Sun Valley · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
Sun Valley & 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
77°
Mon, Aug 31
Coldest night
51°
Thu, Sep 3
Days with precip
6 / 14
of 14 forecast days
Nicest day
Thu, Sep 3
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 29 – Sun 30 Aug
75° 56°
16% precip chance
Sat 5 – Sun 6 Sep
71° 58°
60% precip chance
Sat 12 – Sun 13 Sep
62° 50°
typical range
Sat 19 – Sun 20 Sep
61° 48°
typical range
30 days — Sun Valley
14 forecast + 16 climatology
Tue · Today Sunny
70°56°0.2 mm⌄
Wind9 mph NW
Gusts21 mph
UV index7 – High
Precip chance18%
Sunrise06:21
Sunset19:46
Wed · Tomorrow Mostly cloudy
73°56°14%⌄
Wind8 mph SW
Gusts18 mph
UV index8 – High
Precip chance14%
Sunrise06:22
Sunset19:44
Thursday 27/8 Showers
73°60°20.8 mm⌄
Wind13 mph S
Gusts23 mph
UV index6 – High
Precip chance92%
Sunrise06:23
Sunset19:43
Friday 28/8 Fog
76°64°1.8 mm⌄
Wind8 mph N
Gusts23 mph
UV index6 – High
Precip chance70%
Sunrise06:24
Sunset19:41
Saturday 29/8 Sunny
73°56°5%⌄
Wind8 mph N
Gusts24 mph
UV index6 – High
Precip chance5%
Sunrise06:25
Sunset19:39
Sunday 30/8 Mostly cloudy
75°62°16%⌄
Wind11 mph SW
Gusts21 mph
UV index5 – Moderate
Precip chance16%
Sunrise06:26
Sunset19:38
Monday 31/8 Showers
77°68°2.6 mm⌄
Wind12 mph W
Gusts26 mph
UV index7 – High
Precip chance81%
Sunrise06:27
Sunset19:36
Tuesday 1/9 Partly cloudy
73°58°10%⌄
Wind10 mph NW
Gusts20 mph
UV index6 – High
Precip chance10%
Sunrise06:28
Sunset19:35
Wednesday 2/9 Mostly cloudy
66°56°1.2 mm⌄
Wind6 mph N
Gusts18 mph
UV index4 – Moderate
Precip chance62%
Sunrise06:29
Sunset19:33
Thursday 3/9 Sunny
73°51°8%⌄
Wind4 mph N
Gusts7 mph
UV index6 – High
Precip chance8%
Sunrise06:30
Sunset19:31
Friday 4/9 Fog
66°60°3.3 mm⌄
Wind5 mph NE
Gusts10 mph
UV index4 – Moderate
Precip chance87%
Sunrise06:31
Sunset19:30
Saturday 5/9 Fog
66°58°0.4 mm⌄
Wind5 mph E
Gusts13 mph
UV index4 – Moderate
Precip chance60%
Sunrise06:32
Sunset19:28
Sunday 6/9 Sunny
71°58°9%⌄
Wind8 mph SE
Gusts12 mph
UV index6 – High
Precip chance9%
Sunrise06:33
Sunset19:26
Monday 7/9 Sunny
70°56°12%⌄
Wind10 mph S
Gusts17 mph
UV index6 – High
Precip chance12%
Sunrise06:34
Sunset19:25
Tuesday 8/9 Rain (climatological)
65°52°4.6 mm⌄
Day≈59–70°
Night≈47–58°
Precip≈2.6 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 9/9 Partly cloudy (climatological)
69°55°20%⌄
Day≈64–75°
Night≈50–60°
Precip≈2.6 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 10/9 Partly cloudy (climatological)
66°53°20%⌄
Day≈60–71°
Night≈47–58°
Precip≈2.6 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 11/9 Rain (climatological)
67°54°5.1 mm⌄
Day≈62–73°
Night≈48–59°
Precip≈2.6 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 12/9 Partly cloudy (climatological)
62°50°20%⌄
Day≈56–67°
Night≈45–56°
Precip≈2.6 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 13/9 Partly cloudy (climatological)
61°50°20%⌄
Day≈56–67°
Night≈45–55°
Precip≈2.6 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 14/9 Rain (climatological)
60°49°4.0 mm⌄
Day≈54–65°
Night≈44–55°
Precip≈2.6 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 15/9 Partly cloudy (climatological)
66°53°20%⌄
Day≈60–71°
Night≈47–58°
Precip≈2.6 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 16/9 Partly cloudy (climatological)
66°53°20%⌄
Day≈60–71°
Night≈47–58°
Precip≈2.6 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 17/9 Rain (climatological)
70°56°8.1 mm⌄
Day≈65–76°
Night≈50–61°
Precip≈2.6 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Partly cloudy (climatological)
65°53°20%⌄
Day≈60–71°
Night≈47–58°
Precip≈2.6 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Partly cloudy (climatological)
61°50°20%⌄
Day≈56–67°
Night≈45–55°
Precip≈2.6 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Rain (climatological)
57°48°4.2 mm⌄
Day≈52–63°
Night≈42–53°
Precip≈2.6 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Partly cloudy (climatological)
62°51°20%⌄
Day≈56–67°
Night≈45–56°
Precip≈2.6 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 22/9 Partly cloudy (climatological)
65°53°20%⌄
Day≈60–71°
Night≈47–58°
Precip≈2.6 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 23/9 Rain (climatological)
66°53°7.7 mm⌄
Day≈61–72°
Night≈48–58°
Precip≈2.6 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 Sun Valley, 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.