Special Weather Statement
Ends in 8 min
When
Until 10:00 AM
Where
Missouri Headwaters; Gallatin Valley
Issued for this forecast zone · National Weather Service Great Falls MT
Full alert textHide details
Patchy dense fog has developed this morning along the Missouri Headwaters and into the Gallatin Valley. Visibility dropping to below a half mile will be possible through the mid morning.
Those traveling, especially on I-90 between Belgrade and Three Forks should be alert in rapid reductions in visibility.
Reminder, slow down and use low beam headlights when driving through fog.
Areas: Missouri Headwaters; Gallatin Valley
See it on weather.gov (opens in a new tab)

Observed 9:35 AM MDT at KBZN

Gallatin Gateway, MT weather

Foggy and 27°−3°, 11°6° colder than a typical Oct 24, freeze watch tonight, low 25°−4°.

Mostly agree

Now 27°−3°

Fog

Wind: Calm; Light through 9 PM
Visibility (notable): 0.2 mi0.3 km; Dense fog
Dew point: 27°−3°; Dry, static shocks likely
Humidity: 100%; Air 27°−3°, dew point 27°−3° · frost likely
UV index: 1Low; Moderate 11 AM–4 PM · peak 4
Pressure: 30.39 inHg1029 hPa; Falling · −0.06 inHg−2.0 hPa in 3 h

Light snow now, through the next 2 hours.

From forecast models

Next 48 hours

25°14° cooler than this time yesterday (51°11° then, 26°−3° now)

Good hours for

Hard freeze until 11 AM (low 26°−3°)
Fog until 10 AM
Above 30°−1° today by 10 AM
Hard freeze tonight 8 PM–11 AM (low 23°−5°)
Hard freeze tomorrow night from 8 PM (low 24°−4°)

This morningUp to 36°2° by 11 AM · freezing, low 26°−3° · Partly cloudy
This afternoonUp to 41°5° by 2 PM · Clear
TonightDown to 25°−4° by 3 AM · freezing, low 25°−4° · Clear
Tomorrow morningUp to 33°1° by 11 AM · freezing, low 23°−5° · Clear
Tomorrow afternoonUp to 41°5° by 4 PM · Clear
Tomorrow nightDown to 24°−4° by 4 AM · freezing, low 24°−4° · Partly cloudy
Monday morningNear 24°−4° · freezing, low 24°−4° · Clear

