DeKalb · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
DeKalb & 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
82°
Fri, Aug 21
Coldest night
56°
Thu, Sep 3
Days with precip
4 / 14
of 14 forecast days
Nicest day
Sun, Aug 23
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 22 – Sun 23 Aug
75° 57°
57% precip chance
Sat 29 – Sun 30 Aug
80° 63°
85% precip chance
Sat 5 – Sun 6 Sep
70° 55°
typical range
Sat 12 – Sun 13 Sep
73° 56°
typical range
30 days — DeKalb
14 forecast + 16 climatology
Fri · Today Mostly cloudy
82°60°7.7 mm⌄
Wind10 mph SW
Gusts19 mph
UV index6 – High
Precip chance77%
Sunrise06:09
Sunset19:46
Sat · Tomorrow Sunny
75°62°1.9 mm⌄
Wind14 mph NW
Gusts28 mph
UV index7 – High
Precip chance57%
Sunrise06:10
Sunset19:45
Sunday 23/8 Sunny
71°57°10%⌄
Wind9 mph NE
Gusts25 mph
UV index7 – High
Precip chance10%
Sunrise06:11
Sunset19:43
Monday 24/8 Mostly cloudy
71°58°21%⌄
Wind8 mph E
Gusts14 mph
UV index8 – High
Precip chance21%
Sunrise06:12
Sunset19:42
Tuesday 25/8 Sunny
74°59°0.4 mm⌄
Wind9 mph S
Gusts17 mph
UV index5 – Moderate
Precip chance39%
Sunrise06:13
Sunset19:40
Wednesday 26/8 Sunny
80°67°3.6 mm⌄
Wind12 mph W
Gusts25 mph
UV index7 – High
Precip chance69%
Sunrise06:14
Sunset19:39
Thursday 27/8 Sunny
74°62°11%⌄
Wind9 mph N
Gusts13 mph
UV index6 – High
Precip chance11%
Sunrise06:15
Sunset19:37
Friday 28/8 Mostly cloudy
76°63°15%⌄
Wind10 mph SE
Gusts25 mph
UV index6 – High
Precip chance15%
Sunrise06:16
Sunset19:35
Saturday 29/8 Showers
80°66°6.4 mm⌄
Wind14 mph SE
Gusts34 mph
UV index7 – High
Precip chance85%
Sunrise06:17
Sunset19:34
Sunday 30/8 Sunny
76°63°7%⌄
Wind13 mph N
Gusts26 mph
UV index6 – High
Precip chance7%
Sunrise06:18
Sunset19:32
Monday 31/8 Mostly cloudy
70°62°22%⌄
Wind10 mph SE
Gusts24 mph
UV index5 – Moderate
Precip chance22%
Sunrise06:19
Sunset19:30
Tuesday 1/9 Sunny
81°65°14%⌄
Wind12 mph S
Gusts26 mph
UV index7 – High
Precip chance14%
Sunrise06:20
Sunset19:29
Wednesday 2/9 Sunny
69°57°7%⌄
Wind12 mph NE
Gusts26 mph
UV index6 – High
Precip chance7%
Sunrise06:21
Sunset19:27
Thursday 3/9 Mostly cloudy
64°56°0.1 mm⌄
Wind13 mph E
Gusts26 mph
UV index5 – Moderate
Precip chance25%
Sunrise06:22
Sunset19:25
Friday 4/9 Rain (climatological)
69°56°3.5 mm⌄
Day≈64–74°
Night≈50–61°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 5/9 Partly cloudy (climatological)
68°55°20%⌄
Day≈62–73°
Night≈49–60°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 6/9 Partly cloudy (climatological)
70°56°20%⌄
Day≈64–75°
Night≈51–61°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 7/9 Rain (climatological)
68°55°4.5 mm⌄
Day≈62–73°
Night≈49–60°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 8/9 Partly cloudy (climatological)
62°51°20%⌄
Day≈57–68°
Night≈46–57°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 9/9 Partly cloudy (climatological)
63°52°20%⌄
Day≈58–69°
Night≈47–57°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 10/9 Rain (climatological)
64°53°2.5 mm⌄
Day≈58–69°
Night≈47–58°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 11/9 Partly cloudy (climatological)
65°53°20%⌄
Day≈60–71°
Night≈48–59°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 12/9 Partly cloudy (climatological)
73°58°20%⌄
Day≈68–78°
Night≈53–63°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 13/9 Rain (climatological)
69°56°4.4 mm⌄
Day≈64–74°
Night≈50–61°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 14/9 Partly cloudy (climatological)
67°54°20%⌄
Day≈61–72°
Night≈49–60°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 15/9 Partly cloudy (climatological)
63°52°20%⌄
Day≈58–68°
Night≈46–57°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 16/9 Rain (climatological)
61°51°3.1 mm⌄
Day≈56–66°
Night≈45–56°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 17/9 Partly cloudy (climatological)
64°52°20%⌄
Day≈58–69°
Night≈47–58°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Partly cloudy (climatological)
67°54°20%⌄
Day≈62–72°
Night≈49–60°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Rain (climatological)
70°56°5.7 mm⌄
Day≈65–76°
Night≈51–62°
Precip≈1.7 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 DeKalb, 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.