Union · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
Union & 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°
Mon, Aug 31
Coldest night
57°
Mon, Aug 24
Days with precip
6 / 14
of 14 forecast days
Nicest day
Tue, Aug 25
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 29 – Sun 30 Aug
82° 65°
51% precip chance
Sat 5 – Sun 6 Sep
87° 71°
80% precip chance
Sat 12 – Sun 13 Sep
71° 57°
typical range
Sat 19 – Sun 20 Sep
72° 57°
typical range
30 days — Union
14 forecast + 16 climatology
Mon · Today Sunny
83°57°5%⌄
Wind8 mph NW
Gusts15 mph
UV index8 – High
Precip chance5%
Sunrise07:00
Sunset20:21
Tue · Tomorrow Sunny
79°60°6%⌄
Wind6 mph N
Gusts15 mph
UV index8 – Very high
Precip chance6%
Sunrise07:01
Sunset20:20
Wednesday 26/8 Sunny
85°61°4%⌄
Wind4 mph S
Gusts15 mph
UV index6 – High
Precip chance4%
Sunrise07:02
Sunset20:18
Thursday 27/8 Showers
80°67°6.7 mm⌄
Wind8 mph SW
Gusts15 mph
UV index8 – High
Precip chance78%
Sunrise07:03
Sunset20:17
Friday 28/8 Sunny
81°64°17%⌄
Wind7 mph NW
Gusts18 mph
UV index7 – High
Precip chance17%
Sunrise07:04
Sunset20:15
Saturday 29/8 Sunny
82°65°7%⌄
Wind6 mph N
Gusts17 mph
UV index7 – High
Precip chance7%
Sunrise07:05
Sunset20:14
Sunday 30/8 Mostly cloudy
77°69°0.6 mm⌄
Wind5 mph SW
Gusts13 mph
UV index5 – Moderate
Precip chance51%
Sunrise07:05
Sunset20:12
Monday 31/8 Showers
89°68°9.8 mm⌄
Wind11 mph N
Gusts18 mph
UV index7 – High
Precip chance86%
Sunrise07:06
Sunset20:11
Tuesday 1/9 Fog
88°68°2.4 mm⌄
Wind5 mph E
Gusts12 mph
UV index7 – High
Precip chance68%
Sunrise07:07
Sunset20:09
Wednesday 2/9 Mostly cloudy
88°71°3.3 mm⌄
Wind13 mph SW
Gusts28 mph
UV index7 – High
Precip chance74%
Sunrise07:08
Sunset20:08
Thursday 3/9 Sunny
85°68°0.7 mm⌄
Wind6 mph NE
Gusts14 mph
UV index7 – High
Precip chance46%
Sunrise07:09
Sunset20:06
Friday 4/9 Sunny
85°70°10%⌄
Wind7 mph S
Gusts11 mph
UV index7 – High
Precip chance10%
Sunrise07:10
Sunset20:05
Saturday 5/9 Mostly cloudy
87°73°2.6 mm⌄
Wind8 mph SW
Gusts16 mph
UV index7 – High
Precip chance67%
Sunrise07:11
Sunset20:03
Sunday 6/9 Mostly cloudy
83°71°6.8 mm⌄
Wind8 mph SW
Gusts19 mph
UV index7 – High
Precip chance80%
Sunrise07:12
Sunset20:01
Monday 7/9 Rain (climatological)
78°61°5.5 mm⌄
Day≈73–83°
Night≈56–67°
Precip≈2.8 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 8/9 Partly cloudy (climatological)
80°62°20%⌄
Day≈74–85°
Night≈57–68°
Precip≈2.8 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 9/9 Partly cloudy (climatological)
83°65°20%⌄
Day≈78–89°
Night≈59–70°
Precip≈2.8 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 10/9 Rain (climatological)
79°62°8.6 mm⌄
Day≈74–84°
Night≈56–67°
Precip≈2.8 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 11/9 Partly cloudy (climatological)
77°60°20%⌄
Day≈71–82°
Night≈55–66°
Precip≈2.8 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 12/9 Partly cloudy (climatological)
71°57°20%⌄
Day≈65–76°
Night≈51–62°
Precip≈2.8 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 13/9 Rain (climatological)
71°57°8.2 mm⌄
Day≈65–76°
Night≈52–62°
Precip≈2.8 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 14/9 Partly cloudy (climatological)
77°61°20%⌄
Day≈72–82°
Night≈55–66°
Precip≈2.8 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 15/9 Partly cloudy (climatological)
78°61°20%⌄
Day≈73–83°
Night≈56–67°
Precip≈2.8 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 16/9 Rain (climatological)
79°62°9.4 mm⌄
Day≈73–84°
Night≈56–67°
Precip≈2.8 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 17/9 Partly cloudy (climatological)
77°61°20%⌄
Day≈72–83°
Night≈56–66°
Precip≈2.8 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Partly cloudy (climatological)
74°59°20%⌄
Day≈69–79°
Night≈53–64°
Precip≈2.8 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Rain (climatological)
71°57°6.2 mm⌄
Day≈65–76°
Night≈51–62°
Precip≈2.8 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Partly cloudy (climatological)
72°58°20%⌄
Day≈67–78°
Night≈53–63°
Precip≈2.8 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Partly cloudy (climatological)
78°61°20%⌄
Day≈73–83°
Night≈56–67°
Precip≈2.8 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 22/9 Rain (climatological)
79°62°4.3 mm⌄
Day≈73–84°
Night≈56–67°
Precip≈2.8 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 Union, 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.