Hourly forecast, next 48 hours, in the place's local time
Hour	Conditions	Temperature	Feels like	Precipitation	Wind	Humidity	Cloud cover	UV index
Sat 9a	Fog	26°−3° (likely 22°−6° to 29°−2°)	22°−6°	0%	3 mph5 km/h from S, gusts 3 mph5 km/h	95%	42%	0
Sat 10a	Sunny	32°0° (likely 24°−4° to 32°0°)	32°0°	0%	2 mph3 km/h from ENE, gusts 3 mph5 km/h	88%	41%	1
Sat 11a	Sunny	36°2° (likely 26°−3° to 36°2°)	36°2°	0%	1 mph2 km/h from NNE, gusts 3 mph5 km/h	84%	28%	3
Sat 12p	Sunny	37°3° (likely 31°−1° to 38°3°)	37°3°	0%	1 mph2 km/h from N, gusts 4 mph7 km/h	83%	14%	4
Sat 1p	Sunny	38°3° (likely 34°1° to 40°4°)	38°3°	0%	1 mph2 km/h from NNE, gusts 4 mph7 km/h	83%	11%	4
Sat 2p	Sunny	41°5° (likely 36°2° to 41°5°)	41°5°	0%	1 mph2 km/h from NNE, gusts 5 mph9 km/h	78%	11%	4
Sat 3p	Sunny	40°4° (likely 38°3° to 42°6°)	40°4°	0%	0 mph0 km/h, gusts 4 mph7 km/h	75%	10%	3
Sat 4p	Sunny	40°4° (likely 40°4° to 42°6°)	40°4°	0%	0 mph0 km/h, gusts 5 mph8 km/h	73%	7%	2
Sat 5p	Sunny	41°5° (likely 39°4° to 42°6°)	41°5°	0%	0 mph0 km/h, gusts 4 mph7 km/h	74%	6%	1
Sat 6p	Clear	38°3° (likely 37°3° to 40°4°)	38°3°	0%	0 mph0 km/h, gusts 3 mph5 km/h	77%	7%	0
Sat 7p	Clear	34°1° (likely 32°0° to 37°3°)	34°1°	0%	0 mph0 km/h, gusts 4 mph6 km/h	94%	2%	0
Sat 8p	Clear	32°0° (likely 32°0° to 36°2°)	32°0°	0%	1 mph2 km/h from SSW, gusts 3 mph5 km/h	97%	1%	0
Sat 9p	Clear	30°−1° (likely 30°−1° to 36°2°)	30°−1°	0%	2 mph3 km/h from SSW, gusts 4 mph6 km/h	95%	0%	0
Sat 10p	Clear	29°−2° (likely 29°−2° to 35°2°)	29°−2°	0%	2 mph3 km/h from S, gusts 3 mph5 km/h	92%	0%	0
Sat 11p	Clear	29°−2° (likely 29°−2° to 35°2°)	29°−2°	0%	2 mph3 km/h from S, gusts 2 mph4 km/h	90%	0%	0
Sun 12a	Clear	28°−2° (likely 28°−2° to 35°2°)	28°−2°	0%	2 mph3 km/h from S, gusts 3 mph5 km/h	91%	0%	0
Sun 1a	Clear	27°−3° (likely 27°−3° to 34°1°)	27°−3°	0%	2 mph3 km/h from S, gusts 3 mph5 km/h	94%	0%	0
Sun 2a	Clear	26°−3° (likely 26°−3° to 34°1°)	26°−3°	0%	1 mph2 km/h from SSW, gusts 3 mph5 km/h	96%	0%	0
Sun 3a	Clear	25°−4° (likely 25°−4° to 34°1°)	25°−4°	0%	1 mph2 km/h from S, gusts 3 mph5 km/h	97%	0%	0
Sun 4a	Clear	25°−4° (likely 25°−4° to 34°1°)	25°−4°	0%	1 mph2 km/h from S, gusts 4 mph6 km/h	97%	0%	0
Sun 5a	Clear	25°−4° (likely 25°−4° to 34°1°)	25°−4°	0%	0 mph0 km/h, gusts 3 mph5 km/h	96%	0%	0
Sun 6a	Clear	24°−4° (likely 24°−4° to 33°1°)	24°−4°	0%	0 mph0 km/h, gusts 3 mph4 km/h	97%	0%	0
Sun 7a	Clear	24°−4° (likely 24°−4° to 33°1°)	24°−4°	0%	0 mph0 km/h, gusts 3 mph4 km/h	99%	0%	0
Sun 8a	Sunny	23°−5° (likely 23°−5° to 33°1°)	23°−5°	0%	0 mph0 km/h, gusts 3 mph5 km/h	100%	0%	0
