Spearfish · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
Spearfish & 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
33°
Mon, Aug 24
Coldest night
12°
Sun, Sep 6
Days with precip
3 / 14
of 14 forecast days
Nicest day
Sat, Sep 5
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 29 – Sun 30 Aug
32° 17°
4% precip chance
Sat 5 – Sun 6 Sep
28° 12°
9% precip chance
Sat 12 – Sun 13 Sep
24° 11°
typical range
Sat 19 – Sun 20 Sep
22° 10°
typical range
30 days — Spearfish
14 forecast + 16 climatology
Mon · Today Sunny
33°20°1%⌄
Wind18 mph NW
Gusts24 mph
UV index8 – High
Precip chance1%
Sunrise06:08
Sunset19:46
Tue · Tomorrow Sunny
30°17°0.9 mm⌄
Wind13 mph N
Gusts22 mph
UV index7 – High
Precip chance36%
Sunrise06:10
Sunset19:44
Wednesday 26/8 Sunny
29°16°3%⌄
Wind11 mph E
Gusts22 mph
UV index8 – High
Precip chance3%
Sunrise06:11
Sunset19:43
Thursday 27/8 Sunny
32°17°0.2 mm⌄
Wind16 mph E
Gusts28 mph
UV index7 – High
Precip chance17%
Sunrise06:12
Sunset19:41
Friday 28/8 Sunny
32°15°5.6 mm⌄
Wind19 mph SE
Gusts30 mph
UV index8 – Very high
Precip chance61%
Sunrise06:13
Sunset19:39
Saturday 29/8 Sunny
32°17°4%⌄
Wind14 mph SE
Gusts21 mph
UV index8 – Very high
Precip chance4%
Sunrise06:14
Sunset19:37
Sunday 30/8 Mostly cloudy
32°17°4%⌄
Wind24 mph NW
Gusts31 mph
UV index8 – Very high
Precip chance4%
Sunrise06:15
Sunset19:36
Monday 31/8 Sunny
30°15°2%⌄
Wind16 mph E
Gusts26 mph
UV index7 – High
Precip chance2%
Sunrise06:17
Sunset19:34
Tuesday 1/9 Mostly cloudy
29°18°2.6 mm⌄
Wind27 mph SE
Gusts33 mph
UV index7 – High
Precip chance57%
Sunrise06:18
Sunset19:32
Wednesday 2/9 Thunderstorms
30°16°0.4 mm⌄
Wind19 mph E
Gusts27 mph
UV index7 – High
Precip chance36%
Sunrise06:19
Sunset19:30
Thursday 3/9 Mostly cloudy
25°17°2.1 mm⌄
Wind11 mph SE
Gusts18 mph
UV index6 – High
Precip chance57%
Sunrise06:20
Sunset19:29
Friday 4/9 Sunny
31°15°1%⌄
Wind13 mph E
Gusts20 mph
UV index8 – Very high
Precip chance1%
Sunrise06:21
Sunset19:27
Saturday 5/9 Mostly cloudy
21°13°9%⌄
Wind13 mph NE
Gusts20 mph
UV index5 – Moderate
Precip chance9%
Sunrise06:22
Sunset19:25
Sunday 6/9 Mostly cloudy
28°12°6%⌄
Wind18 mph N
Gusts28 mph
UV index6 – High
Precip chance6%
Sunrise06:24
Sunset19:23
Monday 7/9 Light rain (climatological)
25°12°1.5 mm⌄
Day≈22–28°
Night≈9–15°
Precip≈1.0 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 8/9 Partly cloudy (climatological)
27°13°20%⌄
Day≈24–30°
Night≈10–16°
Precip≈1.0 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 9/9 Partly cloudy (climatological)
27°13°20%⌄
Day≈24–30°
Night≈10–16°
Precip≈1.0 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 10/9 Rain (climatological)
25°12°2.2 mm⌄
Day≈22–28°
Night≈9–15°
Precip≈1.0 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 11/9 Partly cloudy (climatological)
24°11°20%⌄
Day≈21–27°
Night≈8–14°
Precip≈1.0 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 12/9 Partly cloudy (climatological)
23°11°20%⌄
Day≈20–26°
Night≈8–14°
Precip≈1.0 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 13/9 Rain (climatological)
24°11°2.7 mm⌄
Day≈21–27°
Night≈8–14°
Precip≈1.0 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 14/9 Partly cloudy (climatological)
26°12°20%⌄
Day≈23–29°
Night≈9–15°
Precip≈1.0 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 15/9 Partly cloudy (climatological)
25°12°20%⌄
Day≈22–28°
Night≈9–15°
Precip≈1.0 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 16/9 Light rain (climatological)
28°14°1.6 mm⌄
Day≈25–31°
Night≈11–17°
Precip≈1.0 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 17/9 Partly cloudy (climatological)
25°12°20%⌄
Day≈22–28°
Night≈9–15°
Precip≈1.0 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Partly cloudy (climatological)
24°11°20%⌄
Day≈21–27°
Night≈8–14°
Precip≈1.0 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Rain (climatological)
21°10°3.1 mm⌄
Day≈18–24°
Night≈7–13°
Precip≈1.0 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Partly cloudy (climatological)
22°10°20%⌄
Day≈19–25°
Night≈7–13°
Precip≈1.0 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Partly cloudy (climatological)
24°12°20%⌄
Day≈21–27°
Night≈9–15°
Precip≈1.0 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 22/9 Light rain (climatological)
28°14°1.5 mm⌄
Day≈25–31°
Night≈11–17°
Precip≈1.0 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 Spearfish, 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.