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Grayslake, United States Snapshot 2026
Where is Grayslake?
Grayslake, United States
- Continent
- Americas
- Country
- United States
- City
- Grayslake
- Population
- 20.9K
- Elevation
- 239 m
- Coordinates
- 42.34°, -88.04°
Grayslake is a city in United States with a population of approximately 20.9K. Average temperatures range from -6°C (21°F) in January to 26°C (79°F) in July. The best time to visit is June, July, August, September, October. The city sits at an elevation of 239 m above sea level.
Time in Grayslake right now
Open full time & time zone page 14:23 23
Monday, June 15, 2026
IANA time zone
America/Chicago
Daylight saving
DST in effect
CST / CDT
Next DST change
November 1
backward -1h
Live weather in Grayslake
Daylight in Grayslake today
View full sunrise & sunset page Sunrise
Sunset
Day length
15h 16m
Climate normals for Grayslake
Long-term monthly averages based on historical data.
January
Poor 
February
Poor March
Poor April
Poor May
Good June best
Excellent July best
Excellent August best
Excellent September best
Excellent October best
Good November
Poor December
Poor | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 0°C / -6°C | -5°C / -12°C | 9days (65 mm) Wet | 5.1h Fair | 74% Muggy | 2.1 Moderate | Poor | View Details |
| February | 2°C / -5°C | -3°C / -11°C | 8days (53 mm) Wet | 6.9h Fair | 70% Muggy | 3.4 Moderate | Poor | View Details |
| March | 7°C / 0°C | 3°C / -5°C | 11days (88 mm) Wet | 7.8h Good | 70% Muggy | 4.4 Moderate | Poor | View Details |
| April | 12°C / 4°C | 9°C / 0°C | 13days (113 mm) Wet | 8.9h Good | 70% Muggy | 5.3 High | Poor | View Details |
| May | 18°C / 10°C | 17°C / 7°C | 13days (121 mm) Wet | 10.3h Excellent | 74% Muggy | 6.5 High | Good | View Details |
| June best | 24°C / 16°C | 25°C / 16°C | 12days (90 mm) Wet | 11.9h Excellent | 73% Muggy | 7 High | Excellent | View Details |
| July best | 26°C / 20°C | 29°C / 21°C | 10days (89 mm) Wet | 12.1h Excellent | 76% Humid | 7 High | Excellent | View Details |
| August best | 26°C / 19°C | 28°C / 20°C | 10days (79 mm) Wet | 11.4h Excellent | 75% Muggy | 6.4 High | Excellent | View Details |
| September best | 23°C / 17°C | 24°C / 16°C | 10days (74 mm) Wet | 9.6h Good | 73% Muggy | 5.3 High | Excellent | View Details |
| October best | 16°C / 10°C | 14°C / 7°C | 10days (102 mm) Wet | 7.3h Good | 70% Muggy | 3.7 Moderate | Good | View Details |
| November | 8°C / 3°C | 5°C / -2°C | 8days (56 mm) Wet | 6.1h Fair | 70% Muggy | 2.4 Moderate | Poor | View Details |
| December | 3°C / -3°C | -2°C / -8°C | 9days (59 mm) Wet | 5.1h Fair | 73% Muggy | 1.8 Low | Poor | View Details |
Monthly Temperatures
HighLow
Line chart showing monthly temperatures. Jan: 0°C / -6°C . Feb: 2°C / -5°C . Mar: 7°C / 0°C . Apr: 12°C / 4°C . May: 18°C / 10°C . Jun: 24°C / 16°C . Jul: 26°C / 20°C . Aug: 26°C / 19°C . Sep: 23°C / 17°C . Oct: 16°C / 10°C . Nov: 8°C / 3°C . Dec: 3°C / -3°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 65 mm. Feb: 53 mm. Mar: 88 mm. Apr: 113 mm. May: 121 mm. Jun: 90 mm. Jul: 89 mm. Aug: 79 mm. Sep: 74 mm. Oct: 102 mm. Nov: 56 mm. Dec: 59 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 74%. Feb: 70%. Mar: 70%. Apr: 70%. May: 74%. Jun: 73%. Jul: 76%. Aug: 75%. Sep: 73%. Oct: 70%. Nov: 70%. Dec: 73%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 23 km/h . Feb: 24 km/h . Mar: 23 km/h . Apr: 23 km/h . May: 20 km/h . Jun: 19 km/h . Jul: 17 km/h . Aug: 16 km/h . Sep: 19 km/h . Oct: 22 km/h . Nov: 23 km/h . Dec: 23 km/h .
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 2. Feb: UV 3. Mar: UV 4. Apr: UV 5. May: UV 7. Jun: UV 7. Jul: UV 7. Aug: UV 6. Sep: UV 5. Oct: UV 4. Nov: UV 2. Dec: UV 2.
Frequently Asked Questions
Grayslake has a population of approximately 20.9K.
The best months to visit Grayslake are June, July, August, September, October, when temperatures are pleasant and rainfall is lower.
Grayslake receives approximately 989mm of rainfall annually across 123 rainy days.
Grayslake is located in United States, in the Americas region.
Grayslake sits at an elevation of 239 m (784 ft) above sea level.