Mount Vernon · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
Mount Vernon & 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
90°
Tue, Sep 1
Coldest night
66°
Tue, Aug 25
Days with precip
6 / 14
of 14 forecast days
Nicest day
Wed, Aug 26
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 29 – Sun 30 Aug
84° 70°
48% precip chance
Sat 5 – Sun 6 Sep
81° 64°
typical range
Sat 12 – Sun 13 Sep
77° 63°
typical range
Sat 19 – Sun 20 Sep
76° 62°
typical range
30 days — Mount Vernon
14 forecast + 16 climatology
Sun · Today Showers
85°68°25.9 mm⌄
Wind15 mph W
Gusts18 mph
UV index8 – High
Precip chance72%
Sunrise06:26
Sunset19:51
Mon · Tomorrow Sunny
83°67°2%⌄
Wind15 mph W
Gusts25 mph
UV index7 – High
Precip chance2%
Sunrise06:27
Sunset19:49
Tuesday 25/8 Sunny
85°66°4%⌄
Wind10 mph W
Gusts17 mph
UV index8 – High
Precip chance4%
Sunrise06:28
Sunset19:48
Wednesday 26/8 Mostly cloudy
83°70°7%⌄
Wind7 mph SE
Gusts18 mph
UV index7 – High
Precip chance7%
Sunrise06:29
Sunset19:46
Thursday 27/8 Mostly cloudy
85°68°22.2 mm⌄
Wind16 mph SE
Gusts27 mph
UV index7 – High
Precip chance81%
Sunrise06:30
Sunset19:45
Friday 28/8 Sunny
86°69°1.4 mm⌄
Wind8 mph SE
Gusts15 mph
UV index7 – High
Precip chance57%
Sunrise06:31
Sunset19:43
Saturday 29/8 Showers
84°75°0.5 mm⌄
Wind9 mph SE
Gusts15 mph
UV index7 – High
Precip chance36%
Sunrise06:32
Sunset19:42
Sunday 30/8 Mostly cloudy
82°70°1.0 mm⌄
Wind8 mph SE
Gusts17 mph
UV index7 – High
Precip chance48%
Sunrise06:33
Sunset19:40
Monday 31/8 Sunny
86°71°7.6 mm⌄
Wind19 mph S
Gusts32 mph
UV index8 – Very high
Precip chance74%
Sunrise06:34
Sunset19:39
Tuesday 1/9 Mostly cloudy
90°71°36.2 mm⌄
Wind15 mph S
Gusts32 mph
UV index7 – High
Precip chance84%
Sunrise06:35
Sunset19:37
Wednesday 2/9 Mostly cloudy
87°71°1.2 mm⌄
Wind8 mph NE
Gusts15 mph
UV index7 – High
Precip chance57%
Sunrise06:35
Sunset19:36
Thursday 3/9 Sunny
81°69°0.6 mm⌄
Wind9 mph NE
Gusts17 mph
UV index7 – High
Precip chance37%
Sunrise06:36
Sunset19:34
Friday 4/9 Mostly cloudy
82°71°12%⌄
Wind10 mph SE
Gusts15 mph
UV index7 – High
Precip chance12%
Sunrise06:37
Sunset19:33
Saturday 5/9 Mostly cloudy
81°73°22%⌄
Wind9 mph E
Gusts12 mph
UV index6 – High
Precip chance22%
Sunrise06:38
Sunset19:31
Sunday 6/9 Rain (climatological)
77°64°14.0 mm⌄
Day≈71–82°
Night≈58–69°
Precip≈8.3 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 7/9 Partly cloudy (climatological)
82°67°20%⌄
Day≈77–87°
Night≈61–72°
Precip≈8.3 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 8/9 Partly cloudy (climatological)
82°67°20%⌄
Day≈76–87°
Night≈61–72°
Precip≈8.3 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 9/9 Rain (climatological)
79°65°26.6 mm⌄
Day≈73–84°
Night≈59–70°
Precip≈8.3 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 10/9 Partly cloudy (climatological)
74°62°20%⌄
Day≈68–79°
Night≈56–67°
Precip≈8.3 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 11/9 Partly cloudy (climatological)
72°61°20%⌄
Day≈67–78°
Night≈56–66°
Precip≈8.3 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 12/9 Rain (climatological)
76°63°24.5 mm⌄
Day≈70–81°
Night≈58–68°
Precip≈8.3 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 13/9 Partly cloudy (climatological)
77°64°20%⌄
Day≈71–82°
Night≈58–69°
Precip≈8.3 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 14/9 Partly cloudy (climatological)
83°67°20%⌄
Day≈78–88°
Night≈62–73°
Precip≈8.3 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 15/9 Rain (climatological)
84°68°21.7 mm⌄
Day≈79–90°
Night≈63–74°
Precip≈8.3 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 16/9 Partly cloudy (climatological)
82°67°20%⌄
Day≈76–87°
Night≈61–72°
Precip≈8.3 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 17/9 Partly cloudy (climatological)
77°64°20%⌄
Day≈71–82°
Night≈58–69°
Precip≈8.3 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Rain (climatological)
71°60°11.9 mm⌄
Day≈65–76°
Night≈55–65°
Precip≈8.3 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Partly cloudy (climatological)
73°62°20%⌄
Day≈68–79°
Night≈56–67°
Precip≈8.3 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Partly cloudy (climatological)
76°64°20%⌄
Day≈71–82°
Night≈58–69°
Precip≈8.3 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Rain (climatological)
79°65°11.9 mm⌄
Day≈73–84°
Night≈59–70°
Precip≈8.3 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 Mount Vernon, 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.