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
105°
Sun, Aug 23
Coldest night
71°
Sat, Aug 29
Days with precip
4 / 14
of 14 forecast days
Nicest day
Wed, Sep 2
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 29 – Sun 30 Aug
93° 71°
72% precip chance
Sat 5 – Sun 6 Sep
103° 73°
typical range
Sat 12 – Sun 13 Sep
94° 71°
typical range
Sat 19 – Sun 20 Sep
93° 70°
typical range
30 days — Monticello
14 forecast + 16 climatology
Sun · Today Sunny
105°77°0.4 mm⌄
Wind10 mph S
Gusts18 mph
UV index9 – Very high
Precip chance36%
Sunrise06:35
Sunset19:37
Mon · Tomorrow Mostly cloudy
100°78°13%⌄
Wind10 mph SE
Gusts19 mph
UV index10 – Very high
Precip chance13%
Sunrise06:36
Sunset19:36
Tuesday 25/8 Sunny
99°77°6%⌄
Wind10 mph S
Gusts18 mph
UV index10 – Very high
Precip chance6%
Sunrise06:36
Sunset19:35
Wednesday 26/8 Sunny
100°76°1.4 mm⌄
Wind9 mph SW
Gusts22 mph
UV index10 – Very high
Precip chance57%
Sunrise06:37
Sunset19:34
Thursday 27/8 Showers
95°77°0.4 mm⌄
Wind7 mph W
Gusts16 mph
UV index7 – High
Precip chance36%
Sunrise06:38
Sunset19:33
Friday 28/8 Showers
79°75°5.8 mm⌄
Wind5 mph SE
Gusts8 mph
UV index6 – High
Precip chance82%
Sunrise06:38
Sunset19:32
Saturday 29/8 Showers
87°71°1.8 mm⌄
Wind5 mph SW
Gusts12 mph
UV index7 – High
Precip chance71%
Sunrise06:39
Sunset19:31
Sunday 30/8 Showers
93°73°5.0 mm⌄
Wind11 mph S
Gusts24 mph
UV index8 – Very high
Precip chance72%
Sunrise06:39
Sunset19:29
Monday 31/8 Partly cloudy
95°73°0.2 mm⌄
Wind7 mph S
Gusts13 mph
UV index9 – Very high
Precip chance21%
Sunrise06:40
Sunset19:28
Tuesday 1/9 Sunny
98°76°4%⌄
Wind8 mph SE
Gusts16 mph
UV index9 – Very high
Precip chance4%
Sunrise06:40
Sunset19:27
Wednesday 2/9 Sunny
98°76°4%⌄
Wind9 mph SE
Gusts17 mph
UV index9 – Very high
Precip chance4%
Sunrise06:41
Sunset19:26
Thursday 3/9 Sunny
101°76°4%⌄
Wind7 mph S
Gusts15 mph
UV index9 – Very high
Precip chance4%
Sunrise06:41
Sunset19:25
Friday 4/9 Sunny
104°78°2%⌄
Wind6 mph SE
Gusts14 mph
UV index9 – Very high
Precip chance2%
Sunrise06:42
Sunset19:23
Saturday 5/9 Sunny
103°75°0.8 mm⌄
Wind9 mph S
Gusts15 mph
UV index9 – Very high
Precip chance36%
Sunrise06:43
Sunset19:22
Sunday 6/9 Rain (climatological)
94°73°3.5 mm⌄
Day≈89–99°
Night≈68–78°
Precip≈1.3 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 7/9 Partly cloudy (climatological)
96°74°20%⌄
Day≈91–101°
Night≈69–80°
Precip≈1.3 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 8/9 Partly cloudy (climatological)
100°76°20%⌄
Day≈94–105°
Night≈71–82°
Precip≈1.3 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 9/9 Rain (climatological)
93°73°2.2 mm⌄
Day≈88–99°
Night≈67–78°
Precip≈1.3 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 10/9 Partly cloudy (climatological)
89°70°20%⌄
Day≈83–94°
Night≈65–76°
Precip≈1.3 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 11/9 Partly cloudy (climatological)
91°71°20%⌄
Day≈86–97°
Night≈66–77°
Precip≈1.3 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 12/9 Rain (climatological)
90°71°4.5 mm⌄
Day≈84–95°
Night≈65–76°
Precip≈1.3 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 13/9 Partly cloudy (climatological)
94°73°20%⌄
Day≈89–100°
Night≈68–79°
Precip≈1.3 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 14/9 Partly cloudy (climatological)
98°76°20%⌄
Day≈93–104°
Night≈70–81°
Precip≈1.3 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 15/9 Rain (climatological)
96°74°3.2 mm⌄
Day≈91–101°
Night≈69–80°
Precip≈1.3 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 16/9 Partly cloudy (climatological)
93°73°20%⌄
Day≈88–99°
Night≈67–78°
Precip≈1.3 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 17/9 Partly cloudy (climatological)
93°72°20%⌄
Day≈87–98°
Night≈67–78°
Precip≈1.3 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Rain (climatological)
91°71°2.8 mm⌄
Day≈85–96°
Night≈66–76°
Precip≈1.3 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Partly cloudy (climatological)
89°70°20%⌄
Day≈83–94°
Night≈65–75°
Precip≈1.3 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Partly cloudy (climatological)
93°73°20%⌄
Day≈88–99°
Night≈67–78°
Precip≈1.3 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Rain (climatological)
97°75°2.3 mm⌄
Day≈92–103°
Night≈70–81°
Precip≈1.3 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 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.