Annual mean 10°C · wettest around April · prevailing wind SW
Warmest
26.5 °C
Coldest
-2.9 °C
Wettest
18%
Windiest
5.9 m/s
Prevailing
SW
5.0 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Grayslake over the whole year is 10°C. July is the hottest month, with highs of about 26°C; January is the coldest, with lows of about -5°C. Grayslake has no sharply defined rainy season: the chance of rain on a given day runs from 11% in February, the driest month, to 15% in April, the wettest. Winds in Grayslake are highest in February, averaging 4.5 m/s (16 km/h), and lightest in August, at 3.2 m/s (12 km/h). The prevailing wind is from the SW. The clearest skies in Grayslake come in July, when the sky is typically 37% covered; January is the cloudiest month, at 65%.
Month by month Grayslake climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
-2°C
-5°C
-8°C
12%
65%
4.4 m/s
0
0
1
February
0°C
-4°C
-6°C
11%
53%
4.5 m/s
1
0
7
March
6°C
1°C
0°C
13%
55%
4.5 m/s
2
0
18
April
11°C
6°C
6°C
15%
55%
4.5 m/s
15
0
42
May
17°C
12°C
15°C
14%
50%
4.0 m/s
47
11
65
June
24°C
18°C
23°C
12%
39%
3.7 m/s
65
38
47
July
26°C
21°C
27°C
11%
37%
3.3 m/s
57
59
24
August
26°C
19°C
26°C
11%
39%
3.2 m/s
64
55
29
September
23°C
16°C
22°C
12%
43%
3.5 m/s
70
30
57
October
15°C
10°C
12°C
14%
50%
3.9 m/s
36
4
64
November
7°C
3°C
2°C
11%
53%
4.3 m/s
7
0
27
December
2°C
-2°C
-4°C
12%
60%
4.3 m/s
0
0
6
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Grayslake weather by season
Year round, Grayslake has days of about -2°C at their warmest in January, its coolest month, and 26°C in July, its warmest; the coolest hours of the day run from -5°C to 21°C through the year, and the average temperature over the year is 10°C around the clock. Rain is most likely around April and least likely around February. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Grayslake weather in winterDecember to February
High -0°CLow -3°CRain 12%
Winter in Grayslake has typical daily highs of about -0°C and lows of about -3°C, with a 12% chance of rain on a given day.
Grayslake weather in springMarch to May
High 11°CLow 6°CRain 14%
Spring in Grayslake has typical daily highs of about 11°C and lows of about 6°C, with a 14% chance of rain on a given day.
Grayslake weather in summerJune to August
High 25°CLow 19°CRain 11%
Summer in Grayslake has typical daily highs of about 25°C and lows of about 19°C, with a 11% chance of rain on a given day.
Grayslake weather in autumnSeptember to November
High 15°CLow 9°CRain 12%
Autumn in Grayslake has typical daily highs of about 15°C and lows of about 9°C, with a 12% chance of rain on a given day.
When is the rainy season in Grayslake?
Grayslake has no sharply defined rainy season: the chance of rain on a given day runs from 11% in February, the driest month, to 15% in April, the wettest.
What time of year is Grayslake windiest?
Winds in Grayslake are highest in February, averaging 4.5 m/s (16 km/h), and lightest in August, at 3.2 m/s (12 km/h). The prevailing wind is from the SW.
What is the average temperature in Grayslake year round?
The average temperature in Grayslake over the whole year is 10°C. July is the hottest month, with highs of about 26°C; January is the coldest, with lows of about -5°C.