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
78°
Sun, Sep 13
Coldest night
32°
Wed, Sep 2
Days with precip
6 / 14
of 14 forecast days
Nicest day
Sat, Sep 5
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 5 – Sun 6 Sep
75° 33°
7% precip chance
Sat 12 – Sun 13 Sep
78° 38°
2% precip chance
Sat 19 – Sun 20 Sep
59° 33°
typical range
Sat 26 – Sun 27 Sep
58° 32°
typical range
30 days — Chester
14 forecast + 16 climatology
Mon · Today Sunny
78°46°1%⌄
Wind12 mph SW
Gusts17 mph
UV index8 – High
Precip chance1%
Sunrise06:31
Sunset19:38
Tue · Tomorrow Mostly cloudy
68°38°6%⌄
Wind12 mph SW
Gusts20 mph
UV index7 – High
Precip chance6%
Sunrise06:32
Sunset19:37
Wednesday 2/9 Sunny
61°32°7%⌄
Wind13 mph SW
Gusts18 mph
UV index8 – High
Precip chance7%
Sunrise06:33
Sunset19:35
Thursday 3/9 Fog
59°34°4.6 mm⌄
Wind10 mph W
Gusts20 mph
UV index8 – Very high
Precip chance86%
Sunrise06:34
Sunset19:34
Friday 4/9 Sunny
63°33°3.4 mm⌄
Wind11 mph SW
Gusts13 mph
UV index5 – Moderate
Precip chance59%
Sunrise06:35
Sunset19:32
Saturday 5/9 Sunny
69°33°2%⌄
Wind11 mph S
Gusts16 mph
UV index6 – High
Precip chance2%
Sunrise06:36
Sunset19:30
Sunday 6/9 Mostly cloudy
75°40°7%⌄
Wind5 mph SE
Gusts15 mph
UV index5 – Moderate
Precip chance7%
Sunrise06:37
Sunset19:29
Monday 7/9 Sunny
74°49°9.1 mm⌄
Wind6 mph S
Gusts15 mph
UV index6 – High
Precip chance81%
Sunrise06:38
Sunset19:27
Tuesday 8/9 Mostly cloudy
64°56°14.4 mm⌄
Wind4 mph NE
Gusts13 mph
UV index4 – Moderate
Precip chance90%
Sunrise06:39
Sunset19:26
Wednesday 9/9 Showers
72°53°1.8 mm⌄
Wind8 mph SW
Gusts11 mph
UV index5 – Moderate
Precip chance69%
Sunrise06:40
Sunset19:24
Thursday 10/9 Sunny
67°48°1.6 mm⌄
Wind11 mph S
Gusts22 mph
UV index5 – Moderate
Precip chance57%
Sunrise06:41
Sunset19:22
Friday 11/9 Sunny
66°41°5%⌄
Wind11 mph S
Gusts20 mph
UV index5 – Moderate
Precip chance5%
Sunrise06:42
Sunset19:21
Saturday 12/9 Sunny
75°38°2%⌄
Wind4 mph NW
Gusts15 mph
UV index6 – High
Precip chance2%
Sunrise06:43
Sunset19:19
Sunday 13/9 Sunny
78°46°1%⌄
Wind9 mph SW
Gusts15 mph
UV index7 – High
Precip chance1%
Sunrise06:43
Sunset19:17
Monday 14/9 Rain (climatological)
62°36°5.3 mm⌄
Day≈57–67°
Night≈30–41°
Precip≈3.0 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 15/9 Partly cloudy (climatological)
67°38°20%⌄
Day≈61–72°
Night≈33–44°
Precip≈3.0 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 16/9 Partly cloudy (climatological)
67°38°20%⌄
Day≈61–72°
Night≈33–44°
Precip≈3.0 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 17/9 Rain (climatological)
64°37°8.4 mm⌄
Day≈58–69°
Night≈31–42°
Precip≈3.0 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Partly cloudy (climatological)
62°35°20%⌄
Day≈56–67°
Night≈30–41°
Precip≈3.0 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Partly cloudy (climatological)
57°33°20%⌄
Day≈52–62°
Night≈27–38°
Precip≈3.0 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Rain (climatological)
59°34°10.1 mm⌄
Day≈53–64°
Night≈28–39°
Precip≈3.0 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Partly cloudy (climatological)
64°37°20%⌄
Day≈58–69°
Night≈31–42°
Precip≈3.0 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 22/9 Partly cloudy (climatological)
64°37°20%⌄
Day≈59–70°
Night≈31–42°
Precip≈3.0 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 23/9 Rain (climatological)
69°40°3.8 mm⌄
Day≈64–74°
Night≈34–45°
Precip≈3.0 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 24/9 Partly cloudy (climatological)
64°37°20%⌄
Day≈58–69°
Night≈31–42°
Precip≈3.0 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 25/9 Partly cloudy (climatological)
62°35°20%⌄
Day≈56–67°
Night≈30–41°
Precip≈3.0 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 26/9 Rain (climatological)
58°33°9.9 mm⌄
Day≈53–64°
Night≈28–39°
Precip≈3.0 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 27/9 Partly cloudy (climatological)
56°32°20%⌄
Day≈50–61°
Night≈26–37°
Precip≈3.0 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 28/9 Partly cloudy (climatological)
60°34°20%⌄
Day≈55–65°
Night≈29–40°
Precip≈3.0 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 29/9 Rain (climatological)
65°37°9.4 mm⌄
Day≈59–70°
Night≈32–43°
Precip≈3.0 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.