Big Sky · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
Big Sky & 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
23°
Tue, Sep 8
Coldest night
2°
Thu, Sep 3
Days with precip
3 / 14
of 14 forecast days
Nicest day
Mon, Aug 31
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 5 – Sun 6 Sep
21° 6°
57% precip chance
Sat 12 – Sun 13 Sep
17° 1°
typical range
Sat 19 – Sun 20 Sep
15° 0°
typical range
Sat 26 – Sun 27 Sep
14° 1°
typical range
30 days — Big Sky
14 forecast + 16 climatology
Sun · Today Sunny
15°5°2.9 mm⌄
Wind16 mph W
Gusts29 mph
UV index7 – High
Precip chance57%
Sunrise06:44
Sunset20:07
Mon · Tomorrow Sunny
20°2°1%⌄
Wind7 mph SW
Gusts16 mph
UV index7 – High
Precip chance1%
Sunrise06:46
Sunset20:05
Tuesday 1/9 Sunny
21°5°4%⌄
Wind12 mph S
Gusts23 mph
UV index7 – High
Precip chance4%
Sunrise06:47
Sunset20:03
Wednesday 2/9 Sunny
17°5°5%⌄
Wind18 mph SW
Gusts26 mph
UV index7 – High
Precip chance5%
Sunrise06:48
Sunset20:01
Thursday 3/9 Sunny
18°2°1%⌄
Wind18 mph SW
Gusts39 mph
UV index5 – Moderate
Precip chance1%
Sunrise06:49
Sunset19:59
Friday 4/9 Sunny
21°5°1%⌄
Wind11 mph SW
Gusts18 mph
UV index6 – High
Precip chance1%
Sunrise06:50
Sunset19:58
Saturday 5/9 Mostly cloudy
21°6°8%⌄
Wind11 mph SW
Gusts13 mph
UV index5 – Moderate
Precip chance8%
Sunrise06:52
Sunset19:56
Sunday 6/9 Mostly cloudy
21°7°1.4 mm⌄
Wind15 mph SW
Gusts31 mph
UV index5 – Moderate
Precip chance57%
Sunrise06:53
Sunset19:54
Monday 7/9 Sunny
22°7°3%⌄
Wind13 mph SW
Gusts25 mph
UV index6 – High
Precip chance3%
Sunrise06:54
Sunset19:52
Tuesday 8/9 Mostly cloudy
23°11°8%⌄
Wind15 mph W
Gusts29 mph
UV index6 – High
Precip chance8%
Sunrise06:55
Sunset19:50
Wednesday 9/9 Showers
19°10°2.9 mm⌄
Wind12 mph SW
Gusts30 mph
UV index4 – Moderate
Precip chance78%
Sunrise06:56
Sunset19:48
Thursday 10/9 Fog
18°8°0.6 mm⌄
Wind16 mph S
Gusts31 mph
UV index4 – Moderate
Precip chance49%
Sunrise06:58
Sunset19:46
Friday 11/9 Showers
14°5°0.6 mm⌄
Wind13 mph S
Gusts24 mph
UV index3 – Moderate
Precip chance44%
Sunrise06:59
Sunset19:44
Saturday 12/9 Sunny
17°2°0.2 mm⌄
Wind12 mph SW
Gusts19 mph
UV index5 – Moderate
Precip chance17%
Sunrise07:00
Sunset19:42
Sunday 13/9 Light rain (climatological)
14°1°1.8 mm⌄
Day≈11–17°
Night≈-2–4°
Precip≈0.8 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 14/9 Partly cloudy (climatological)
15°2°20%⌄
Day≈12–18°
Night≈-1–5°
Precip≈0.8 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 15/9 Partly cloudy (climatological)
17°3°20%⌄
Day≈14–20°
Night≈0–6°
Precip≈0.8 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 16/9 Rain (climatological)
14°1°2.3 mm⌄
Day≈11–17°
Night≈-2–4°
Precip≈0.8 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 17/9 Partly cloudy (climatological)
13°1°20%⌄
Day≈10–16°
Night≈-2–4°
Precip≈0.8 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Partly cloudy (climatological)
13°1°20%⌄
Day≈10–16°
Night≈-2–4°
Precip≈0.8 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Light rain (climatological)
12°0°1.6 mm⌄
Day≈9–15°
Night≈-3–3°
Precip≈0.8 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Partly cloudy (climatological)
15°2°20%⌄
Day≈12–18°
Night≈-1–5°
Precip≈0.8 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Partly cloudy (climatological)
16°3°20%⌄
Day≈13–19°
Night≈0–6°
Precip≈0.8 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 22/9 Rain (climatological)
17°3°2.3 mm⌄
Day≈14–20°
Night≈0–6°
Precip≈0.8 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 23/9 Partly cloudy (climatological)
15°2°20%⌄
Day≈12–18°
Night≈-1–5°
Precip≈0.8 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 24/9 Partly cloudy (climatological)
12°0°20%⌄
Day≈9–15°
Night≈-3–3°
Precip≈0.8 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 25/9 Rain (climatological)
12°0°2.2 mm⌄
Day≈9–15°
Night≈-3–3°
Precip≈0.8 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 26/9 Partly cloudy (climatological)
13°1°20%⌄
Day≈10–16°
Night≈-2–4°
Precip≈0.8 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 27/9 Partly cloudy (climatological)
14°1°20%⌄
Day≈11–17°
Night≈-2–4°
Precip≈0.8 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 28/9 Rain (climatological)
16°2°2.1 mm⌄
Day≈13–19°
Night≈-1–5°
Precip≈0.8 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 Big Sky, 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.