Alliance · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
Alliance & 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
78°
Sun, Sep 6
Coldest night
54°
Mon, Aug 24
Days with precip
7 / 14
of 14 forecast days
Nicest day
Sat, Aug 29
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 29 – Sun 30 Aug
73° 59°
89% precip chance
Sat 5 – Sun 6 Sep
78° 67°
90% precip chance
Sat 12 – Sun 13 Sep
64° 53°
typical range
Sat 19 – Sun 20 Sep
64° 51°
typical range
30 days — Alliance
14 forecast + 16 climatology
Mon · Today Showers
76°54°6.3 mm⌄
Wind13 mph W
Gusts24 mph
UV index7 – High
Precip chance73%
Sunrise06:43
Sunset20:10
Tue · Tomorrow Showers
70°57°0.5 mm⌄
Wind9 mph NW
Gusts23 mph
UV index7 – High
Precip chance41%
Sunrise06:44
Sunset20:08
Wednesday 26/8 Mostly cloudy
75°59°15%⌄
Wind7 mph S
Gusts9 mph
UV index7 – High
Precip chance15%
Sunrise06:45
Sunset20:07
Thursday 27/8 Mostly cloudy
77°62°0.6 mm⌄
Wind11 mph SW
Gusts22 mph
UV index7 – High
Precip chance45%
Sunrise06:46
Sunset20:05
Friday 28/8 Sunny
75°61°0.2 mm⌄
Wind10 mph NW
Gusts17 mph
UV index6 – High
Precip chance18%
Sunrise06:47
Sunset20:03
Saturday 29/8 Sunny
73°59°10%⌄
Wind6 mph NE
Gusts14 mph
UV index6 – High
Precip chance10%
Sunrise06:48
Sunset20:02
Sunday 30/8 Showers
67°60°5.4 mm⌄
Wind7 mph SE
Gusts18 mph
UV index4 – Moderate
Precip chance89%
Sunrise06:49
Sunset20:00
Monday 31/8 Showers
73°64°8.2 mm⌄
Wind10 mph SW
Gusts19 mph
UV index5 – Moderate
Precip chance90%
Sunrise06:50
Sunset19:59
Tuesday 1/9 Fog
76°62°5.4 mm⌄
Wind5 mph W
Gusts11 mph
UV index6 – High
Precip chance79%
Sunrise06:51
Sunset19:57
Wednesday 2/9 Showers
69°64°19.3 mm⌄
Wind8 mph S
Gusts20 mph
UV index5 – Moderate
Precip chance93%
Sunrise06:52
Sunset19:55
Thursday 3/9 Fog
76°65°0.4 mm⌄
Wind10 mph NW
Gusts13 mph
UV index6 – High
Precip chance43%
Sunrise06:53
Sunset19:54
Friday 4/9 Mostly cloudy
77°65°16%⌄
Wind8 mph N
Gusts15 mph
UV index6 – High
Precip chance16%
Sunrise06:54
Sunset19:52
Saturday 5/9 Mostly cloudy
77°67°2.3 mm⌄
Wind11 mph SW
Gusts22 mph
UV index5 – Moderate
Precip chance78%
Sunrise06:55
Sunset19:50
Sunday 6/9 Showers
78°69°14.6 mm⌄
Wind10 mph SW
Gusts23 mph
UV index7 – High
Precip chance90%
Sunrise06:56
Sunset19:49
Monday 7/9 Rain (climatological)
67°55°17.4 mm⌄
Day≈61–72°
Night≈50–61°
Precip≈5.4 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 8/9 Partly cloudy (climatological)
70°57°20%⌄
Day≈64–75°
Night≈52–62°
Precip≈5.4 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 9/9 Partly cloudy (climatological)
73°59°20%⌄
Day≈68–78°
Night≈54–65°
Precip≈5.4 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 10/9 Rain (climatological)
71°58°17.4 mm⌄
Day≈65–76°
Night≈53–63°
Precip≈5.4 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 11/9 Partly cloudy (climatological)
67°55°20%⌄
Day≈61–72°
Night≈50–61°
Precip≈5.4 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 12/9 Partly cloudy (climatological)
64°54°20%⌄
Day≈58–69°
Night≈48–59°
Precip≈5.4 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 13/9 Rain (climatological)
62°53°16.0 mm⌄
Day≈57–67°
Night≈47–58°
Precip≈5.4 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 14/9 Partly cloudy (climatological)
69°57°20%⌄
Day≈63–74°
Night≈51–62°
Precip≈5.4 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 15/9 Partly cloudy (climatological)
68°56°20%⌄
Day≈63–73°
Night≈51–62°
Precip≈5.4 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 16/9 Rain (climatological)
72°58°14.2 mm⌄
Day≈66–77°
Night≈53–64°
Precip≈5.4 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 17/9 Partly cloudy (climatological)
66°55°20%⌄
Day≈61–72°
Night≈50–61°
Precip≈5.4 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Partly cloudy (climatological)
63°53°20%⌄
Day≈57–68°
Night≈48–58°
Precip≈5.4 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Rain (climatological)
60°51°7.8 mm⌄
Day≈54–65°
Night≈46–56°
Precip≈5.4 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Partly cloudy (climatological)
64°54°20%⌄
Day≈59–69°
Night≈48–59°
Precip≈5.4 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Partly cloudy (climatological)
66°55°20%⌄
Day≈61–71°
Night≈50–60°
Precip≈5.4 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 22/9 Rain (climatological)
72°59°16.9 mm⌄
Day≈67–78°
Night≈53–64°
Precip≈5.4 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 Alliance, 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.