Sun 9a	Sunny	25°−4° (likely 25°−4° to 34°1°)	25°−4°	0%	1 mph2 km/h from N, gusts 4 mph6 km/h	99%	0%	0
Sun 10a	Sunny	30°−1° (likely 30°−1° to 38°3°)	30°−1°	0%	1 mph2 km/h from N, gusts 3 mph4 km/h	92%	1%	1
Sun 11a	Sunny	33°1° (likely 33°1° to 41°5°)	33°1°	0%	1 mph2 km/h from N, gusts 3 mph6 km/h	89%	0%	2
Sun 12p	Sunny	35°2° (likely 35°2° to 44°7°)	32°0°	0%	3 mph5 km/h from N, gusts 6 mph9 km/h	87%	0%	3
Sun 1p	Sunny	38°3° (likely 38°3° to 47°8°)	36°2°	0%	3 mph5 km/h from N, gusts 7 mph12 km/h	86%	0%	3
Sun 2p	Sunny	39°4° (likely 39°4° to 50°10°)	37°3°	0%	3 mph5 km/h from N, gusts 11 mph17 km/h	83%	0%	4
Sun 3p	Sunny	40°4° (likely 40°4° to 50°10°)	38°3°	0%	3 mph5 km/h from NNE, gusts 13 mph21 km/h	81%	0%	3
Sun 4p	Sunny	41°5° (likely 41°5° to 50°10°)	39°4°	0%	3 mph5 km/h from NNE, gusts 15 mph23 km/h	79%	1%	3
Sun 5p	Sunny	40°4° (likely 40°4° to 48°9°)	38°3°	0%	3 mph5 km/h from NNE, gusts 16 mph25 km/h	79%	2%	2
Sun 6p	Clear	38°3° (likely 37°3° to 44°7°)	38°3°	0%	1 mph2 km/h from E, gusts 15 mph24 km/h	80%	5%	1
Sun 7p	Clear	34°1° (likely 34°1° to 40°4°)	34°1°	0%	1 mph2 km/h from E, gusts 13 mph21 km/h	97%	32%	0
Sun 8p	Clear	31°−1° (likely 31°−1° to 38°3°)	31°−1°	0%	1 mph2 km/h from E, gusts 11 mph17 km/h	100%	37%	0
Sun 9p	Clear	29°−2° (likely 29°−2° to 36°2°)	25°−4°	0%	3 mph5 km/h from SE, gusts 9 mph14 km/h	99%	36%	0
Sun 10p	Clear	28°−2° (likely 27°−3° to 35°2°)	24°−4°	0%	3 mph5 km/h from SE, gusts 5 mph8 km/h	99%	40%	0
Sun 11p	Clear	27°−3° (likely 26°−3° to 34°1°)	23°−5°	0%	3 mph5 km/h from SE, gusts 3 mph4 km/h	98%	40%	0
Mon 12a	Clear	27°−3° (likely 25°−4° to 34°1°)	27°−3°	0%	1 mph2 km/h from SSE, gusts 2 mph4 km/h	98%	40%	0
Mon 1a	Clear	26°−3° (likely 24°−4° to 34°1°)	26°−3°	0%	1 mph2 km/h from SSE, gusts 2 mph3 km/h	99%	40%	0
Mon 2a	Partly cloudy	25°−4° (likely 23°−5° to 33°1°)	25°−4°	0%	1 mph2 km/h from SSE, gusts 2 mph4 km/h	99%	44%	0
Mon 3a	Clear	25°−4° (likely 23°−5° to 33°1°)	25°−4°	0%	1 mph2 km/h from SSE, gusts 1 mph2 km/h	100%	40%	0
Mon 4a	Clear	24°−4° (likely 24°−4° to 33°1°)	24°−4°	0%	1 mph2 km/h from SSE, gusts 2 mph3 km/h	100%	39%	0
Mon 5a	Clear	24°−4° (likely 24°−4° to 33°1°)	24°−4°	0%	1 mph2 km/h from SSE, gusts 3 mph5 km/h	100%	33%	0
Mon 6a	Partly cloudy	24°−4° (likely 24°−4° to 32°0°)	24°−4°	0%	0 mph0 km/h, gusts 3 mph5 km/h	100%	33%	0
Mon 7a	Partly cloudy	24°−4° (likely 23°−5° to 34°1°)	24°−4°	0%	0 mph0 km/h, gusts 4 mph6 km/h	100%	14%	0
Mon 8a	Partly sunny	24°−4° (likely 23°−5° to 34°1°)	24°−4°	0%	0 mph0 km/h, gusts 4 mph6 km/h	100%	27%	0

