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
94°
Thu, Sep 3
Coldest night
49°
Sat, Sep 12
Days with precip
5 / 14
of 14 forecast days
Nicest day
Sat, Sep 12
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 5 – Sun 6 Sep
75° 57°
90% precip chance
Sat 12 – Sun 13 Sep
77° 49°
5% precip chance
Sat 19 – Sun 20 Sep
83° 62°
typical range
Sat 26 – Sun 27 Sep
86° 62°
typical range
30 days — Chester
14 forecast + 16 climatology
Thu · Today Sunny
94°71°44.5 mm⌄
Wind11 mph NW
Gusts29 mph
UV index7 – High
Precip chance75%
Sunrise06:51
Sunset19:51
Fri · Tomorrow Showers
81°67°94.8 mm⌄
Wind9 mph W
Gusts15 mph
UV index7 – High
Precip chance89%
Sunrise06:52
Sunset19:50
Saturday 5/9 Showers
75°64°11.1 mm⌄
Wind7 mph N
Gusts20 mph
UV index5 – Moderate
Precip chance90%
Sunrise06:53
Sunset19:48
Sunday 6/9 Sunny
75°57°8%⌄
Wind10 mph NE
Gusts23 mph
UV index7 – High
Precip chance8%
Sunrise06:54
Sunset19:46
Monday 7/9 Sunny
76°55°7%⌄
Wind6 mph E
Gusts26 mph
UV index6 – High
Precip chance7%
Sunrise06:55
Sunset19:45
Tuesday 8/9 Mostly cloudy
75°55°16%⌄
Wind4 mph E
Gusts15 mph
UV index5 – Moderate
Precip chance16%
Sunrise06:56
Sunset19:43
Wednesday 9/9 Partly cloudy
85°64°0.6 mm⌄
Wind12 mph W
Gusts24 mph
UV index7 – High
Precip chance41%
Sunrise06:57
Sunset19:41
Thursday 10/9 Mostly cloudy
85°65°0.9 mm⌄
Wind11 mph W
Gusts24 mph
UV index6 – High
Precip chance59%
Sunrise06:58
Sunset19:40
Friday 11/9 Mostly cloudy
70°55°15%⌄
Wind11 mph N
Gusts16 mph
UV index5 – Moderate
Precip chance15%
Sunrise06:59
Sunset19:38
Saturday 12/9 Sunny
69°49°5%⌄
Wind6 mph NE
Gusts13 mph
UV index6 – High
Precip chance5%
Sunrise07:00
Sunset19:36
Sunday 13/9 Sunny
77°51°4%⌄
Wind6 mph S
Gusts13 mph
UV index6 – High
Precip chance4%
Sunrise07:01
Sunset19:35
Monday 14/9 Sunny
84°60°5.2 mm⌄
Wind7 mph SW
Gusts11 mph
UV index7 – High
Precip chance67%
Sunrise07:02
Sunset19:33
Tuesday 15/9 Showers
85°68°5.1 mm⌄
Wind8 mph SW
Gusts24 mph
UV index7 – High
Precip chance80%
Sunrise07:03
Sunset19:31
Wednesday 16/9 Sunny
81°61°11%⌄
Wind8 mph NW
Gusts23 mph
UV index7 – High
Precip chance11%
Sunrise07:04
Sunset19:30
Thursday 17/9 Rain (climatological)
78°59°33.0 mm⌄
Day≈73–83°
Night≈54–65°
Precip≈11.8 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Partly cloudy (climatological)
82°61°20%⌄
Day≈76–87°
Night≈56–67°
Precip≈11.8 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Partly cloudy (climatological)
83°62°20%⌄
Day≈77–88°
Night≈57–68°
Precip≈11.8 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Rain (climatological)
82°62°18.0 mm⌄
Day≈77–88°
Night≈57–67°
Precip≈11.8 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Partly cloudy (climatological)
79°60°20%⌄
Day≈74–85°
Night≈55–65°
Precip≈11.8 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 22/9 Partly cloudy (climatological)
74°57°20%⌄
Day≈69–79°
Night≈51–62°
Precip≈11.8 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 23/9 Rain (climatological)
75°58°31.0 mm⌄
Day≈70–81°
Night≈52–63°
Precip≈11.8 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 24/9 Partly cloudy (climatological)
77°59°20%⌄
Day≈72–82°
Night≈53–64°
Precip≈11.8 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 25/9 Partly cloudy (climatological)
84°63°20%⌄
Day≈79–89°
Night≈58–68°
Precip≈11.8 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 26/9 Rain (climatological)
86°64°36.0 mm⌄
Day≈80–91°
Night≈59–69°
Precip≈11.8 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 27/9 Partly cloudy (climatological)
83°62°20%⌄
Day≈78–89°
Night≈57–68°
Precip≈11.8 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 28/9 Partly cloudy (climatological)
80°60°20%⌄
Day≈74–85°
Night≈55–66°
Precip≈11.8 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 29/9 Rain (climatological)
77°59°35.0 mm⌄
Day≈72–83°
Night≈53–64°
Precip≈11.8 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 30/9 Partly cloudy (climatological)
77°59°20%⌄
Day≈71–82°
Night≈53–64°
Precip≈11.8 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 1/10 Partly cloudy (climatological)
69°50°20%⌄
Day≈63–74°
Night≈44–55°
Precip≈11.8 in / October
(climatological)Typical range for these dates · 1991–2020
Friday 2/10 Rain (climatological)
73°52°21.0 mm⌄
Day≈67–78°
Night≈47–58°
Precip≈11.8 in / October
(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.