Koontz Lake · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
Koontz Lake & 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°
Mon, Sep 14
Coldest night
55°
Sat, Sep 12
Days with precip
3 / 14
of 14 forecast days
Nicest day
Sat, Sep 12
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 5 – Sun 6 Sep
82° 63°
74% precip chance
Sat 12 – Sun 13 Sep
83° 55°
8% precip chance
Sat 19 – Sun 20 Sep
85° 68°
typical range
Sat 26 – Sun 27 Sep
85° 68°
typical range
30 days — Koontz Lake
14 forecast + 16 climatology
Fri · Today Sunny
88°74°8.8 mm⌄
Wind10 mph E
Gusts21 mph
UV index7 – High
Precip chance75%
Sunrise06:15
Sunset19:14
Sat · Tomorrow Sunny
82°71°5.6 mm⌄
Wind13 mph N
Gusts25 mph
UV index7 – High
Precip chance74%
Sunrise06:16
Sunset19:12
Sunday 6/9 Sunny
77°63°16%⌄
Wind8 mph NE
Gusts21 mph
UV index7 – High
Precip chance16%
Sunrise06:17
Sunset19:11
Monday 7/9 Sunny
76°58°13%⌄
Wind9 mph E
Gusts23 mph
UV index6 – High
Precip chance13%
Sunrise06:18
Sunset19:09
Tuesday 8/9 Mostly cloudy
78°61°17%⌄
Wind10 mph SE
Gusts23 mph
UV index7 – High
Precip chance17%
Sunrise06:19
Sunset19:07
Wednesday 9/9 Sunny
84°70°0.6 mm⌄
Wind13 mph SW
Gusts31 mph
UV index7 – High
Precip chance43%
Sunrise06:20
Sunset19:06
Thursday 10/9 Mostly cloudy
77°65°0.6 mm⌄
Wind9 mph N
Gusts24 mph
UV index6 – High
Precip chance48%
Sunrise06:21
Sunset19:04
Friday 11/9 Partly cloudy
67°59°0.1 mm⌄
Wind10 mph NE
Gusts22 mph
UV index4 – Moderate
Precip chance27%
Sunrise06:22
Sunset19:02
Saturday 12/9 Sunny
73°55°8%⌄
Wind11 mph SE
Gusts26 mph
UV index6 – High
Precip chance8%
Sunrise06:23
Sunset19:01
Sunday 13/9 Sunny
83°62°5%⌄
Wind13 mph S
Gusts30 mph
UV index7 – High
Precip chance5%
Sunrise06:24
Sunset18:59
Monday 14/9 Sunny
90°72°7%⌄
Wind11 mph S
Gusts27 mph
UV index8 – Very high
Precip chance7%
Sunrise06:25
Sunset18:57
Tuesday 15/9 Sunny
88°71°0.8 mm⌄
Wind14 mph SW
Gusts27 mph
UV index8 – Very high
Precip chance41%
Sunrise06:26
Sunset18:55
Wednesday 16/9 Sunny
79°65°4%⌄
Wind8 mph N
Gusts17 mph
UV index7 – High
Precip chance4%
Sunrise06:27
Sunset18:54
Thursday 17/9 Mostly cloudy
69°61°2.8 mm⌄
Wind13 mph S
Gusts26 mph
UV index5 – Moderate
Precip chance63%
Sunrise06:28
Sunset18:52
Friday 18/9 Rain (climatological)
78°64°4.2 mm⌄
Day≈73–84°
Night≈59–70°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Partly cloudy (climatological)
85°68°20%⌄
Day≈80–90°
Night≈63–74°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Partly cloudy (climatological)
84°68°20%⌄
Day≈78–89°
Night≈62–73°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Rain (climatological)
82°67°4.5 mm⌄
Day≈77–88°
Night≈61–72°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 22/9 Partly cloudy (climatological)
75°62°20%⌄
Day≈69–80°
Night≈57–68°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 23/9 Partly cloudy (climatological)
73°61°20%⌄
Day≈67–78°
Night≈56–66°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 24/9 Rain (climatological)
75°62°4.8 mm⌄
Day≈70–80°
Night≈57–68°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 25/9 Partly cloudy (climatological)
81°66°20%⌄
Day≈75–86°
Night≈60–71°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 26/9 Partly cloudy (climatological)
85°68°20%⌄
Day≈80–91°
Night≈63–74°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 27/9 Rain (climatological)
85°68°2.8 mm⌄
Day≈80–90°
Night≈63–74°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 28/9 Partly cloudy (climatological)
83°67°20%⌄
Day≈78–89°
Night≈62–73°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 29/9 Partly cloudy (climatological)
79°65°20%⌄
Day≈73–84°
Night≈59–70°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 30/9 Rain (climatological)
78°64°2.4 mm⌄
Day≈72–83°
Night≈58–69°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 1/10 Partly cloudy (climatological)
63°51°20%⌄
Day≈58–69°
Night≈46–57°
Precip≈1.7 in / October
(climatological)Typical range for these dates · 1991–2020
Friday 2/10 Partly cloudy (climatological)
65°52°20%⌄
Day≈59–70°
Night≈47–57°
Precip≈1.7 in / October
(climatological)Typical range for these dates · 1991–2020
Saturday 3/10 Rain (climatological)
71°56°4.5 mm⌄
Day≈66–77°
Night≈51–61°
Precip≈1.7 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 Koontz Lake, 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.