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
35°
Tue, Sep 1
Coldest night
9°
Wed, Sep 9
Days with precip
8 / 14
of 14 forecast days
Nicest day
Sun, Sep 6
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 5 – Sun 6 Sep
24° 13°
60% precip chance
Sat 12 – Sun 13 Sep
28° 13°
90% precip chance
Sat 19 – Sun 20 Sep
27° 14°
typical range
Sat 26 – Sun 27 Sep
27° 15°
typical range
30 days — Chester
14 forecast + 16 climatology
Tue · Today Sunny
35°21°13%⌄
Wind11 mph W
Gusts26 mph
UV index8 – Very high
Precip chance13%
Sunrise06:49
Sunset19:55
Wed · Tomorrow Sunny
33°22°11%⌄
Wind9 mph W
Gusts18 mph
UV index8 – High
Precip chance11%
Sunrise06:50
Sunset19:53
Thursday 3/9 Sunny
33°20°10.4 mm⌄
Wind13 mph W
Gusts27 mph
UV index8 – Very high
Precip chance76%
Sunrise06:51
Sunset19:51
Friday 4/9 Showers
28°19°5.1 mm⌄
Wind11 mph NW
Gusts16 mph
UV index7 – High
Precip chance84%
Sunrise06:52
Sunset19:50
Saturday 5/9 Sunny
24°15°2.8 mm⌄
Wind9 mph N
Gusts22 mph
UV index6 – High
Precip chance60%
Sunrise06:53
Sunset19:48
Sunday 6/9 Partly cloudy
24°13°10%⌄
Wind6 mph E
Gusts10 mph
UV index6 – High
Precip chance10%
Sunrise06:54
Sunset19:46
Monday 7/9 Mostly cloudy
27°15°10%⌄
Wind4 mph SW
Gusts15 mph
UV index7 – High
Precip chance10%
Sunrise06:55
Sunset19:45
Tuesday 8/9 Mostly cloudy
20°11°3.1 mm⌄
Wind9 mph NE
Gusts20 mph
UV index4 – Moderate
Precip chance86%
Sunrise06:56
Sunset19:43
Wednesday 9/9 Fog
22°9°0.8 mm⌄
Wind10 mph SE
Gusts32 mph
UV index6 – High
Precip chance58%
Sunrise06:57
Sunset19:41
Thursday 10/9 Showers
29°19°1.8 mm⌄
Wind14 mph SW
Gusts34 mph
UV index7 – High
Precip chance63%
Sunrise06:58
Sunset19:40
Friday 11/9 Fog
27°16°2.2 mm⌄
Wind5 mph N
Gusts14 mph
UV index7 – High
Precip chance69%
Sunrise06:59
Sunset19:38
Saturday 12/9 Showers
28°18°14.2 mm⌄
Wind9 mph SW
Gusts20 mph
UV index6 – High
Precip chance90%
Sunrise07:00
Sunset19:36
Sunday 13/9 Showers
24°13°7.7 mm⌄
Wind7 mph NW
Gusts20 mph
UV index5 – Moderate
Precip chance86%
Sunrise07:01
Sunset19:35
Monday 14/9 Sunny
25°10°7%⌄
Wind7 mph S
Gusts11 mph
UV index6 – High
Precip chance7%
Sunrise07:02
Sunset19:33
Tuesday 15/9 Rain (climatological)
26°15°11.4 mm⌄
Day≈23–29°
Night≈12–18°
Precip≈4.1 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 16/9 Partly cloudy (climatological)
28°16°20%⌄
Day≈25–31°
Night≈13–19°
Precip≈4.1 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 17/9 Partly cloudy (climatological)
29°17°20%⌄
Day≈26–32°
Night≈14–20°
Precip≈4.1 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Rain (climatological)
29°17°6.2 mm⌄
Day≈26–32°
Night≈14–20°
Precip≈4.1 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Partly cloudy (climatological)
27°16°20%⌄
Day≈24–30°
Night≈13–19°
Precip≈4.1 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Partly cloudy (climatological)
24°14°20%⌄
Day≈21–27°
Night≈11–17°
Precip≈4.1 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Rain (climatological)
25°14°10.7 mm⌄
Day≈22–28°
Night≈11–17°
Precip≈4.1 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 22/9 Partly cloudy (climatological)
26°15°20%⌄
Day≈23–29°
Night≈12–18°
Precip≈4.1 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 23/9 Partly cloudy (climatological)
30°17°20%⌄
Day≈27–33°
Night≈14–20°
Precip≈4.1 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 24/9 Rain (climatological)
31°18°12.5 mm⌄
Day≈28–34°
Night≈15–21°
Precip≈4.1 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 25/9 Partly cloudy (climatological)
29°17°20%⌄
Day≈26–32°
Night≈14–20°
Precip≈4.1 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 26/9 Partly cloudy (climatological)
27°16°20%⌄
Day≈24–30°
Night≈13–19°
Precip≈4.1 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 27/9 Rain (climatological)
26°15°12.1 mm⌄
Day≈23–29°
Night≈12–18°
Precip≈4.1 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 28/9 Partly cloudy (climatological)
26°15°20%⌄
Day≈23–29°
Night≈12–18°
Precip≈4.1 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 29/9 Partly cloudy (climatological)
28°16°20%⌄
Day≈25–31°
Night≈13–19°
Precip≈4.1 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 30/9 Rain (climatological)
30°17°7.3 mm⌄
Day≈27–33°
Night≈14–20°
Precip≈4.1 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.