Cape Horn · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
Cape Horn & 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
30°
Tue, Sep 8
Coldest night
8°
Thu, Sep 3
Days with precip
6 / 14
of 14 forecast days
Nicest day
Mon, Sep 7
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 29 – Sun 30 Aug
20° 10°
77% precip chance
Sat 5 – Sun 6 Sep
19° 8°
64% precip chance
Sat 12 – Sun 13 Sep
14° 6°
typical range
Sat 19 – Sun 20 Sep
14° 5°
typical range
30 days — Cape Horn
14 forecast + 16 climatology
Wed · Today Sunny
28°16°7%⌄
Wind7 mph S
Gusts19 mph
UV index6 – Moderate
Precip chance7%
Sunrise06:19
Sunset20:07
Thu · Tomorrow Mostly cloudy
22°15°1.0 mm⌄
Wind6 mph SW
Gusts14 mph
UV index4 – Moderate
Precip chance56%
Sunrise06:20
Sunset20:05
Friday 28/8 Showers
21°14°0.9 mm⌄
Wind8 mph SW
Gusts15 mph
UV index6 – High
Precip chance48%
Sunrise06:21
Sunset20:03
Saturday 29/8 Showers
20°12°3.9 mm⌄
Wind6 mph S
Gusts17 mph
UV index6 – High
Precip chance77%
Sunrise06:23
Sunset20:00
Sunday 30/8 Showers
17°10°0.5 mm⌄
Wind3 mph SE
Gusts14 mph
UV index4 – Moderate
Precip chance47%
Sunrise06:24
Sunset19:58
Monday 31/8 Mostly cloudy
13°11°2.3 mm⌄
Wind3 mph NE
Gusts14 mph
UV index3 – Moderate
Precip chance82%
Sunrise06:26
Sunset19:56
Tuesday 1/9 Showers
16°11°6.3 mm⌄
Wind4 mph E
Gusts12 mph
UV index4 – Moderate
Precip chance91%
Sunrise06:27
Sunset19:54
Wednesday 2/9 Showers
15°11°23.8 mm⌄
Wind8 mph S
Gusts18 mph
UV index3 – Moderate
Precip chance93%
Sunrise06:29
Sunset19:52
Thursday 3/9 Showers
15°8°24.0 mm⌄
Wind6 mph N
Gusts11 mph
UV index4 – Moderate
Precip chance88%
Sunrise06:30
Sunset19:50
Friday 4/9 Mostly cloudy
17°8°0.6 mm⌄
Wind4 mph S
Gusts14 mph
UV index4 – Moderate
Precip chance52%
Sunrise06:32
Sunset19:48
Saturday 5/9 Mostly cloudy
18°10°1.8 mm⌄
Wind4 mph SW
Gusts14 mph
UV index4 – Moderate
Precip chance64%
Sunrise06:33
Sunset19:46
Sunday 6/9 Mostly cloudy
19°8°13%⌄
Wind5 mph SW
Gusts15 mph
UV index4 – Moderate
Precip chance13%
Sunrise06:34
Sunset19:44
Monday 7/9 Mostly cloudy
21°10°15%⌄
Wind4 mph NE
Gusts15 mph
UV index6 – High
Precip chance15%
Sunrise06:36
Sunset19:42
Tuesday 8/9 Sunny
30°16°2%⌄
Wind5 mph SW
Gusts16 mph
UV index8 – Very high
Precip chance2%
Sunrise06:37
Sunset19:40
Wednesday 9/9 Rain (climatological)
14°6°9.9 mm⌄
Day≈11–17°
Night≈3–9°
Precip≈5.6 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 10/9 Partly cloudy (climatological)
17°8°20%⌄
Day≈14–20°
Night≈5–11°
Precip≈5.6 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 11/9 Partly cloudy (climatological)
17°8°20%⌄
Day≈14–20°
Night≈5–11°
Precip≈5.6 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 12/9 Rain (climatological)
14°6°10.3 mm⌄
Day≈11–17°
Night≈3–9°
Precip≈5.6 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 13/9 Partly cloudy (climatological)
14°6°20%⌄
Day≈11–17°
Night≈3–9°
Precip≈5.6 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 14/9 Partly cloudy (climatological)
10°4°20%⌄
Day≈7–13°
Night≈1–7°
Precip≈5.6 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 15/9 Rain (climatological)
10°4°14.1 mm⌄
Day≈7–13°
Night≈1–7°
Precip≈5.6 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 16/9 Partly cloudy (climatological)
15°7°20%⌄
Day≈12–18°
Night≈4–10°
Precip≈5.6 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 17/9 Partly cloudy (climatological)
15°7°20%⌄
Day≈12–18°
Night≈4–10°
Precip≈5.6 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Rain (climatological)
17°8°12.2 mm⌄
Day≈14–20°
Night≈5–11°
Precip≈5.6 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Partly cloudy (climatological)
14°7°20%⌄
Day≈11–17°
Night≈4–10°
Precip≈5.6 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Partly cloudy (climatological)
11°5°20%⌄
Day≈8–14°
Night≈2–8°
Precip≈5.6 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Rain (climatological)
10°4°10.8 mm⌄
Day≈7–13°
Night≈1–7°
Precip≈5.6 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 22/9 Partly cloudy (climatological)
12°5°20%⌄
Day≈9–15°
Night≈2–8°
Precip≈5.6 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 23/9 Partly cloudy (climatological)
15°7°20%⌄
Day≈12–18°
Night≈4–10°
Precip≈5.6 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 24/9 Rain (climatological)
15°7°8.9 mm⌄
Day≈12–18°
Night≈4–10°
Precip≈5.6 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 Cape Horn, 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.