Monticello · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
Monticello & 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
101°
Sun, Aug 23
Coldest night
71°
Thu, Aug 27
Days with precip
9 / 14
of 14 forecast days
Nicest day
Tue, Sep 1
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 29 – Sun 30 Aug
93° 72°
83% precip chance
Sat 5 – Sun 6 Sep
92° 71°
typical range
Sat 12 – Sun 13 Sep
91° 67°
typical range
Sat 19 – Sun 20 Sep
90° 69°
typical range
30 days — Monticello
14 forecast + 16 climatology
Sun · Today Sunny
101°74°7.8 mm⌄
Wind13 mph E
Gusts26 mph
UV index10 – Very high
Precip chance76%
Sunrise06:30
Sunset19:35
Mon · Tomorrow Mostly cloudy
95°72°0.7 mm⌄
Wind9 mph NW
Gusts15 mph
UV index5 – Moderate
Precip chance54%
Sunrise06:31
Sunset19:34
Tuesday 25/8 Mostly cloudy
94°75°12%⌄
Wind7 mph S
Gusts18 mph
UV index10 – Very high
Precip chance12%
Sunrise06:32
Sunset19:33
Wednesday 26/8 Sunny
95°74°0.8 mm⌄
Wind14 mph SE
Gusts25 mph
UV index8 – Very high
Precip chance36%
Sunrise06:32
Sunset19:31
Thursday 27/8 Showers
86°71°17.7 mm⌄
Wind9 mph W
Gusts21 mph
UV index8 – Very high
Precip chance88%
Sunrise06:33
Sunset19:30
Friday 28/8 Fog
91°73°5.6 mm⌄
Wind6 mph SE
Gusts17 mph
UV index8 – Very high
Precip chance85%
Sunrise06:33
Sunset19:29
Saturday 29/8 Showers
91°72°6.5 mm⌄
Wind6 mph SE
Gusts16 mph
UV index7 – High
Precip chance83%
Sunrise06:34
Sunset19:28
Sunday 30/8 Mostly cloudy
93°73°1.3 mm⌄
Wind6 mph S
Gusts18 mph
UV index7 – High
Precip chance57%
Sunrise06:35
Sunset19:27
Monday 31/8 Sunny
95°74°0.3 mm⌄
Wind8 mph SE
Gusts22 mph
UV index8 – Very high
Precip chance36%
Sunrise06:35
Sunset19:25
Tuesday 1/9 Sunny
96°73°8%⌄
Wind6 mph S
Gusts20 mph
UV index9 – Very high
Precip chance8%
Sunrise06:36
Sunset19:24
Wednesday 2/9 Sunny
99°73°6.3 mm⌄
Wind19 mph E
Gusts25 mph
UV index9 – Very high
Precip chance68%
Sunrise06:36
Sunset19:23
Thursday 3/9 Thunderstorms
101°72°2.7 mm⌄
Wind16 mph E
Gusts31 mph
UV index8 – Very high
Precip chance60%
Sunrise06:37
Sunset19:22
Friday 4/9 Sunny
97°73°2.2 mm⌄
Wind11 mph NW
Gusts25 mph
UV index9 – Very high
Precip chance57%
Sunrise06:38
Sunset19:20
Saturday 5/9 Mostly cloudy
83°73°9.1 mm⌄
Wind7 mph N
Gusts21 mph
UV index6 – High
Precip chance86%
Sunrise06:38
Sunset19:19
Sunday 6/9 Rain (climatological)
92°71°6.6 mm⌄
Day≈87–97°
Night≈65–76°
Precip≈5.2 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 7/9 Partly cloudy (climatological)
96°73°20%⌄
Day≈90–101°
Night≈67–78°
Precip≈5.2 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 8/9 Partly cloudy (climatological)
93°71°20%⌄
Day≈88–98°
Night≈66–77°
Precip≈5.2 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 9/9 Rain (climatological)
94°72°11.0 mm⌄
Day≈88–99°
Night≈67–77°
Precip≈5.2 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 10/9 Partly cloudy (climatological)
91°70°20%⌄
Day≈85–96°
Night≈65–75°
Precip≈5.2 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 11/9 Partly cloudy (climatological)
83°66°20%⌄
Day≈78–89°
Night≈60–71°
Precip≈5.2 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 12/9 Rain (climatological)
85°67°10.1 mm⌄
Day≈79–90°
Night≈61–72°
Precip≈5.2 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 13/9 Partly cloudy (climatological)
91°71°20%⌄
Day≈86–97°
Night≈65–76°
Precip≈5.2 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 14/9 Partly cloudy (climatological)
93°71°20%⌄
Day≈88–98°
Night≈66–77°
Precip≈5.2 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 15/9 Rain (climatological)
92°71°17.6 mm⌄
Day≈87–97°
Night≈65–76°
Precip≈5.2 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 16/9 Partly cloudy (climatological)
92°71°20%⌄
Day≈87–97°
Night≈65–76°
Precip≈5.2 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 17/9 Partly cloudy (climatological)
90°69°20%⌄
Day≈84–95°
Night≈64–75°
Precip≈5.2 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Rain (climatological)
84°66°16.3 mm⌄
Day≈78–89°
Night≈60–71°
Precip≈5.2 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Partly cloudy (climatological)
88°69°20%⌄
Day≈83–93°
Night≈63–74°
Precip≈5.2 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Partly cloudy (climatological)
90°70°20%⌄
Day≈85–96°
Night≈64–75°
Precip≈5.2 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Rain (climatological)
93°71°8.4 mm⌄
Day≈88–98°
Night≈66–77°
Precip≈5.2 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 Monticello, 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.