Barnum Island · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
Barnum Island & 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
88°
Fri, Aug 28
Coldest night
66°
Tue, Sep 8
Days with precip
5 / 14
of 14 forecast days
Nicest day
Wed, Sep 9
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 29 – Sun 30 Aug
85° 67°
6% precip chance
Sat 5 – Sun 6 Sep
79° 69°
89% precip chance
Sat 12 – Sun 13 Sep
78° 65°
typical range
Sat 19 – Sun 20 Sep
77° 63°
typical range
30 days — Barnum Island
14 forecast + 16 climatology
Thu · Today Mostly cloudy
81°68°24%⌄
Wind14 mph S
Gusts22 mph
UV index7 – High
Precip chance24%
Sunrise06:17
Sunset19:35
Fri · Tomorrow Mostly cloudy
88°71°0.9 mm⌄
Wind11 mph N
Gusts16 mph
UV index7 – High
Precip chance51%
Sunrise06:18
Sunset19:33
Saturday 29/8 Mostly cloudy
81°67°6%⌄
Wind12 mph N
Gusts19 mph
UV index7 – High
Precip chance6%
Sunrise06:19
Sunset19:32
Sunday 30/8 Sunny
85°70°6%⌄
Wind12 mph S
Gusts21 mph
UV index7 – High
Precip chance6%
Sunrise06:19
Sunset19:30
Monday 31/8 Mostly cloudy
86°73°0.8 mm⌄
Wind10 mph SW
Gusts22 mph
UV index6 – High
Precip chance48%
Sunrise06:20
Sunset19:28
Tuesday 1/9 Showers
87°71°6.3 mm⌄
Wind13 mph NE
Gusts25 mph
UV index7 – High
Precip chance80%
Sunrise06:21
Sunset19:27
Wednesday 2/9 Showers
75°68°2.8 mm⌄
Wind11 mph E
Gusts15 mph
UV index5 – Moderate
Precip chance70%
Sunrise06:22
Sunset19:25
Thursday 3/9 Showers
87°71°8.3 mm⌄
Wind12 mph SW
Gusts21 mph
UV index7 – High
Precip chance84%
Sunrise06:23
Sunset19:24
Friday 4/9 Sunny
87°73°4.4 mm⌄
Wind12 mph S
Gusts20 mph
UV index8 – Very high
Precip chance62%
Sunrise06:24
Sunset19:22
Saturday 5/9 Showers
79°70°14.8 mm⌄
Wind12 mph NE
Gusts24 mph
UV index6 – High
Precip chance89%
Sunrise06:25
Sunset19:20
Sunday 6/9 Mostly cloudy
74°69°16%⌄
Wind7 mph E
Gusts12 mph
UV index6 – High
Precip chance16%
Sunrise06:26
Sunset19:19
Monday 7/9 Sunny
80°68°2%⌄
Wind10 mph N
Gusts19 mph
UV index7 – High
Precip chance2%
Sunrise06:27
Sunset19:17
Tuesday 8/9 Sunny
78°66°3%⌄
Wind11 mph NE
Gusts17 mph
UV index7 – High
Precip chance3%
Sunrise06:28
Sunset19:15
Wednesday 9/9 Mostly cloudy
76°67°9%⌄
Wind6 mph E
Gusts15 mph
UV index6 – High
Precip chance9%
Sunrise06:29
Sunset19:14
Thursday 10/9 Rain (climatological)
73°62°10.8 mm⌄
Day≈67–78°
Night≈56–67°
Precip≈3.3 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 11/9 Partly cloudy (climatological)
76°64°20%⌄
Day≈71–82°
Night≈59–69°
Precip≈3.3 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 12/9 Partly cloudy (climatological)
78°65°20%⌄
Day≈73–83°
Night≈60–70°
Precip≈3.3 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 13/9 Rain (climatological)
78°65°10.2 mm⌄
Day≈72–83°
Night≈59–70°
Precip≈3.3 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 14/9 Partly cloudy (climatological)
72°61°20%⌄
Day≈66–77°
Night≈56–67°
Precip≈3.3 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 15/9 Partly cloudy (climatological)
71°60°20%⌄
Day≈65–76°
Night≈55–66°
Precip≈3.3 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 16/9 Rain (climatological)
71°61°7.5 mm⌄
Day≈65–76°
Night≈55–66°
Precip≈3.3 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 17/9 Partly cloudy (climatological)
72°62°20%⌄
Day≈67–78°
Night≈56–67°
Precip≈3.3 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Partly cloudy (climatological)
79°66°20%⌄
Day≈74–85°
Night≈60–71°
Precip≈3.3 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Rain (climatological)
77°64°11.1 mm⌄
Day≈71–82°
Night≈59–70°
Precip≈3.3 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Partly cloudy (climatological)
74°63°20%⌄
Day≈69–80°
Night≈58–68°
Precip≈3.3 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Partly cloudy (climatological)
72°61°20%⌄
Day≈67–77°
Night≈56–67°
Precip≈3.3 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 22/9 Rain (climatological)
70°60°7.5 mm⌄
Day≈64–75°
Night≈55–65°
Precip≈3.3 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 23/9 Partly cloudy (climatological)
69°60°20%⌄
Day≈64–75°
Night≈54–65°
Precip≈3.3 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 24/9 Partly cloudy (climatological)
75°63°20%⌄
Day≈69–80°
Night≈58–69°
Precip≈3.3 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 25/9 Rain (climatological)
77°64°9.4 mm⌄
Day≈72–83°
Night≈59–70°
Precip≈3.3 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 Barnum Island, 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.