Days ahead

Shaded: typical range for these dates (1991–2020)

Today, Oct 24. Fog. High 42°6°, low 23°−5°. Typical 53°12° / 26°−3°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 36°2°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 41°5°
  Dry
3. Evening
  6 PM–midnight
  Clear, 32°0°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 25°−4°
  Dry
Official NWS forecast
Today: Areas of fog before 10am. Sunny, with a high near 42. North northeast wind 0 to 3 mph.
Tonight: Mostly clear, with a low around 23. South southwest wind around 2 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
40°4°–43°6°
Low, likely
22°−6°–27°−3°
Typical high / low
53°12° / 26°−3°
Wind
6 mph9 km/h
UV peak
4
Tomorrow, Oct 25. Sunny. High 42°6°, low 23°−5°. Typical 52°11° / 26°−3°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 23°−5°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 41°5°
  Dry
3. Evening
  6 PM–midnight
  Clear, 31°−1°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 24°−4°
  Dry
Official NWS forecast
Day: Sunny, with a high near 42. North wind 0 to 3 mph.
Night: Partly cloudy, with a low around 23. East southeast wind around 3 mph.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
42°6°–50°10°
Low, likely
23°−5°–33°1°
Typical high / low
52°11° / 26°−3°
Wind
15 mph23 km/h, gusts 21 mph33 km/h
UV peak
4
Monday, Oct 26. Cloudy. High 49°9°, low 30°−1°. Typical 52°11° / 26°−3°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 24°−4°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 50°10°
  Dry
3. Evening
  6 PM–midnight
  Clear, 41°5°
  40% chance · 0.03 in0.9 mm
4. Overnight
  midnight–6 AM
  Cloudy, 37°3°
  60% chance · 0.2 in0.5 cm
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 49. Northeast wind around 2 mph.
Night: A slight chance of rain before midnight, then a chance of rain and snow. Mostly cloudy, with a low around 30. South southeast wind 1 to 6 mph. Chance of precipitation is 40%.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
45°7°–53°12°
Low, likely
22°−6°–32°0°
Typical high / low
52°11° / 26°−3°
Wind
7 mph10 km/h, gusts 20 mph31 km/h
UV peak
4
Tuesday, Oct 27. Snow. High 45°7°, low 25°−4°. Typical 51°11° / 25°−4°. Snow 0–2 in0–5 cm, 70% chance. Forecasts agree.
1. Morning
  6 AM–noon
  Rain, 37°3°
  60% chance · 0.12 in2.9 mm
2. Afternoon
  noon–6 PM
  Mostly sunny, 46°8°
  50% chance · 0.01 in0.3 mm
3. Evening
  6 PM–midnight
  Partly cloudy, 38°3°
  30% chance
4. Overnight
  midnight–6 AM
  Clear, 32°0°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Rain and snow likely before 3pm, then rain and snow likely. Mostly cloudy, with a high near 45. Southwest wind around 5 mph. Little or no snow accumulation expected.
Night: A chance of rain before midnight, then a chance of rain and snow. Mostly cloudy, with a low around 25. South southwest wind 3 to 9 mph. Little or no snow accumulation expected.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
45°7°–47°8°
Low, likely
25°−4°–38°3°
Typical high / low
51°11° / 25°−4°
Wind
13 mph21 km/h, gusts 25 mph40 km/h
UV peak
3
Wednesday, Oct 28. Partly sunny. High 46°8°, low 25°−4°. Typical 51°11° / 25°−4°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 31°−1°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 49°9°
  Dry
3. Evening
  6 PM–midnight
  Clear, 38°3°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 33°0°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 46.
Night: Partly cloudy, with a low around 25.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
46°8°–50°10°
Low, likely
25°−4°–33°1°
Typical high / low
51°11° / 25°−4°
Wind
8 mph13 km/h, gusts 24 mph38 km/h
UV peak
4
Thursday, Oct 29. Partly sunny. High 46°8°, low 26°−3°. Typical 50°10° / 24°−4°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Partly sunny, 33°0°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 46°8°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 41°5°
  30% chance · 0.03 in0.7 mm
4. Overnight
  midnight–6 AM
  Cloudy, 35°2°
  30% chance · 0.03 in0.7 mm
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 46.
Night: A slight chance of rain and snow. Partly cloudy, with a low around 26.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
45°7°–48°9°
Low, likely
26°−3°–34°1°
Typical high / low
50°10° / 24°−4°
Wind
7 mph11 km/h, gusts 33 mph53 km/h
UV peak
3
Friday, Oct 30. Snow. High 48°9°, low 27°−3°. Typical 50°10° / 24°−4°. Snow < 1 in< 2 cm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Partly sunny, 36°2°
  30% chance · 0.01 in0.3 mm
2. Afternoon
  noon–6 PM
  Cloudy, 47°8°
  30% chance
3. Evening
  6 PM–midnight
  Drizzle, 38°3°
  30% chance · 0.02 in0.5 mm
4. Overnight
  midnight–6 AM
  Snow, 33°1°
  30% chance · 0.02 in0.4 mm
Hours this far out come from computer models only.
Official NWS forecast
Day: A slight chance of snow before 9am, then a chance of rain and snow. Partly sunny, with a high near 48.
Night: A chance of rain before 9pm, then a chance of rain and snow. Mostly cloudy, with a low around 27. Little or no snow accumulation expected.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
41°5°–53°12°
Low, likely
27°−3°–37°3°
Typical high / low
50°10° / 24°−4°
Wind
10 mph16 km/h, gusts 39 mph62 km/h
UV peak
3
Saturday, Oct 31. Snow. High 39°4°, low 27°−3°. Typical 49°9° / 24°−4°. Snow 0–2 in0–5 cm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Snow, 33°1°
  30% chance · 0.3 in0.7 cm
2. Afternoon
  noon–6 PM
  Mostly sunny, 39°4°
  20% chance · 0.02 in0.5 mm
3. Evening
  6 PM–midnight
  Mostly clear, 31°0°
  20% chance
4. Overnight
  midnight–6 AM
  Cloudy, 26°−4°
  20% chance
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
34°1°–42°6°
Low, likely
25°−4°–30°−1°
Typical high / low
49°9° / 24°−4°
Wind
17 mph27 km/h
UV peak
3
Sunday, Nov 1. Cloudy. High 42°6°, low 25°−4°. Typical 49°9° / 23°−5°. Rain 0.01 in0.3 mm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 27°−3°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 41°5°
  Dry
3. Evening
  6 PM–midnight
  Clear, 35°2°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 35°2°
  Dry
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
37°3°–48°9°
Low, likely
19°−7°–28°−2°
Typical high / low
49°9° / 23°−5°
Wind
9 mph14 km/h, gusts 24 mph39 km/h
UV peak
3
Monday, Nov 2. Cloudy. High 44°7°, low 32°0°. Typical 48°9° / 23°−5°. Rain 0.15 in3.8 mm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 36°2°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 45°7°
  Dry
3. Evening
  6 PM–midnight
  Partly cloudy, 38°3°
  Dry
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
35°2°–53°12°
Low, likely
30°−1°–34°1°
Typical high / low
48°9° / 23°−5°
Wind
6 mph9 km/h, gusts 12 mph19 km/h
UV peak
3

