Observed 5:35 AM MDT at KHLN

Unionville, MT weather

Clear and 27°−3°, 16°9° colder than a typical Oct 24, drip faucets tonight, low 16°−9°.

Forecasts differ

Now 27°−3°

Clear · Feels like 21°−6°

Feels like: 21°−6°; Wind chill from 5 mph7 km/h wind · air 27°−3°
Wind: 5 mph7 km/h; From the south-southeast. Up to 6 mph10 km/h through 5 PM
Dew point: 21°−6°; Dry · up to 31°−1° by 2 PM
UV index: 0Low; Moderate 12–5 PM · peak 4
Air quality: 32Good; Main pollutant: PM2.5 (fine particles)

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

22°12° cooler than this time yesterday (48°9° then, 26°−3° now)

Good hours for

Hard freeze until 1 PM (low 16°−9°)
Above 30°−1° today by noon
Hard freeze tonight 8 PM–tomorrow 3 PM (low 26°−3°)
Fog tomorrow 9 AM–2 PM
Hard freeze tomorrow from 5 PM (low 27°−3°)

This morningUp to 27°−3° by 11 AM · freezing, low 16°−9° · Clear
This afternoonUp to 37°3° by 4 PM · freezing, low 31°−1° · Clear
TonightDown to 28°−2° by 3 AM · freezing, low 28°−2° · Partly cloudy
Tomorrow morningNear 29°−2° · Mostly cloudy · freezing, low 26°−3°
Tomorrow afternoonUp to 34°1° by 4 PM · freezing, low 30°−1° · Mostly cloudy
Tomorrow nightDown to 27°−3° by 4 AM · freezing, low 27°−3° · Mostly cloudy

