Castle Shannon · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
Castle Shannon & 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
92°
Thu, Sep 3
Coldest night
53°
Sat, Sep 12
Days with precip
3 / 14
of 14 forecast days
Nicest day
Fri, Sep 11
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 5 – Sun 6 Sep
86° 64°
91% precip chance
Sat 12 – Sun 13 Sep
73° 53°
typical range
Sat 19 – Sun 20 Sep
72° 57°
typical range
Sat 26 – Sun 27 Sep
70° 55°
typical range
30 days — Castle Shannon
14 forecast + 16 climatology
Sun · Today Mostly cloudy
85°67°9%⌄
Wind9 mph SW
Gusts15 mph
UV index5 – Moderate
Precip chance9%
Sunrise06:45
Sunset19:55
Mon · Tomorrow Mostly cloudy
85°70°0.4 mm⌄
Wind7 mph W
Gusts13 mph
UV index5 – Moderate
Precip chance38%
Sunrise06:46
Sunset19:54
Tuesday 1/9 Showers
90°73°1.5 mm⌄
Wind12 mph W
Gusts21 mph
UV index7 – High
Precip chance60%
Sunrise06:47
Sunset19:52
Wednesday 2/9 Sunny
91°74°7%⌄
Wind11 mph SW
Gusts24 mph
UV index8 – High
Precip chance7%
Sunrise06:48
Sunset19:50
Thursday 3/9 Sunny
92°71°0.2 mm⌄
Wind10 mph SW
Gusts24 mph
UV index8 – Very high
Precip chance17%
Sunrise06:49
Sunset19:49
Friday 4/9 Thunderstorms
82°74°16%⌄
Wind11 mph SW
Gusts32 mph
UV index6 – High
Precip chance16%
Sunrise06:50
Sunset19:47
Saturday 5/9 Mostly cloudy
86°70°13.4 mm⌄
Wind10 mph W
Gusts27 mph
UV index7 – High
Precip chance82%
Sunrise06:51
Sunset19:46
Sunday 6/9 Showers
74°64°9.6 mm⌄
Wind10 mph W
Gusts28 mph
UV index5 – Moderate
Precip chance91%
Sunrise06:52
Sunset19:44
Monday 7/9 Sunny
70°55°0.6 mm⌄
Wind9 mph W
Gusts24 mph
UV index5 – Moderate
Precip chance36%
Sunrise06:53
Sunset19:42
Tuesday 8/9 Mostly cloudy
63°58°25%⌄
Wind9 mph SW
Gusts24 mph
UV index4 – Moderate
Precip chance25%
Sunrise06:54
Sunset19:41
Wednesday 9/9 Mostly cloudy
73°55°11%⌄
Wind6 mph SW
Gusts18 mph
UV index6 – High
Precip chance11%
Sunrise06:55
Sunset19:39
Thursday 10/9 Sunny
73°62°13%⌄
Wind11 mph NW
Gusts27 mph
UV index6 – High
Precip chance13%
Sunrise06:56
Sunset19:37
Friday 11/9 Sunny
71°54°5%⌄
Wind8 mph N
Gusts22 mph
UV index6 – High
Precip chance5%
Sunrise06:57
Sunset19:36
Saturday 12/9 Mostly cloudy
73°53°8%⌄
Wind5 mph E
Gusts19 mph
UV index5 – Moderate
Precip chance8%
Sunrise06:58
Sunset19:34
Sunday 13/9 Rain (climatological)
73°58°5.2 mm⌄
Day≈67–78°
Night≈53–64°
Precip≈2.2 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 14/9 Partly cloudy (climatological)
74°59°20%⌄
Day≈69–80°
Night≈54–65°
Precip≈2.2 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 15/9 Partly cloudy (climatological)
78°62°20%⌄
Day≈73–83°
Night≈56–67°
Precip≈2.2 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 16/9 Rain (climatological)
74°59°5.0 mm⌄
Day≈69–80°
Night≈54–65°
Precip≈2.2 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 17/9 Partly cloudy (climatological)
67°55°20%⌄
Day≈62–73°
Night≈50–61°
Precip≈2.2 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Partly cloudy (climatological)
66°54°20%⌄
Day≈60–71°
Night≈49–59°
Precip≈2.2 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Rain (climatological)
71°57°5.6 mm⌄
Day≈65–76°
Night≈52–63°
Precip≈2.2 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Partly cloudy (climatological)
72°58°20%⌄
Day≈67–78°
Night≈53–64°
Precip≈2.2 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Partly cloudy (climatological)
76°60°20%⌄
Day≈71–82°
Night≈55–66°
Precip≈2.2 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 22/9 Rain (climatological)
78°61°4.5 mm⌄
Day≈72–83°
Night≈56–67°
Precip≈2.2 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 23/9 Partly cloudy (climatological)
75°60°20%⌄
Day≈69–80°
Night≈54–65°
Precip≈2.2 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 24/9 Partly cloudy (climatological)
71°57°20%⌄
Day≈65–76°
Night≈52–62°
Precip≈2.2 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 25/9 Rain (climatological)
68°56°7.3 mm⌄
Day≈63–74°
Night≈50–61°
Precip≈2.2 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 26/9 Partly cloudy (climatological)
67°55°20%⌄
Day≈62–73°
Night≈50–60°
Precip≈2.2 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 27/9 Partly cloudy (climatological)
70°57°20%⌄
Day≈65–76°
Night≈51–62°
Precip≈2.2 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 28/9 Rain (climatological)
77°61°3.4 mm⌄
Day≈71–82°
Night≈55–66°
Precip≈2.2 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 Castle Shannon, 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.