South Bay · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
South Bay & 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
32°
Fri, Sep 4
Coldest night
24°
Mon, Aug 31
Days with precip
12 / 14
of 14 forecast days
Nicest day
Thu, Sep 10
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 5 – Sun 6 Sep
31° 26°
86% precip chance
Sat 12 – Sun 13 Sep
31° 27°
64% precip chance
Sat 19 – Sun 20 Sep
27° 24°
typical range
Sat 26 – Sun 27 Sep
28° 23°
typical range
30 days — South Bay
14 forecast + 16 climatology
Mon · Today Light rain
31°24°19.6 mm⌄
Wind13 mph NE
Gusts19 mph
UV index11 – Extreme
Precip chance86%
Sunrise07:02
Sunset19:44
Tue · Tomorrow Showers
31°27°17.2 mm⌄
Wind12 mph NE
Gusts18 mph
UV index11 – Very high
Precip chance79%
Sunrise07:02
Sunset19:43
Wednesday 2/9 Showers
31°27°12.0 mm⌄
Wind13 mph E
Gusts19 mph
UV index10 – Very high
Precip chance81%
Sunrise07:03
Sunset19:42
Thursday 3/9 Mostly cloudy
30°25°64.3 mm⌄
Wind13 mph E
Gusts20 mph
UV index8 – Very high
Precip chance86%
Sunrise07:03
Sunset19:41
Friday 4/9 Showers
32°25°11.4 mm⌄
Wind13 mph NE
Gusts21 mph
UV index8 – Very high
Precip chance83%
Sunrise07:03
Sunset19:39
Saturday 5/9 Showers
30°26°19.6 mm⌄
Wind10 mph SE
Gusts16 mph
UV index6 – High
Precip chance86%
Sunrise07:04
Sunset19:38
Sunday 6/9 Showers
31°27°3.1 mm⌄
Wind9 mph SE
Gusts13 mph
UV index7 – High
Precip chance67%
Sunrise07:04
Sunset19:37
Monday 7/9 Showers
31°27°1.6 mm⌄
Wind9 mph SE
Gusts13 mph
UV index8 – Very high
Precip chance59%
Sunrise07:05
Sunset19:36
Tuesday 8/9 Thunderstorms
32°26°9.5 mm⌄
Wind11 mph E
Gusts17 mph
UV index7 – High
Precip chance79%
Sunrise07:05
Sunset19:35
Wednesday 9/9 Showers
30°26°2.0 mm⌄
Wind9 mph E
Gusts17 mph
UV index8 – Very high
Precip chance64%
Sunrise07:05
Sunset19:34
Thursday 10/9 Mostly cloudy
31°27°0.3 mm⌄
Wind12 mph E
Gusts17 mph
UV index8 – Very high
Precip chance34%
Sunrise07:06
Sunset19:33
Friday 11/9 Partly cloudy
31°27°0.6 mm⌄
Wind12 mph NE
Gusts16 mph
UV index8 – Very high
Precip chance45%
Sunrise07:06
Sunset19:32
Saturday 12/9 Sunny
31°27°1.5 mm⌄
Wind14 mph NE
Gusts18 mph
UV index8 – Very high
Precip chance57%
Sunrise07:07
Sunset19:31
Sunday 13/9 Sunny
31°27°2.7 mm⌄
Wind14 mph NE
Gusts17 mph
UV index7 – High
Precip chance64%
Sunrise07:07
Sunset19:29
Monday 14/9 Rain (climatological)
29°25°31.0 mm⌄
Day≈26–32°
Night≈22–28°
Precip≈11.8 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 15/9 Partly cloudy (climatological)
33°27°20%⌄
Day≈30–36°
Night≈24–30°
Precip≈11.8 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 16/9 Partly cloudy (climatological)
32°27°20%⌄
Day≈29–35°
Night≈24–30°
Precip≈11.8 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 17/9 Rain (climatological)
29°25°19.0 mm⌄
Day≈26–32°
Night≈22–28°
Precip≈11.8 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Partly cloudy (climatological)
28°25°20%⌄
Day≈25–31°
Night≈22–28°
Precip≈11.8 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Partly cloudy (climatological)
27°24°20%⌄
Day≈24–30°
Night≈21–27°
Precip≈11.8 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Rain (climatological)
27°24°16.0 mm⌄
Day≈24–30°
Night≈21–27°
Precip≈11.8 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Partly cloudy (climatological)
29°25°20%⌄
Day≈26–32°
Night≈22–28°
Precip≈11.8 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 22/9 Partly cloudy (climatological)
30°26°20%⌄
Day≈27–33°
Night≈23–29°
Precip≈11.8 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 23/9 Rain (climatological)
31°27°28.0 mm⌄
Day≈28–34°
Night≈24–30°
Precip≈11.8 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 24/9 Partly cloudy (climatological)
30°26°20%⌄
Day≈27–33°
Night≈23–29°
Precip≈11.8 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 25/9 Partly cloudy (climatological)
28°25°20%⌄
Day≈25–31°
Night≈22–28°
Precip≈11.8 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 26/9 Rain (climatological)
28°24°21.0 mm⌄
Day≈25–31°
Night≈21–27°
Precip≈11.8 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 27/9 Partly cloudy (climatological)
26°23°20%⌄
Day≈23–29°
Night≈20–26°
Precip≈11.8 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 28/9 Partly cloudy (climatological)
28°25°20%⌄
Day≈25–31°
Night≈22–28°
Precip≈11.8 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 29/9 Rain (climatological)
31°26°37.0 mm⌄
Day≈28–34°
Night≈23–29°
Precip≈11.8 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 South Bay, 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.