Vandalia · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
Vandalia & 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
15°
Wed, Sep 16
Days with precip
3 / 14
of 14 forecast days
Nicest day
Wed, Sep 16
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 5 – Sun 6 Sep
38° 21°
57% precip chance
Sat 12 – Sun 13 Sep
39° 22°
4% precip chance
Sat 19 – Sun 20 Sep
40° 23°
typical range
Sat 26 – Sun 27 Sep
38° 22°
typical range
30 days — Vandalia
14 forecast + 16 climatology
Thu · Today Sunny
38°24°2%⌄
Wind11 mph W
Gusts22 mph
UV index9 – Very high
Precip chance2%
Sunrise06:27
Sunset19:24
Fri · Tomorrow Sunny
38°26°0.2 mm⌄
Wind9 mph W
Gusts18 mph
UV index8 – Very high
Precip chance17%
Sunrise06:28
Sunset19:22
Saturday 5/9 Sunny
38°21°2.8 mm⌄
Wind20 mph N
Gusts38 mph
UV index7 – High
Precip chance57%
Sunrise06:28
Sunset19:21
Sunday 6/9 Sunny
35°21°0.3 mm⌄
Wind12 mph NE
Gusts27 mph
UV index8 – High
Precip chance18%
Sunrise06:29
Sunset19:19
Monday 7/9 Sunny
36°18°4%⌄
Wind11 mph E
Gusts25 mph
UV index9 – Very high
Precip chance4%
Sunrise06:30
Sunset19:18
Tuesday 8/9 Mostly cloudy
39°26°5%⌄
Wind15 mph SW
Gusts33 mph
UV index9 – Very high
Precip chance5%
Sunrise06:31
Sunset19:16
Wednesday 9/9 Sunny
39°25°1%⌄
Wind15 mph SW
Gusts35 mph
UV index9 – Very high
Precip chance1%
Sunrise06:32
Sunset19:14
Thursday 10/9 Sunny
33°20°1.3 mm⌄
Wind12 mph NE
Gusts25 mph
UV index8 – Very high
Precip chance57%
Sunrise06:33
Sunset19:13
Friday 11/9 Sunny
34°16°2%⌄
Wind10 mph SE
Gusts22 mph
UV index8 – Very high
Precip chance2%
Sunrise06:34
Sunset19:11
Saturday 12/9 Sunny
37°22°3%⌄
Wind14 mph S
Gusts32 mph
UV index9 – Very high
Precip chance3%
Sunrise06:35
Sunset19:10
Sunday 13/9 Sunny
39°27°4%⌄
Wind18 mph SW
Gusts33 mph
UV index9 – Very high
Precip chance4%
Sunrise06:36
Sunset19:08
Monday 14/9 Partly cloudy
41°24°2.3 mm⌄
Wind16 mph W
Gusts32 mph
UV index10 – Very high
Precip chance57%
Sunrise06:36
Sunset19:06
Tuesday 15/9 Mostly cloudy
33°20°4%⌄
Wind12 mph NE
Gusts26 mph
UV index8 – Very high
Precip chance4%
Sunrise06:37
Sunset19:05
Wednesday 16/9 Sunny
32°15°3%⌄
Wind13 mph NE
Gusts27 mph
UV index8 – Very high
Precip chance3%
Sunrise06:38
Sunset19:03
Thursday 17/9 Light rain (climatological)
36°21°1.5 mm⌄
Day≈33–39°
Night≈18–24°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Partly cloudy (climatological)
38°23°20%⌄
Day≈35–41°
Night≈20–26°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Partly cloudy (climatological)
40°24°20%⌄
Day≈37–43°
Night≈21–27°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Light rain (climatological)
38°23°1.6 mm⌄
Day≈35–41°
Night≈20–26°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Partly cloudy (climatological)
35°21°20%⌄
Day≈32–38°
Night≈18–24°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 22/9 Partly cloudy (climatological)
34°20°20%⌄
Day≈31–37°
Night≈17–23°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 23/9 Light rain (climatological)
33°20°1.7 mm⌄
Day≈30–36°
Night≈17–23°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 24/9 Partly cloudy (climatological)
38°22°20%⌄
Day≈35–41°
Night≈19–25°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 25/9 Partly cloudy (climatological)
38°23°20%⌄
Day≈35–41°
Night≈20–26°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 26/9 Light rain (climatological)
38°23°1.6 mm⌄
Day≈35–41°
Night≈20–26°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 27/9 Partly cloudy (climatological)
37°22°20%⌄
Day≈34–40°
Night≈19–25°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 28/9 Partly cloudy (climatological)
36°21°20%⌄
Day≈33–39°
Night≈18–24°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 29/9 Light rain (climatological)
34°20°1.6 mm⌄
Day≈31–37°
Night≈17–23°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 30/9 Partly cloudy (climatological)
33°20°20%⌄
Day≈30–36°
Night≈17–23°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 1/10 Partly cloudy (climatological)
30°16°20%⌄
Day≈27–33°
Night≈13–19°
Precip≈0.6 in / October
(climatological)Typical range for these dates · 1991–2020
Friday 2/10 Light rain (climatological)
32°17°1.1 mm⌄
Day≈29–35°
Night≈14–20°
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 Vandalia, 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.