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
84°
Tue, Aug 25
Coldest night
31°
Sun, Sep 6
Days with precip
0 / 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
82° 41°
1% precip chance
Sat 5 – Sun 6 Sep
71° 31°
1% precip chance
Sat 12 – Sun 13 Sep
70° 33°
typical range
Sat 19 – Sun 20 Sep
71° 34°
typical range
30 days — Chester
14 forecast + 16 climatology
Tue · Today Mostly cloudy
84°53°8%⌄
Wind11 mph SW
Gusts20 mph
UV index8 – Very high
Precip chance8%
Sunrise06:25
Sunset19:48
Wed · Tomorrow Mostly cloudy
84°47°6%⌄
Wind12 mph SW
Gusts21 mph
UV index9 – Very high
Precip chance6%
Sunrise06:26
Sunset19:46
Thursday 27/8 Mostly cloudy
83°45°5%⌄
Wind12 mph SW
Gusts18 mph
UV index9 – Very high
Precip chance5%
Sunrise06:27
Sunset19:45
Friday 28/8 Sunny
81°44°2%⌄
Wind14 mph SW
Gusts21 mph
UV index7 – High
Precip chance2%
Sunrise06:28
Sunset19:43
Saturday 29/8 Sunny
82°41°1%⌄
Wind12 mph SW
Gusts14 mph
UV index7 – High
Precip chance1%
Sunrise06:29
Sunset19:42
Sunday 30/8 Sunny
80°43°1%⌄
Wind11 mph SW
Gusts16 mph
UV index7 – High
Precip chance1%
Sunrise06:30
Sunset19:40
Monday 31/8 Sunny
77°42°1%⌄
Wind12 mph S
Gusts22 mph
UV index6 – High
Precip chance1%
Sunrise06:31
Sunset19:38
Tuesday 1/9 Sunny
73°37°2%⌄
Wind14 mph SW
Gusts28 mph
UV index6 – High
Precip chance2%
Sunrise06:32
Sunset19:37
Wednesday 2/9 Mostly cloudy
77°38°8%⌄
Wind6 mph SE
Gusts15 mph
UV index6 – High
Precip chance8%
Sunrise06:33
Sunset19:35
Thursday 3/9 Mostly cloudy
83°49°9%⌄
Wind12 mph SW
Gusts15 mph
UV index6 – High
Precip chance9%
Sunrise06:34
Sunset19:34
Friday 4/9 Mostly cloudy
76°47°5%⌄
Wind13 mph SW
Gusts21 mph
UV index6 – High
Precip chance5%
Sunrise06:35
Sunset19:32
Saturday 5/9 Sunny
64°37°1%⌄
Wind10 mph N
Gusts16 mph
UV index5 – Moderate
Precip chance1%
Sunrise06:36
Sunset19:30
Sunday 6/9 Sunny
71°31°1%⌄
Wind11 mph NE
Gusts17 mph
UV index6 – High
Precip chance1%
Sunrise06:37
Sunset19:29
Monday 7/9 Sunny
83°39°0%⌄
Wind6 mph SW
Gusts15 mph
UV index7 – High
Precip chance0%
Sunrise06:38
Sunset19:27
Tuesday 8/9 Light rain (climatological)
71°36°1.1 mm⌄
Day≈65–76°
Night≈31–41°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 9/9 Partly cloudy (climatological)
75°39°20%⌄
Day≈70–81°
Night≈33–44°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 10/9 Partly cloudy (climatological)
76°39°20%⌄
Day≈70–81°
Night≈33–44°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 11/9 Light rain (climatological)
72°37°1.7 mm⌄
Day≈67–78°
Night≈31–42°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 12/9 Partly cloudy (climatological)
70°36°20%⌄
Day≈65–76°
Night≈30–41°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 13/9 Partly cloudy (climatological)
66°33°20%⌄
Day≈60–71°
Night≈28–38°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 14/9 Light rain (climatological)
67°34°2.0 mm⌄
Day≈62–73°
Night≈29–39°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 15/9 Partly cloudy (climatological)
73°37°20%⌄
Day≈67–78°
Night≈32–42°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 16/9 Partly cloudy (climatological)
73°37°20%⌄
Day≈68–78°
Night≈32–43°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 17/9 Light rain (climatological)
78°40°0.8 mm⌄
Day≈72–83°
Night≈35–46°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Partly cloudy (climatological)
72°37°20%⌄
Day≈67–78°
Night≈31–42°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Partly cloudy (climatological)
71°36°20%⌄
Day≈65–76°
Night≈30–41°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Light rain (climatological)
67°34°2.0 mm⌄
Day≈62–73°
Night≈28–39°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Partly cloudy (climatological)
65°32°20%⌄
Day≈59–70°
Night≈27–38°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 22/9 Partly cloudy (climatological)
69°35°20%⌄
Day≈63–74°
Night≈29–40°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 23/9 Light rain (climatological)
74°38°1.9 mm⌄
Day≈68–79°
Night≈32–43°
Precip≈0.6 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.