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
107°
Wed, Sep 16
Coldest night
58°
Fri, Sep 11
Days with precip
2 / 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
104° 68°
58% precip chance
Sat 12 – Sun 13 Sep
103° 60°
64% precip chance
Sat 19 – Sun 20 Sep
102° 72°
typical range
Sat 26 – Sun 27 Sep
100° 72°
typical range
30 days — Vandalia
14 forecast + 16 climatology
Fri · Today Sunny
101°74°3%⌄
Wind13 mph NW
Gusts23 mph
UV index8 – Very high
Precip chance3%
Sunrise06:28
Sunset19:22
Sat · Tomorrow Sunny
104°74°3.8 mm⌄
Wind11 mph W
Gusts19 mph
UV index8 – Very high
Precip chance58%
Sunrise06:28
Sunset19:21
Sunday 6/9 Sunny
91°68°5%⌄
Wind13 mph NE
Gusts26 mph
UV index8 – High
Precip chance5%
Sunrise06:29
Sunset19:19
Monday 7/9 Sunny
90°60°3%⌄
Wind10 mph E
Gusts23 mph
UV index8 – High
Precip chance3%
Sunrise06:30
Sunset19:18
Tuesday 8/9 Sunny
98°63°3%⌄
Wind11 mph SW
Gusts28 mph
UV index8 – High
Precip chance3%
Sunrise06:31
Sunset19:16
Wednesday 9/9 Sunny
100°76°4%⌄
Wind16 mph SW
Gusts35 mph
UV index9 – Very high
Precip chance4%
Sunrise06:32
Sunset19:14
Thursday 10/9 Mostly cloudy
89°64°8%⌄
Wind12 mph N
Gusts20 mph
UV index7 – High
Precip chance8%
Sunrise06:33
Sunset19:13
Friday 11/9 Mostly cloudy
73°58°11%⌄
Wind8 mph E
Gusts18 mph
UV index5 – Moderate
Precip chance11%
Sunrise06:34
Sunset19:11
Saturday 12/9 Showers
82°60°4.0 mm⌄
Wind10 mph S
Gusts21 mph
UV index7 – High
Precip chance64%
Sunrise06:35
Sunset19:10
Sunday 13/9 Sunny
103°72°2%⌄
Wind16 mph SW
Gusts32 mph
UV index9 – Very high
Precip chance2%
Sunrise06:36
Sunset19:08
Monday 14/9 Sunny
107°79°1%⌄
Wind13 mph W
Gusts29 mph
UV index10 – Very high
Precip chance1%
Sunrise06:36
Sunset19:06
Tuesday 15/9 Sunny
105°79°0%⌄
Wind14 mph W
Gusts20 mph
UV index10 – Very high
Precip chance0%
Sunrise06:37
Sunset19:05
Wednesday 16/9 Sunny
107°81°1%⌄
Wind10 mph SW
Gusts13 mph
UV index10 – Very high
Precip chance1%
Sunrise06:38
Sunset19:03
Thursday 17/9 Sunny
106°79°4%⌄
Wind11 mph E
Gusts24 mph
UV index10 – Very high
Precip chance4%
Sunrise06:39
Sunset19:02
Friday 18/9 Light rain (climatological)
96°70°1.7 mm⌄
Day≈90–101°
Night≈64–75°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Partly cloudy (climatological)
99°72°20%⌄
Day≈94–105°
Night≈66–77°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Partly cloudy (climatological)
102°74°20%⌄
Day≈97–108°
Night≈68–79°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Light rain (climatological)
100°72°1.8 mm⌄
Day≈94–105°
Night≈67–78°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 22/9 Partly cloudy (climatological)
94°69°20%⌄
Day≈89–99°
Night≈63–74°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 23/9 Partly cloudy (climatological)
92°67°20%⌄
Day≈87–97°
Night≈62–73°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 24/9 Light rain (climatological)
91°67°1.9 mm⌄
Day≈86–96°
Night≈62–72°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 25/9 Partly cloudy (climatological)
99°72°20%⌄
Day≈93–104°
Night≈66–77°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 26/9 Partly cloudy (climatological)
100°72°20%⌄
Day≈94–105°
Night≈67–77°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 27/9 Light rain (climatological)
100°72°1.8 mm⌄
Day≈94–105°
Night≈67–78°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 28/9 Partly cloudy (climatological)
98°71°20%⌄
Day≈92–103°
Night≈65–76°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 29/9 Partly cloudy (climatological)
96°70°20%⌄
Day≈90–101°
Night≈64–75°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 30/9 Light rain (climatological)
93°68°1.8 mm⌄
Day≈87–98°
Night≈62–73°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 1/10 Partly cloudy (climatological)
80°57°20%⌄
Day≈74–85°
Night≈51–62°
Precip≈0.7 in / October
(climatological)Typical range for these dates · 1991–2020
Friday 2/10 Partly cloudy (climatological)
84°59°20%⌄
Day≈79–90°
Night≈54–65°
Precip≈0.7 in / October
(climatological)Typical range for these dates · 1991–2020
Saturday 3/10 Light rain (climatological)
89°62°1.2 mm⌄
Day≈83–94°
Night≈56–67°
Precip≈0.7 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.