Grayslake Weather History Illinois, United States of America

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Past date: Past date must be from 1st Jan, 2009 onwards.

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Daily and hourly data from 1 Jan 2009 onwards.
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Fri 25 Sep, 2026 Weather in Grayslake

Sunrise: 06:42 AM Sunset: 06:44 PM	Moonrise: 06:12 PM Moonset: 05:41 AM	Max: 18.2 °c	Min: 14.2 °c	Avg: 15.8 °c	Precip: 0.00 mm	Max Wind: 10.8 kph

	Fri 25 0:00 am	Fri 25 3:00 am	Fri 25 6:00 am	Fri 25 9:00 am	Fri 25 12:00 pm	Fri 25 3:00 pm	Fri 25 6:00 pm	Fri 25 9:00 pm
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Temp	16.5°c	16.1°c	15.2°c	15.3°c	15.9°c	18.2°c	15.5°c	14.3°c
Wind	7.2 kmph	7.9 kmph	5.4 kmph	7.6 kmph	6.1 kmph	8.6 kmph	9.0 kmph	5.8 kmph
Precip	0.00 mm	0.00 mm	0.00 mm	0.00 mm	0.00 mm	0.00 mm	0.00 mm	0.00 mm
Cloud	100%	100%	100%	100%	100%	44%	74%	93%
Humidity	84%	86%	83%	74%	59%	47%	60%	70%
Pressure	1025 mb	1024 mb	1026 mb	1027 mb	1026 mb	1025 mb	1024 mb	1024 mb

Grayslake Annual Weather Averages

Month	High Temp	Low Temp	Avg Temp	Sunshine Hours	Rainfall	Rain days	Pressure
January	-2°C / 28°F	-8°C / 17°F	-5°C / 23°F	112 hours	58.30 mm / 2.30 In	8 days	1019 mb / 31 In
February	0°C / 32°F	-7°C / 20°F	-3°C / 26°F	116 hours	63.14 mm / 2.49 In	7 days	1019 mb / 31 In
March	7°C / 44°F	-1°C / 31°F	3°C / 37°F	135 hours	93.56 mm / 3.68 In	7 days	1018 mb / 31 In
April	12°C / 54°F	4°C / 39°F	8°C / 46°F	131 hours	145.75 mm / 5.74 In	9 days	1014 mb / 30 In
May	18°C / 65°F	10°C / 50°F	14°C / 57°F	165 hours	130.36 mm / 5.13 In	9 days	1015 mb / 30 In
June	24°C / 75°F	16°C / 60°F	20°C / 68°F	199 hours	138.71 mm / 5.46 In	8 days	1013 mb / 30 In
July	27°C / 80°F	19°C / 65°F	23°C / 73°F	214 hours	102.25 mm / 4.03 In	7 days	1015 mb / 30 In
August	26°C / 79°F	18°C / 64°F	22°C / 71°F	220 hours	120.29 mm / 4.74 In	7 days	1015 mb / 30 In
September	23°C / 73°F	15°C / 58°F	18°C / 65°F	224 hours	79.34 mm / 3.12 In	6 days	1017 mb / 31 In
October	16°C / 60°F	8°C / 47°F	12°C / 53°F	165 hours	103.60 mm / 4.08 In	7 days	1016 mb / 30 In
November	8°C / 46°F	1°C / 34°F	5°C / 40°F	168 hours	73.28 mm / 2.89 In	5 days	1019 mb / 31 In
December	2°C / 35°F	-4°C / 25°F	-1°C / 30°F	118 hours	68.12 mm / 2.68 In	7 days	1018 mb / 31 In

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