°

Most consider this temperature range ideal.

51%

Partly cloudy w/ t-storms

Extreme Heat Warning

12:00 PM Monday - 10:00 PM Wednesday

Heat Index86°

WindSSW 15 mph

Air QualityFair

Wind Gusts25 mph

Humidity85%

Indoor Humidity85% (Extremely Humid)

Dew Point76° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover45%

Rain0.20 in

Visibility3 mi

Cloud Ceiling30000 ft

Hourly Weather Forecast for Crystal Lake

AccuWeather's hourly forecast for Crystal Lake provides hour-by-hour temperatures, RealFeel® Temperature, and precipitation probability through the next 10 days. The current hour shows 89° with a RealFeel® of 98°, intermittent clouds with a 7% chance of precipitation. Each hourly forecast includes wind speed, humidity, air quality, UV index, and the AccuLumen Brightness Index™, AccuWeather's measure of perceived outdoor light intensity. Forecasts are generated by proprietary systems developed by AccuWeather meteorologists since 1962.

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