Flat Rock · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
Flat Rock & 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
29°
Tue, Aug 18
Coldest night
10°
Thu, Aug 27
Days with precip
3 / 14
of 14 forecast days
Nicest day
Sun, Aug 30
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 22 – Sun 23 Aug
26° 14°
67% precip chance
Sat 29 – Sun 30 Aug
21° 12°
4% precip chance
Sat 5 – Sun 6 Sep
17° 10°
typical range
Sat 12 – Sun 13 Sep
17° 10°
typical range
30 days — Flat Rock
14 forecast + 16 climatology
Tue · Today Sunny
29°16°6%⌄
Wind18 mph SW
Gusts26 mph
UV index8 – High
Precip chance6%
Sunrise06:44
Sunset20:29
Wed · Tomorrow Showers
26°19°11.2 mm⌄
Wind15 mph NE
Gusts24 mph
UV index7 – High
Precip chance86%
Sunrise06:45
Sunset20:28
Thursday 20/8 Sunny
25°18°0.4 mm⌄
Wind13 mph E
Gusts23 mph
UV index6 – High
Precip chance36%
Sunrise06:46
Sunset20:26
Friday 21/8 Mostly cloudy
24°18°9%⌄
Wind8 mph S
Gusts19 mph
UV index7 – High
Precip chance9%
Sunrise06:47
Sunset20:25
Saturday 22/8 Mostly cloudy
26°19°2.9 mm⌄
Wind14 mph N
Gusts27 mph
UV index6 – High
Precip chance67%
Sunrise06:48
Sunset20:23
Sunday 23/8 Sunny
24°14°7%⌄
Wind16 mph NW
Gusts26 mph
UV index6 – High
Precip chance7%
Sunrise06:49
Sunset20:22
Monday 24/8 Sunny
22°17°17%⌄
Wind10 mph S
Gusts19 mph
UV index6 – High
Precip chance17%
Sunrise06:50
Sunset20:20
Tuesday 25/8 Showers
27°18°4.9 mm⌄
Wind17 mph SW
Gusts27 mph
UV index7 – High
Precip chance69%
Sunrise06:51
Sunset20:19
Wednesday 26/8 Showers
19°14°0.7 mm⌄
Wind17 mph NW
Gusts27 mph
UV index4 – Moderate
Precip chance53%
Sunrise06:52
Sunset20:17
Thursday 27/8 Sunny
20°10°4%⌄
Wind16 mph NW
Gusts24 mph
UV index6 – High
Precip chance4%
Sunrise06:53
Sunset20:15
Friday 28/8 Sunny
21°12°5%⌄
Wind12 mph E
Gusts19 mph
UV index6 – High
Precip chance5%
Sunrise06:54
Sunset20:14
Saturday 29/8 Sunny
20°12°3%⌄
Wind11 mph NE
Gusts19 mph
UV index5 – Moderate
Precip chance3%
Sunrise06:55
Sunset20:12
Sunday 30/8 Sunny
21°13°4%⌄
Wind11 mph NE
Gusts15 mph
UV index6 – High
Precip chance4%
Sunrise06:56
Sunset20:10
Monday 31/8 Sunny
23°15°17%⌄
Wind8 mph NE
Gusts13 mph
UV index6 – High
Precip chance17%
Sunrise06:57
Sunset20:09
Tuesday 1/9 Rain (climatological)
19°12°2.9 mm⌄
Day≈16–22°
Night≈9–15°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 2/9 Partly cloudy (climatological)
23°14°20%⌄
Day≈20–26°
Night≈11–17°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 3/9 Partly cloudy (climatological)
23°14°20%⌄
Day≈20–26°
Night≈11–17°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 4/9 Rain (climatological)
21°13°4.0 mm⌄
Day≈18–24°
Night≈10–16°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 5/9 Partly cloudy (climatological)
16°10°20%⌄
Day≈13–19°
Night≈7–13°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 6/9 Partly cloudy (climatological)
17°10°20%⌄
Day≈14–20°
Night≈7–13°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 7/9 Rain (climatological)
16°10°4.7 mm⌄
Day≈13–19°
Night≈7–13°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 8/9 Partly cloudy (climatological)
18°11°20%⌄
Day≈15–21°
Night≈8–14°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 9/9 Partly cloudy (climatological)
20°12°20%⌄
Day≈17–23°
Night≈9–15°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 10/9 Rain (climatological)
21°12°4.1 mm⌄
Day≈18–24°
Night≈9–15°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 11/9 Partly cloudy (climatological)
20°12°20%⌄
Day≈17–23°
Night≈9–15°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 12/9 Partly cloudy (climatological)
17°10°20%⌄
Day≈14–20°
Night≈7–13°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 13/9 Rain (climatological)
16°10°5.9 mm⌄
Day≈13–19°
Night≈7–13°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 14/9 Partly cloudy (climatological)
17°10°20%⌄
Day≈14–20°
Night≈7–13°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 15/9 Partly cloudy (climatological)
19°11°20%⌄
Day≈16–22°
Night≈8–14°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 16/9 Rain (climatological)
21°12°4.7 mm⌄
Day≈18–24°
Night≈9–15°
Precip≈1.7 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 Flat Rock, 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.