Cornwall · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
Cornwall & 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
82°
Mon, Aug 24
Coldest night
45°
Sat, Aug 29
Days with precip
6 / 14
of 14 forecast days
Nicest day
Wed, Aug 26
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 22 – Sun 23 Aug
66° 56°
90% precip chance
Sat 29 – Sun 30 Aug
72° 45°
typical range
Sat 5 – Sun 6 Sep
64° 43°
typical range
Sat 12 – Sun 13 Sep
67° 44°
typical range
30 days — Cornwall
14 forecast + 16 climatology
Sun · Today Sunny
75°51°0.8 mm⌄
Wind8 mph E
Gusts15 mph
UV index4 – Moderate
Precip chance43%
Sunrise06:02
Sunset20:04
Mon · Tomorrow Fog
74°59°0.7 mm⌄
Wind9 mph NW
Gusts11 mph
UV index7 – High
Precip chance57%
Sunrise06:03
Sunset20:02
Tuesday 18/8 Sunny
77°53°7%⌄
Wind6 mph SW
Gusts14 mph
UV index7 – High
Precip chance7%
Sunrise06:04
Sunset20:01
Wednesday 19/8 Sunny
81°58°1.3 mm⌄
Wind13 mph SW
Gusts21 mph
UV index7 – High
Precip chance57%
Sunrise06:05
Sunset19:59
Thursday 20/8 Sunny
77°57°0.3 mm⌄
Wind9 mph W
Gusts13 mph
UV index6 – High
Precip chance26%
Sunrise06:06
Sunset19:57
Friday 21/8 Sunny
73°51°9%⌄
Wind5 mph SE
Gusts10 mph
UV index6 – High
Precip chance9%
Sunrise06:07
Sunset19:56
Saturday 22/8 Showers
63°56°12.0 mm⌄
Wind9 mph NE
Gusts14 mph
UV index4 – Moderate
Precip chance90%
Sunrise06:09
Sunset19:54
Sunday 23/8 Fog
66°59°1.5 mm⌄
Wind8 mph NE
Gusts12 mph
UV index4 – Moderate
Precip chance84%
Sunrise06:10
Sunset19:52
Monday 24/8 Sunny
82°57°13%⌄
Wind12 mph SW
Gusts21 mph
UV index7 – High
Precip chance13%
Sunrise06:11
Sunset19:51
Tuesday 25/8 Sunny
75°59°4.8 mm⌄
Wind11 mph SW
Gusts20 mph
UV index6 – High
Precip chance67%
Sunrise06:12
Sunset19:49
Wednesday 26/8 Partly cloudy
73°56°6%⌄
Wind6 mph NW
Gusts9 mph
UV index6 – High
Precip chance6%
Sunrise06:13
Sunset19:47
Thursday 27/8 Sunny
74°52°1.8 mm⌄
Wind7 mph W
Gusts12 mph
UV index6 – High
Precip chance57%
Sunrise06:15
Sunset19:45
Friday 28/8 Showers
65°47°14.5 mm⌄
Wind11 mph NW
Gusts16 mph
UV index5 – Moderate
Precip chance79%
Sunrise06:16
Sunset19:44
Saturday 29/8 Sunny
71°45°9%⌄
Wind11 mph NW
Gusts16 mph
UV index5 – Moderate
Precip chance9%
Sunrise06:17
Sunset19:42
Sunday 30/8 Rain (climatological)
72°53°7.7 mm⌄
Day≈66–77°
Night≈48–59°
Precip≈3.2 in / August
(climatological)Typical range for these dates · 1991–2020
Monday 31/8 Partly cloudy (climatological)
74°55°20%⌄
Day≈69–80°
Night≈49–60°
Precip≈3.2 in / August
(climatological)Typical range for these dates · 1991–2020
Tuesday 1/9 Partly cloudy (climatological)
70°49°20%⌄
Day≈64–75°
Night≈44–55°
Precip≈3.2 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 2/9 Rain (climatological)
67°48°4.1 mm⌄
Day≈61–72°
Night≈42–53°
Precip≈3.2 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 3/9 Partly cloudy (climatological)
64°46°20%⌄
Day≈59–70°
Night≈41–52°
Precip≈3.2 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 4/9 Partly cloudy (climatological)
62°45°20%⌄
Day≈56–67°
Night≈39–50°
Precip≈3.2 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 5/9 Rain (climatological)
59°43°4.6 mm⌄
Day≈54–65°
Night≈38–49°
Precip≈3.2 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 6/9 Partly cloudy (climatological)
64°46°20%⌄
Day≈59–69°
Night≈41–51°
Precip≈3.2 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 7/9 Partly cloudy (climatological)
67°48°20%⌄
Day≈62–73°
Night≈43–54°
Precip≈3.2 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 8/9 Rain (climatological)
68°49°5.5 mm⌄
Day≈63–73°
Night≈43–54°
Precip≈3.2 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 9/9 Partly cloudy (climatological)
68°48°20%⌄
Day≈62–73°
Night≈43–54°
Precip≈3.2 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 10/9 Partly cloudy (climatological)
62°45°20%⌄
Day≈57–67°
Night≈40–50°
Precip≈3.2 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 11/9 Rain (climatological)
63°45°8.5 mm⌄
Day≈57–68°
Night≈40–51°
Precip≈3.2 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 12/9 Partly cloudy (climatological)
61°44°20%⌄
Day≈55–66°
Night≈39–50°
Precip≈3.2 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 13/9 Partly cloudy (climatological)
67°48°20%⌄
Day≈62–72°
Night≈42–53°
Precip≈3.2 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 14/9 Rain (climatological)
67°48°4.4 mm⌄
Day≈62–72°
Night≈42–53°
Precip≈3.2 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 Cornwall, 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.