Caseyville · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
Caseyville & 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
41°
Mon, Sep 14
Coldest night
17°
Wed, Sep 16
Days with precip
2 / 14
of 14 forecast days
Nicest day
Thu, Sep 10
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 5 – Sun 6 Sep
39° 22°
57% precip chance
Sat 12 – Sun 13 Sep
40° 23°
57% precip chance
Sat 19 – Sun 20 Sep
38° 23°
typical range
Sat 26 – Sun 27 Sep
39° 24°
typical range
30 days — Caseyville
14 forecast + 16 climatology
Thu · Today Sunny
38°27°2%⌄
Wind9 mph W
Gusts18 mph
UV index9 – Very high
Precip chance2%
Sunrise06:31
Sunset19:27
Fri · Tomorrow Sunny
39°27°2%⌄
Wind10 mph E
Gusts15 mph
UV index8 – Very high
Precip chance2%
Sunrise06:32
Sunset19:26
Saturday 5/9 Mostly cloudy
39°22°2.0 mm⌄
Wind19 mph NE
Gusts34 mph
UV index7 – High
Precip chance57%
Sunrise06:32
Sunset19:24
Sunday 6/9 Sunny
36°22°1.0 mm⌄
Wind14 mph E
Gusts28 mph
UV index8 – High
Precip chance41%
Sunrise06:33
Sunset19:23
Monday 7/9 Sunny
37°19°4%⌄
Wind10 mph SE
Gusts28 mph
UV index9 – Very high
Precip chance4%
Sunrise06:34
Sunset19:21
Tuesday 8/9 Sunny
40°26°2%⌄
Wind13 mph S
Gusts28 mph
UV index9 – Very high
Precip chance2%
Sunrise06:35
Sunset19:20
Wednesday 9/9 Sunny
40°27°2%⌄
Wind16 mph S
Gusts33 mph
UV index9 – Very high
Precip chance2%
Sunrise06:36
Sunset19:18
Thursday 10/9 Mostly cloudy
30°20°5%⌄
Wind11 mph E
Gusts26 mph
UV index7 – High
Precip chance5%
Sunrise06:37
Sunset19:16
Friday 11/9 Sunny
34°18°4%⌄
Wind9 mph SE
Gusts21 mph
UV index8 – Very high
Precip chance4%
Sunrise06:38
Sunset19:15
Saturday 12/9 Mostly cloudy
37°23°5%⌄
Wind11 mph S
Gusts29 mph
UV index9 – Very high
Precip chance5%
Sunrise06:39
Sunset19:13
Sunday 13/9 Sunny
40°29°1.8 mm⌄
Wind24 mph W
Gusts41 mph
UV index9 – Very high
Precip chance57%
Sunrise06:39
Sunset19:12
Monday 14/9 Sunny
41°24°0.9 mm⌄
Wind17 mph NE
Gusts33 mph
UV index10 – Very high
Precip chance36%
Sunrise06:40
Sunset19:10
Tuesday 15/9 Mostly cloudy
33°21°7%⌄
Wind11 mph E
Gusts26 mph
UV index8 – Very high
Precip chance7%
Sunrise06:41
Sunset19:08
Wednesday 16/9 Mostly cloudy
31°17°6%⌄
Wind9 mph E
Gusts26 mph
UV index7 – High
Precip chance6%
Sunrise06:42
Sunset19:07
Thursday 17/9 Light rain (climatological)
36°23°1.8 mm⌄
Day≈33–39°
Night≈20–26°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Partly cloudy (climatological)
39°24°20%⌄
Day≈36–42°
Night≈21–27°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Partly cloudy (climatological)
38°24°20%⌄
Day≈35–41°
Night≈21–27°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Light rain (climatological)
37°23°1.1 mm⌄
Day≈34–40°
Night≈20–26°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Partly cloudy (climatological)
34°21°20%⌄
Day≈31–37°
Night≈18–24°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 22/9 Partly cloudy (climatological)
35°22°20%⌄
Day≈32–38°
Night≈19–25°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 23/9 Light rain (climatological)
34°21°2.0 mm⌄
Day≈31–37°
Night≈18–24°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 24/9 Partly cloudy (climatological)
36°23°20%⌄
Day≈33–39°
Night≈20–26°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 25/9 Partly cloudy (climatological)
39°25°20%⌄
Day≈36–42°
Night≈22–28°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 26/9 Light rain (climatological)
39°24°1.0 mm⌄
Day≈36–42°
Night≈21–27°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 27/9 Partly cloudy (climatological)
38°24°20%⌄
Day≈35–41°
Night≈21–27°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 28/9 Partly cloudy (climatological)
35°22°20%⌄
Day≈32–38°
Night≈19–25°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 29/9 Light rain (climatological)
35°22°1.4 mm⌄
Day≈32–38°
Night≈19–25°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 30/9 Partly cloudy (climatological)
35°22°20%⌄
Day≈32–38°
Night≈19–25°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 1/10 Partly cloudy (climatological)
32°18°20%⌄
Day≈29–35°
Night≈15–21°
Precip≈0.6 in / October
(climatological)Typical range for these dates · 1991–2020
Friday 2/10 Light rain (climatological)
34°19°1.3 mm⌄
Day≈31–37°
Night≈16–22°
Precip≈0.6 in / October
(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 Caseyville, 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.