10 days15 days30 days

The outlook

Today
Dry, high 42°, low 23°.
Tomorrow
Dry, high 42°, low 23°.
Monday
Dry, high 49°, low 30°, warming up.
Rest of week
Highs 39–48°; chance of precipitation on Tuesday.

Want the meteorologists’ reasoning? Read the NWS forecast discussion (TFX) (opens in a new tab)

What changed since yesterday

No meaningful changes from yesterday’s forecast.

Radar

Radar data: NOAA MRMS, rendered by forecast.blue

Radar loads when scrolled into view

Full-screen radar

Rivers

NOAA river gauges within 25 mi

Hyalite Creek near S 19th near Gallatin Gateway

6.2 mi

Level: 2.3 ft

Reading from Sat 7:30 AM · NWS gauge page

Gallatin River near Gallatin Gateway

7.3 mi

Below flood stage

Level: 1.5 ft
Flow: 430 cfs

Reading from Sat 8 AM · NWS gauge page

Gallatin River above Deer Creek near Big Sky

20 mi

Level: 4.9 ft

Reading from Sat 7:30 AM · NWS gauge page

East Gallatin River near Manhattan

22 mi

Level: 3.2 ft

Reading from Sat 8:15 AM · NWS gauge page

For your home

What this week’s weather means for heating, cooling, pipes and fresh air.

Pipes: watch the cold

Tonight’s low: 25°−4°

Overnight low near 25°F — not yet at drip-the-faucets cold, but worth watching if it's forecast to drop further.

Heating this week

About 64% less heating than a typical week.

This week 67Typical 188

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 47
h below 17°F: 0
h below 5°F: 0

47, 17 and 5°F are the test points heat pumps are rated at. About 21 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 27°F). Indoor air will run dry too — a humidifier keeping indoor relative humidity in the 30–50% range is more comfortable and cuts static shocks, without going so high it fogs cold windows.

Open the windows?

No stretch in the next few days is comfortable enough outside, by temperature, dew point and air quality.

Is this typical?

BOZEMAN GALLATIN FIELD AP · official normals 1991–2020 · records 1941–2026

Oct 24, today vs a typical year

Today’s expected high is 11°6° colder than typical.

Last 7 days vs normal

On average 7°4° warmer than normal (daily mean temperature).

+6°+3°SunOct 18
+8°+4°MonOct 19
+6°+3°TueOct 20
+9°+5°WedOct 21
+14°+8°ThuOct 22
+2°+1°FriOct 23
—SatOct 24

Gallatin Gateway weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 10 h 30 min; Losing 3 min 3 s a day; shortest Dec 21, 1 h 48 min less
Golden hour: 5:42–6:42 PM; Morning 7:34–8:35 AM
Blue hour: 6:42–6:54 PM; Morning 7:23–7:34 AM; first light 7:23 AM

Stars tonight? Fair

Clear 6:54 PM–7:24 AM, but the moon is 99% lit and up.

Moon

Waxing gibbous

97% lit · growing

Today: sets 6:08 AM · rises 5:24 PM
Full moon: Oct 25
New moon: Nov 9

Looking south from Gallatin Gateway. The highest point on the skyline is about 10,800 ft, 17 mi away.Skyline from USGS elevation data, heights drawn up to 4× taller. Sky, sun and moon as they are now.

1 active weather alert

Special Weather Statement