Hourly forecast, next 48 hours, in the place's local time
Hour	Conditions	Temperature	Feels like	Precipitation	Wind	Humidity	Cloud cover	UV index
Sat 5a	Clear	16°−9° (likely 16°−9° to 24°−4°)	11°−12°	0%	3 mph5 km/h from S, gusts 9 mph15 km/h	90%	3%	0
Sat 6a	Clear	16°−9° (likely 16°−9° to 25°−4°)	11°−12°	0%	3 mph5 km/h from S, gusts 10 mph16 km/h	90%	4%	0
Sat 7a	Clear	16°−9° (likely 16°−9° to 25°−4°)	9°−13°	0%	5 mph8 km/h from S, gusts 8 mph12 km/h	90%	4%	0
Sat 8a	Sunny	16°−9° (likely 16°−9° to 25°−4°)	9°−13°	0%	5 mph8 km/h from SSW, gusts 9 mph15 km/h	90%	3%	0
Sat 9a	Sunny	19°−7° (likely 19°−7° to 28°−2°)	11°−12°	0%	6 mph10 km/h from S, gusts 9 mph14 km/h	90%	2%	0
Sat 10a	Sunny	24°−4° (likely 24°−4° to 33°1°)	24°−4°	0%	2 mph3 km/h from S, gusts 8 mph14 km/h	80%	2%	1
Sat 11a	Sunny	27°−3° (likely 27°−3° to 35°2°)	27°−3°	0%	2 mph3 km/h from S, gusts 9 mph15 km/h	80%	1%	2
Sat 12p	Sunny	31°−1° (likely 31°−1° to 37°3°)	27°−3°	0%	3 mph5 km/h from SSE, gusts 8 mph13 km/h	80%	1%	3
Sat 1p	Sunny	34°1° (likely 34°1° to 39°4°)	31°−1°	0%	3 mph5 km/h from SSE, gusts 7 mph12 km/h	81%	4%	4
Sat 2p	Mostly sunny	36°2° (likely 36°2° to 41°5°)	33°1°	0%	3 mph5 km/h from SSE, gusts 8 mph13 km/h	81%	25%	4
Sat 3p	Partly sunny	36°2° (likely 36°2° to 42°6°)	36°2°	0%	2 mph3 km/h from SSE, gusts 6 mph10 km/h	93%	31%	3
Sat 4p	Sunny	37°3° (likely 37°3° to 43°6°)	37°3°	0%	2 mph3 km/h from SSE, gusts 5 mph8 km/h	90%	13%	3
Sat 5p	Partly sunny	35°2° (likely 35°2° to 42°6°)	35°2°	0%	1 mph2 km/h from S, gusts 6 mph9 km/h	91%	53%	1
Sat 6p	Partly cloudy	34°1° (likely 33°1° to 39°4°)	34°1°	0%	1 mph2 km/h from SW, gusts 4 mph6 km/h	92%	50%	0
Sat 7p	Mostly clear	33°1° (likely 30°−1° to 37°3°)	33°1°	0%	2 mph3 km/h from SSW, gusts 4 mph6 km/h	86%	54%	0
Sat 8p	Mostly clear	32°0° (likely 28°−2° to 36°2°)	32°0°	0%	2 mph3 km/h from S, gusts 3 mph5 km/h	86%	54%	0
Sat 9p	Clear	31°−1° (likely 26°−3° to 35°2°)	28°−2°	0%	3 mph5 km/h from SSW, gusts 6 mph9 km/h	84%	28%	0
Sat 10p	Clear	31°−1° (likely 25°−4° to 35°2°)	28°−2°	0%	3 mph5 km/h from SSW, gusts 7 mph11 km/h	81%	24%	0
Sat 11p	Partly cloudy	30°−1° (likely 25°−4° to 37°3°)	30°−1°	0%	2 mph3 km/h from SSW, gusts 7 mph12 km/h	81%	43%	0
Sun 12a	Clear	29°−2° (likely 25°−4° to 35°2°)	29°−2°	0%	2 mph3 km/h from S, gusts 7 mph11 km/h	80%	16%	0
Sun 1a	Clear	29°−2° (likely 24°−4° to 35°2°)	29°−2°	0%	1 mph2 km/h from SSW, gusts 6 mph9 km/h	75%	8%	0
Sun 2a	Clear	29°−2° (likely 23°−5° to 35°2°)	29°−2°	0%	1 mph2 km/h from SSW, gusts 5 mph7 km/h	75%	5%	0
Sun 3a	Mostly clear	28°−2° (likely 22°−6° to 35°2°)	28°−2°	0%	1 mph2 km/h from SW, gusts 3 mph5 km/h	76%	18%	0
Sun 4a	Clear	28°−2° (likely 23°−5° to 33°1°)	28°−2°	0%	0 mph0 km/h, gusts 3 mph5 km/h	77%	16%	0
Sun 5a	Clear	28°−2° (likely 24°−4° to 32°0°)	28°−2°	0%	0 mph0 km/h, gusts 4 mph6 km/h	77%	22%	0
Sun 6a	Mostly clear	27°−3° (likely 23°−5° to 30°−1°)	27°−3°	0%	0 mph0 km/h, gusts 5 mph8 km/h	77%	43%	0
Sun 7a	Partly cloudy	27°−3° (likely 23°−5° to 29°−2°)	27°−3°	0%	0 mph0 km/h, gusts 6 mph9 km/h	76%	55%	0
Sun 8a	Cloudy	26°−3° (likely 23°−5° to 28°−2°)	26°−3°	0%	0 mph0 km/h, gusts 6 mph9 km/h	75%	84%	0
Sun 9a	Fog	27°−3° (likely 24°−4° to 28°−2°)	27°−3°	0%	1 mph2 km/h from NNW, gusts 7 mph12 km/h	77%	88%	0
Sun 10a	Fog	28°−2° (likely 25°−4° to 30°−1°)	28°−2°	0%	1 mph2 km/h from NNW, gusts 7 mph11 km/h	79%	89%	1
Sun 11a	Fog	30°−1° (likely 27°−3° to 31°−1°)	30°−1°	0%	1 mph2 km/h from NNW, gusts 6 mph10 km/h	82%	89%	1
Sun 12p	Fog	30°−1° (likely 29°−2° to 32°0°)	26°−3°	0%	3 mph5 km/h from NNE, gusts 7 mph11 km/h	87%	89%	2
Sun 1p	Fog	32°0° (likely 30°−1° to 33°1°)	29°−2°	0%	3 mph5 km/h from NNE, gusts 6 mph10 km/h	90%	88%	2
Sun 2p	Cloudy	32°0° (likely 31°−1° to 35°2°)	29°−2°	0%	3 mph5 km/h from NNE, gusts 6 mph10 km/h	92%	86%	3
Sun 3p	Cloudy	33°1° (likely 32°0° to 37°3°)	33°1°	0%	2 mph3 km/h from NNE, gusts 8 mph13 km/h	94%	83%	2
Sun 4p	Partly sunny	34°1° (likely 31°−1° to 37°3°)	34°1°	0%	2 mph3 km/h from NNE, gusts 6 mph10 km/h	91%	69%	2
Sun 5p	Cloudy	32°0° (likely 30°−1° to 37°3°)	32°0°	0%	2 mph3 km/h from NNE, gusts 7 mph11 km/h	90%	81%	1
Sun 6p	Cloudy	31°−1° (likely 28°−2° to 35°2°)	31°−1°	0%	1 mph2 km/h from NNW, gusts 7 mph12 km/h	93%	80%	0
Sun 7p	Mostly cloudy	31°−1° (likely 26°−3° to 33°1°)	31°−1°	0%	1 mph2 km/h from NNW, gusts 7 mph11 km/h	85%	84%	0
Sun 8p	Cloudy	30°−1° (likely 25°−4° to 32°0°)	30°−1°	0%	1 mph2 km/h from NNW, gusts 6 mph10 km/h	83%	79%	0
Sun 9p	Cloudy	28°−2° (likely 25°−4° to 32°0°)	28°−2°	0%	1 mph2 km/h from NNW, gusts 7 mph11 km/h	85%	82%	0
Sun 10p	Cloudy	28°−2° (likely 23°−5° to 32°0°)	28°−2°	0%	1 mph2 km/h from NNW, gusts 6 mph9 km/h	85%	89%	0
Sun 11p	Cloudy	28°−2° (likely 22°−6° to 32°0°)	28°−2°	0%	1 mph2 km/h from NNW, gusts 5 mph8 km/h	84%	89%	0
Mon 12a	Mostly cloudy	28°−2° (likely 22°−6° to 32°0°)	28°−2°	0%	1 mph2 km/h from S, gusts 5 mph8 km/h	83%	92%	0
Mon 1a	Mostly cloudy	28°−2° (likely 20°−7° to 34°1°)	28°−2°	0%	1 mph2 km/h from S, gusts 5 mph9 km/h	81%	84%	0
Mon 2a	Partly cloudy	28°−2° (likely 20°−7° to 34°1°)	28°−2°	0%	1 mph2 km/h from S, gusts 5 mph8 km/h	79%	75%	0
Mon 3a	Mostly cloudy	28°−2° (likely 21°−6° to 33°1°)	28°−2°	0%	2 mph3 km/h from S, gusts 5 mph9 km/h	77%	68%	0
Mon 4a	Mostly cloudy	27°−3° (likely 21°−6° to 32°0°)	27°−3°	0%	2 mph3 km/h from S, gusts 6 mph9 km/h	77%	64%	0

