Grayslake · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
Grayslake & neighbors — hit play
Every city on the map carries real forecast data from the same models as its city page, refreshed several times a day. The icon is the day's overall look; the number is the afternoon high.
Next 14 days at a glance
from the model forecast
Hottest day
84°
Fri, Sep 4
Coldest night
55°
Mon, Sep 7
Days with precip
7 / 14
of 14 forecast days
Nicest day
Fri, Aug 28
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 29 – Sun 30 Aug
82° 64°
53% precip chance
Sat 5 – Sun 6 Sep
76° 60°
82% precip chance
Sat 12 – Sun 13 Sep
70° 57°
typical range
Sat 19 – Sun 20 Sep
72° 55°
typical range
30 days — Grayslake
14 forecast + 16 climatology
Wed · Today Showers
80°66°0.6 mm⌄
Wind12 mph SW
Gusts26 mph
UV index7 – High
Precip chance44%
Sunrise06:11
Sunset19:36
Thu · Tomorrow Sunny
78°64°17%⌄
Wind8 mph N
Gusts13 mph
UV index7 – High
Precip chance17%
Sunrise06:12
Sunset19:35
Friday 28/8 Sunny
72°63°6%⌄
Wind9 mph E
Gusts20 mph
UV index6 – High
Precip chance6%
Sunrise06:13
Sunset19:33
Saturday 29/8 Mostly cloudy
78°64°14%⌄
Wind11 mph S
Gusts27 mph
UV index6 – High
Precip chance14%
Sunrise06:14
Sunset19:31
Sunday 30/8 Showers
82°69°0.9 mm⌄
Wind17 mph SW
Gusts40 mph
UV index6 – High
Precip chance53%
Sunrise06:15
Sunset19:30
Monday 31/8 Showers
74°66°19.0 mm⌄
Wind9 mph N
Gusts24 mph
UV index5 – Moderate
Precip chance93%
Sunrise06:16
Sunset19:28
Tuesday 1/9 Showers
77°66°0.9 mm⌄
Wind7 mph E
Gusts16 mph
UV index6 – High
Precip chance64%
Sunrise06:17
Sunset19:26
Wednesday 2/9 Sunny
82°67°2.8 mm⌄
Wind7 mph NE
Gusts16 mph
UV index7 – High
Precip chance70%
Sunrise06:18
Sunset19:25
Thursday 3/9 Mostly cloudy
83°70°3.5 mm⌄
Wind9 mph SW
Gusts25 mph
UV index7 – High
Precip chance68%
Sunrise06:19
Sunset19:23
Friday 4/9 Sunny
84°69°25.6 mm⌄
Wind10 mph SW
Gusts21 mph
UV index7 – High
Precip chance81%
Sunrise06:20
Sunset19:21
Saturday 5/9 Mostly cloudy
76°66°5.5 mm⌄
Wind9 mph W
Gusts22 mph
UV index5 – Moderate
Precip chance82%
Sunrise06:21
Sunset19:20
Sunday 6/9 Mostly cloudy
67°60°13%⌄
Wind11 mph W
Gusts16 mph
UV index5 – Moderate
Precip chance13%
Sunrise06:22
Sunset19:18
Monday 7/9 Mostly cloudy
66°55°9%⌄
Wind9 mph NE
Gusts15 mph
UV index5 – Moderate
Precip chance9%
Sunrise06:23
Sunset19:16
Tuesday 8/9 Mostly cloudy
66°56°7.2 mm⌄
Wind11 mph E
Gusts22 mph
UV index4 – Moderate
Precip chance83%
Sunrise06:24
Sunset19:14
Wednesday 9/9 Rain (climatological)
69°58°8.6 mm⌄
Day≈64–74°
Night≈52–63°
Precip≈5.6 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 10/9 Partly cloudy (climatological)
74°61°20%⌄
Day≈69–80°
Night≈55–66°
Precip≈5.6 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 11/9 Partly cloudy (climatological)
73°60°20%⌄
Day≈67–78°
Night≈55–65°
Precip≈5.6 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 12/9 Rain (climatological)
70°58°11.4 mm⌄
Day≈65–76°
Night≈53–64°
Precip≈5.6 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 13/9 Partly cloudy (climatological)
68°57°20%⌄
Day≈63–74°
Night≈52–63°
Precip≈5.6 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 14/9 Partly cloudy (climatological)
66°56°20%⌄
Day≈60–71°
Night≈50–61°
Precip≈5.6 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 15/9 Rain (climatological)
66°56°11.0 mm⌄
Day≈61–72°
Night≈51–62°
Precip≈5.6 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 16/9 Partly cloudy (climatological)
68°57°20%⌄
Day≈62–73°
Night≈51–62°
Precip≈5.6 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 17/9 Partly cloudy (climatological)
72°59°20%⌄
Day≈66–77°
Night≈54–65°
Precip≈5.6 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Rain (climatological)
74°61°12.4 mm⌄
Day≈69–80°
Night≈56–66°
Precip≈5.6 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Partly cloudy (climatological)
72°59°20%⌄
Day≈66–77°
Night≈54–65°
Precip≈5.6 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Partly cloudy (climatological)
65°55°20%⌄
Day≈60–71°
Night≈50–61°
Precip≈5.6 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Rain (climatological)
61°53°8.1 mm⌄
Day≈56–66°
Night≈47–58°
Precip≈5.6 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 22/9 Partly cloudy (climatological)
64°55°20%⌄
Day≈59–69°
Night≈49–60°
Precip≈5.6 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 23/9 Partly cloudy (climatological)
69°57°20%⌄
Day≈63–74°
Night≈52–63°
Precip≈5.6 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 24/9 Rain (climatological)
72°60°16.2 mm⌄
Day≈67–78°
Night≈54–65°
Precip≈5.6 in / September
(climatological)Typical range for these dates · 1991–2020
How does a 30-day outlook work?
The first 14 days are a live model forecast. The back half of the month shows the typical range for those dates — useful for planning, not a literal prediction.
First 14 days: a real forecast, blended from NBM, ECMWF and GFS runs. Trust it most inside three days; by the second week treat it as a lean, not a promise.
Rest of the month: past day 14 we stop pretending to forecast and switch to the climate corridor — the range those dates have produced over three decades computed directly for Grayslake, with mild week-to-week wiggle.
Good question for this page: "Is late August usually humid in Chicago?" Bad question: "Do I need an umbrella on the 29th?" — three weeks out no one knows, and that's the honest answer.