Charlestown · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
Charlestown & 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
40°
Fri, Sep 4
Coldest night
9°
Tue, Sep 15
Days with precip
5 / 14
of 14 forecast days
Nicest day
Mon, Sep 14
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 5 – Sun 6 Sep
37° 18°
57% precip chance
Sat 12 – Sun 13 Sep
31° 15°
90% precip chance
Sat 19 – Sun 20 Sep
33° 19°
typical range
Sat 26 – Sun 27 Sep
33° 19°
typical range
30 days — Charlestown
14 forecast + 16 climatology
Fri · Today Sunny
40°24°1.6 mm⌄
Wind13 mph NW
Gusts23 mph
UV index8 – Very high
Precip chance57%
Sunrise07:14
Sunset20:08
Sat · Tomorrow Showers
37°22°1.8 mm⌄
Wind16 mph W
Gusts31 mph
UV index7 – High
Precip chance57%
Sunrise07:15
Sunset20:07
Sunday 6/9 Sunny
31°18°0.2 mm⌄
Wind12 mph NE
Gusts27 mph
UV index7 – High
Precip chance17%
Sunrise07:16
Sunset20:05
Monday 7/9 Sunny
31°15°6%⌄
Wind9 mph NE
Gusts26 mph
UV index8 – Very high
Precip chance6%
Sunrise07:17
Sunset20:04
Tuesday 8/9 Mostly cloudy
33°20°8%⌄
Wind15 mph S
Gusts29 mph
UV index8 – Very high
Precip chance8%
Sunrise07:18
Sunset20:02
Wednesday 9/9 Sunny
35°23°4%⌄
Wind16 mph SW
Gusts32 mph
UV index9 – Very high
Precip chance4%
Sunrise07:19
Sunset20:00
Thursday 10/9 Mostly cloudy
30°18°8%⌄
Wind12 mph N
Gusts18 mph
UV index7 – High
Precip chance8%
Sunrise07:20
Sunset19:59
Friday 11/9 Mostly cloudy
19°15°5.7 mm⌄
Wind8 mph E
Gusts14 mph
UV index4 – Moderate
Precip chance86%
Sunrise07:20
Sunset19:57
Saturday 12/9 Showers
20°15°5.2 mm⌄
Wind6 mph SE
Gusts11 mph
UV index5 – Moderate
Precip chance90%
Sunrise07:21
Sunset19:56
Sunday 13/9 Fog
31°19°1.2 mm⌄
Wind8 mph SW
Gusts21 mph
UV index8 – Very high
Precip chance69%
Sunrise07:22
Sunset19:54
Monday 14/9 Sunny
22°12°7%⌄
Wind12 mph N
Gusts23 mph
UV index6 – High
Precip chance7%
Sunrise07:23
Sunset19:53
Tuesday 15/9 Sunny
25°9°3%⌄
Wind8 mph E
Gusts15 mph
UV index6 – High
Precip chance3%
Sunrise07:24
Sunset19:51
Wednesday 16/9 Sunny
36°17°17%⌄
Wind10 mph SW
Gusts28 mph
UV index9 – Very high
Precip chance17%
Sunrise07:25
Sunset19:49
Thursday 17/9 Sunny
37°25°3%⌄
Wind7 mph S
Gusts19 mph
UV index9 – Very high
Precip chance3%
Sunrise07:26
Sunset19:48
Friday 18/9 Light rain (climatological)
30°18°1.7 mm⌄
Day≈27–33°
Night≈15–21°
Precip≈1.3 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Partly cloudy (climatological)
33°19°20%⌄
Day≈30–36°
Night≈16–22°
Precip≈1.3 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Partly cloudy (climatological)
32°19°20%⌄
Day≈29–35°
Night≈16–22°
Precip≈1.3 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Rain (climatological)
30°18°4.2 mm⌄
Day≈27–33°
Night≈15–21°
Precip≈1.3 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 22/9 Partly cloudy (climatological)
30°18°20%⌄
Day≈27–33°
Night≈15–21°
Precip≈1.3 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 23/9 Partly cloudy (climatological)
28°16°20%⌄
Day≈25–31°
Night≈13–19°
Precip≈1.3 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 24/9 Rain (climatological)
27°16°2.7 mm⌄
Day≈24–30°
Night≈13–19°
Precip≈1.3 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 25/9 Partly cloudy (climatological)
30°18°20%⌄
Day≈27–33°
Night≈15–21°
Precip≈1.3 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 26/9 Partly cloudy (climatological)
33°19°20%⌄
Day≈30–36°
Night≈16–22°
Precip≈1.3 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 27/9 Rain (climatological)
33°20°3.4 mm⌄
Day≈30–36°
Night≈17–23°
Precip≈1.3 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 28/9 Partly cloudy (climatological)
31°18°20%⌄
Day≈28–34°
Night≈15–21°
Precip≈1.3 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 29/9 Partly cloudy (climatological)
30°17°20%⌄
Day≈27–33°
Night≈14–20°
Precip≈1.3 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 30/9 Rain (climatological)
29°17°3.1 mm⌄
Day≈26–32°
Night≈14–20°
Precip≈1.3 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 1/10 Partly cloudy (climatological)
23°12°20%⌄
Day≈20–26°
Night≈9–15°
Precip≈1.3 in / October
(climatological)Typical range for these dates · 1991–2020
Friday 2/10 Partly cloudy (climatological)
24°12°20%⌄
Day≈21–27°
Night≈9–15°
Precip≈1.3 in / October
(climatological)Typical range for these dates · 1991–2020
Saturday 3/10 Rain (climatological)
28°14°2.8 mm⌄
Day≈25–31°
Night≈11–17°
Precip≈1.3 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 Charlestown, 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.