Chester · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
Chester & 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
92°
Wed, Sep 2
Coldest night
57°
Wed, Sep 9
Days with precip
9 / 14
of 14 forecast days
Nicest day
Sun, Sep 6
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 29 – Sun 30 Aug
87° 65°
12% precip chance
Sat 5 – Sun 6 Sep
79° 61°
83% precip chance
Sat 12 – Sun 13 Sep
81° 63°
typical range
Sat 19 – Sun 20 Sep
82° 62°
typical range
30 days — Chester
14 forecast + 16 climatology
Thu · Today Mostly cloudy
88°69°1.0 mm⌄
Wind12 mph S
Gusts25 mph
UV index7 – High
Precip chance57%
Sunrise06:24
Sunset19:41
Fri · Tomorrow Mostly cloudy
89°67°0.4 mm⌄
Wind8 mph NW
Gusts16 mph
UV index7 – High
Precip chance36%
Sunrise06:25
Sunset19:39
Saturday 29/8 Mostly cloudy
82°68°12%⌄
Wind8 mph NE
Gusts17 mph
UV index6 – High
Precip chance12%
Sunrise06:26
Sunset19:38
Sunday 30/8 Sunny
87°65°9%⌄
Wind11 mph SW
Gusts25 mph
UV index8 – Very high
Precip chance9%
Sunrise06:27
Sunset19:36
Monday 31/8 Mostly cloudy
90°70°1.1 mm⌄
Wind13 mph NW
Gusts24 mph
UV index8 – Very high
Precip chance61%
Sunrise06:28
Sunset19:34
Tuesday 1/9 Showers
91°71°3.9 mm⌄
Wind8 mph NW
Gusts18 mph
UV index7 – High
Precip chance74%
Sunrise06:29
Sunset19:33
Wednesday 2/9 Sunny
92°72°3.7 mm⌄
Wind8 mph E
Gusts21 mph
UV index8 – Very high
Precip chance72%
Sunrise06:30
Sunset19:31
Thursday 3/9 Showers
88°73°4.2 mm⌄
Wind11 mph NW
Gusts21 mph
UV index8 – Very high
Precip chance76%
Sunrise06:31
Sunset19:30
Friday 4/9 Showers
82°72°15.1 mm⌄
Wind10 mph SE
Gusts17 mph
UV index6 – High
Precip chance90%
Sunrise06:32
Sunset19:28
Saturday 5/9 Mostly cloudy
74°64°11.1 mm⌄
Wind11 mph NE
Gusts21 mph
UV index6 – High
Precip chance83%
Sunrise06:33
Sunset19:27
Sunday 6/9 Sunny
79°61°6%⌄
Wind13 mph E
Gusts22 mph
UV index7 – High
Precip chance6%
Sunrise06:34
Sunset19:25
Monday 7/9 Mostly cloudy
80°60°1.7 mm⌄
Wind9 mph S
Gusts21 mph
UV index7 – High
Precip chance57%
Sunrise06:35
Sunset19:23
Tuesday 8/9 Mostly cloudy
80°63°0.6 mm⌄
Wind9 mph W
Gusts22 mph
UV index7 – High
Precip chance40%
Sunrise06:36
Sunset19:22
Wednesday 9/9 Showers
69°57°21.1 mm⌄
Wind15 mph W
Gusts32 mph
UV index4 – Moderate
Precip chance91%
Sunrise06:36
Sunset19:20
Thursday 10/9 Rain (climatological)
77°61°14.4 mm⌄
Day≈72–82°
Night≈55–66°
Precip≈5.5 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 11/9 Partly cloudy (climatological)
81°63°20%⌄
Day≈76–86°
Night≈58–68°
Precip≈5.5 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 12/9 Partly cloudy (climatological)
81°63°20%⌄
Day≈76–87°
Night≈58–69°
Precip≈5.5 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 13/9 Rain (climatological)
81°63°7.0 mm⌄
Day≈75–86°
Night≈57–68°
Precip≈5.5 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 14/9 Partly cloudy (climatological)
77°61°20%⌄
Day≈72–83°
Night≈55–66°
Precip≈5.5 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 15/9 Partly cloudy (climatological)
73°58°20%⌄
Day≈67–78°
Night≈53–63°
Precip≈5.5 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 16/9 Rain (climatological)
71°57°7.9 mm⌄
Day≈66–77°
Night≈52–63°
Precip≈5.5 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 17/9 Partly cloudy (climatological)
78°61°20%⌄
Day≈73–83°
Night≈56–67°
Precip≈5.5 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Partly cloudy (climatological)
80°63°20%⌄
Day≈75–86°
Night≈57–68°
Precip≈5.5 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Rain (climatological)
82°64°15.3 mm⌄
Day≈77–88°
Night≈58–69°
Precip≈5.5 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Partly cloudy (climatological)
79°62°20%⌄
Day≈73–84°
Night≈56–67°
Precip≈5.5 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Partly cloudy (climatological)
74°59°20%⌄
Day≈69–80°
Night≈54–64°
Precip≈5.5 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 22/9 Rain (climatological)
71°57°12.0 mm⌄
Day≈66–77°
Night≈52–62°
Precip≈5.5 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 23/9 Partly cloudy (climatological)
75°60°20%⌄
Day≈70–81°
Night≈54–65°
Precip≈5.5 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 24/9 Partly cloudy (climatological)
76°60°20%⌄
Day≈71–82°
Night≈55–65°
Precip≈5.5 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 25/9 Rain (climatological)
80°62°10.7 mm⌄
Day≈74–85°
Night≈57–68°
Precip≈5.5 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 Chester, 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.