Great Falls · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
Great Falls & 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
95°
Wed, Aug 26
Coldest night
50°
Tue, Sep 1
Days with precip
0 / 14
of 14 forecast days
Nicest day
Sun, Aug 30
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 22 – Sun 23 Aug
95° 65°
42% precip chance
Sat 29 – Sun 30 Aug
87° 55°
4% precip chance
Sat 5 – Sun 6 Sep
81° 52°
typical range
Sat 12 – Sun 13 Sep
79° 51°
typical range
30 days — Great Falls
14 forecast + 16 climatology
Thu · Today Sunny
94°57°1%⌄
Wind12 mph NE
Gusts17 mph
UV index7 – High
Precip chance1%
Sunrise06:28
Sunset20:29
Fri · Tomorrow Mostly cloudy
86°59°6%⌄
Wind14 mph NW
Gusts25 mph
UV index7 – High
Precip chance6%
Sunrise06:29
Sunset20:27
Saturday 22/8 Mostly cloudy
95°66°0.9 mm⌄
Wind20 mph S
Gusts31 mph
UV index7 – High
Precip chance42%
Sunrise06:30
Sunset20:25
Sunday 23/8 Sunny
94°65°4%⌄
Wind26 mph W
Gusts33 mph
UV index7 – High
Precip chance4%
Sunrise06:32
Sunset20:23
Monday 24/8 Mostly cloudy
82°60°4%⌄
Wind12 mph NE
Gusts20 mph
UV index7 – High
Precip chance4%
Sunrise06:33
Sunset20:21
Tuesday 25/8 Sunny
89°62°3%⌄
Wind11 mph NE
Gusts25 mph
UV index8 – Very high
Precip chance3%
Sunrise06:34
Sunset20:19
Wednesday 26/8 Mostly cloudy
95°65°7%⌄
Wind20 mph SW
Gusts30 mph
UV index8 – Very high
Precip chance7%
Sunrise06:36
Sunset20:17
Thursday 27/8 Sunny
89°65°2%⌄
Wind25 mph W
Gusts29 mph
UV index8 – Very high
Precip chance2%
Sunrise06:37
Sunset20:16
Friday 28/8 Sunny
85°58°1%⌄
Wind23 mph W
Gusts32 mph
UV index7 – High
Precip chance1%
Sunrise06:38
Sunset20:14
Saturday 29/8 Sunny
87°58°1%⌄
Wind9 mph E
Gusts21 mph
UV index8 – Very high
Precip chance1%
Sunrise06:40
Sunset20:12
Sunday 30/8 Sunny
74°55°4%⌄
Wind15 mph NW
Gusts24 mph
UV index6 – High
Precip chance4%
Sunrise06:41
Sunset20:10
Monday 31/8 Mostly cloudy
74°52°9%⌄
Wind21 mph W
Gusts34 mph
UV index6 – High
Precip chance9%
Sunrise06:42
Sunset20:08
Tuesday 1/9 Sunny
76°50°3%⌄
Wind15 mph NE
Gusts24 mph
UV index6 – High
Precip chance3%
Sunrise06:44
Sunset20:06
Wednesday 2/9 Sunny
85°53°5%⌄
Wind13 mph NE
Gusts19 mph
UV index7 – High
Precip chance5%
Sunrise06:45
Sunset20:04
Thursday 3/9 Light rain (climatological)
76°50°1.7 mm⌄
Day≈70–81°
Night≈44–55°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 4/9 Partly cloudy (climatological)
81°53°20%⌄
Day≈76–86°
Night≈47–58°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 5/9 Partly cloudy (climatological)
81°53°20%⌄
Day≈75–86°
Night≈47–58°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 6/9 Light rain (climatological)
80°52°1.2 mm⌄
Day≈74–85°
Night≈47–58°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 7/9 Partly cloudy (climatological)
74°49°20%⌄
Day≈69–80°
Night≈44–54°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 8/9 Partly cloudy (climatological)
73°48°20%⌄
Day≈67–78°
Night≈43–53°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 9/9 Light rain (climatological)
71°47°1.9 mm⌄
Day≈65–76°
Night≈41–52°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 10/9 Partly cloudy (climatological)
78°51°20%⌄
Day≈73–83°
Night≈46–56°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 11/9 Partly cloudy (climatological)
79°52°20%⌄
Day≈74–85°
Night≈46–57°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 12/9 Light rain (climatological)
78°51°1.1 mm⌄
Day≈73–83°
Night≈46–56°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 13/9 Partly cloudy (climatological)
79°52°20%⌄
Day≈74–84°
Night≈46–57°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 14/9 Partly cloudy (climatological)
75°49°20%⌄
Day≈69–80°
Night≈44–55°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 15/9 Light rain (climatological)
71°47°0.9 mm⌄
Day≈66–76°
Night≈42–52°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 16/9 Partly cloudy (climatological)
73°48°20%⌄
Day≈67–78°
Night≈43–53°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 17/9 Partly cloudy (climatological)
74°49°20%⌄
Day≈69–79°
Night≈43–54°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Light rain (climatological)
79°52°0.8 mm⌄
Day≈74–84°
Night≈46–57°
Precip≈0.6 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 Great Falls, 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.