Deer Run · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
Deer Run & 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
89°
Sat, Aug 22
Coldest night
52°
Tue, Aug 18
Days with precip
5 / 14
of 14 forecast days
Nicest day
Mon, Aug 24
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 22 – Sun 23 Aug
89° 56°
57% precip chance
Sat 29 – Sun 30 Aug
85° 53°
57% precip chance
Sat 5 – Sun 6 Sep
67° 44°
typical range
Sat 12 – Sun 13 Sep
66° 43°
typical range
30 days — Deer Run
14 forecast + 16 climatology
Tue · Today Sunny
78°52°1.4 mm⌄
Wind13 mph N
Gusts21 mph
UV index5 – Moderate
Precip chance57%
Sunrise06:28
Sunset20:51
Wed · Tomorrow Sunny
80°55°0.2 mm⌄
Wind7 mph N
Gusts18 mph
UV index6 – High
Precip chance17%
Sunrise06:29
Sunset20:49
Thursday 20/8 Showers
82°56°3.6 mm⌄
Wind22 mph NE
Gusts32 mph
UV index6 – Moderate
Precip chance65%
Sunrise06:31
Sunset20:47
Friday 21/8 Sunny
81°55°8%⌄
Wind12 mph SE
Gusts16 mph
UV index7 – High
Precip chance8%
Sunrise06:33
Sunset20:45
Saturday 22/8 Mostly cloudy
89°59°17%⌄
Wind23 mph SW
Gusts31 mph
UV index8 – Very high
Precip chance17%
Sunrise06:34
Sunset20:43
Sunday 23/8 Sunny
77°56°1.1 mm⌄
Wind13 mph NW
Gusts32 mph
UV index7 – High
Precip chance57%
Sunrise06:36
Sunset20:41
Monday 24/8 Sunny
79°55°3%⌄
Wind9 mph E
Gusts17 mph
UV index6 – High
Precip chance3%
Sunrise06:37
Sunset20:39
Tuesday 25/8 Sunny
81°55°2%⌄
Wind13 mph SE
Gusts27 mph
UV index7 – High
Precip chance2%
Sunrise06:39
Sunset20:37
Wednesday 26/8 Mostly cloudy
83°54°6%⌄
Wind17 mph SE
Gusts32 mph
UV index6 – High
Precip chance6%
Sunrise06:40
Sunset20:35
Thursday 27/8 Mostly cloudy
84°59°5%⌄
Wind16 mph S
Gusts31 mph
UV index7 – High
Precip chance5%
Sunrise06:42
Sunset20:33
Friday 28/8 Sunny
86°62°1%⌄
Wind16 mph SW
Gusts25 mph
UV index7 – High
Precip chance1%
Sunrise06:43
Sunset20:31
Saturday 29/8 Sunny
83°53°4%⌄
Wind13 mph SE
Gusts23 mph
UV index7 – High
Precip chance4%
Sunrise06:45
Sunset20:28
Sunday 30/8 Sunny
85°58°2.6 mm⌄
Wind13 mph S
Gusts21 mph
UV index7 – High
Precip chance57%
Sunrise06:47
Sunset20:26
Monday 31/8 Showers
63°55°10.7 mm⌄
Wind12 mph NW
Gusts17 mph
UV index5 – Moderate
Precip chance86%
Sunrise06:48
Sunset20:24
Tuesday 1/9 Rain (climatological)
69°46°5.0 mm⌄
Day≈64–74°
Night≈40–51°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 2/9 Partly cloudy (climatological)
74°49°20%⌄
Day≈69–80°
Night≈43–54°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 3/9 Partly cloudy (climatological)
73°48°20%⌄
Day≈67–78°
Night≈42–53°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 4/9 Rain (climatological)
72°47°4.4 mm⌄
Day≈67–78°
Night≈42–53°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 5/9 Partly cloudy (climatological)
67°45°20%⌄
Day≈62–73°
Night≈39–50°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 6/9 Partly cloudy (climatological)
67°44°20%⌄
Day≈62–72°
Night≈39–50°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 7/9 Rain (climatological)
64°43°4.2 mm⌄
Day≈59–70°
Night≈37–48°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 8/9 Partly cloudy (climatological)
72°47°20%⌄
Day≈66–77°
Night≈42–53°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 9/9 Partly cloudy (climatological)
71°47°20%⌄
Day≈66–77°
Night≈41–52°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 10/9 Rain (climatological)
72°47°4.7 mm⌄
Day≈66–77°
Night≈42–53°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 11/9 Partly cloudy (climatological)
70°46°20%⌄
Day≈65–76°
Night≈41–52°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 12/9 Partly cloudy (climatological)
66°44°20%⌄
Day≈61–72°
Night≈38–49°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 13/9 Rain (climatological)
65°43°5.4 mm⌄
Day≈60–71°
Night≈38–49°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 14/9 Partly cloudy (climatological)
64°42°20%⌄
Day≈58–69°
Night≈37–48°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 15/9 Partly cloudy (climatological)
71°46°20%⌄
Day≈65–76°
Night≈41–52°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 16/9 Rain (climatological)
72°47°2.7 mm⌄
Day≈66–77°
Night≈42–52°
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 Deer Run, 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.