Days ahead

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

Today, Oct 24. Fog. High 37°3°, low 16°−9°. Typical 53°12° / 30°−1°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 16°−9°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 37°3°
  Dry
3. Evening
  6 PM–midnight
  Clear, 32°0°
  Dry
4. Overnight
  midnight–6 AM
  Mostly clear, 28°−2°
  Dry
Official NWS forecast
Today: Patchy fog before 9am. Sunny, with a high near 37. South wind 1 to 6 mph.
Tonight: Patchy fog. Mostly clear, with a low around 16. South wind around 3 mph.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
37°3°–43°6°
Low, likely
16°−9°–23°−5°
Typical high / low
53°12° / 30°−1°
Wind
11 mph18 km/h
UV peak
4
Tomorrow, Oct 25. Fog. High 34°1°, low 26°−3°. Typical 53°12° / 30°−1°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Fog, 26°−3°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 34°1°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 30°−1°
  Dry
4. Overnight
  midnight–6 AM
  Mostly cloudy, 24°−4°
  Dry
Official NWS forecast
Day: Mostly sunny, with a high near 34. North northwest wind 0 to 3 mph.
Night: Mostly cloudy, with a low around 26. West wind around 2 mph.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
32°0°–37°3°
Low, likely
22°−6°–28°−2°
Typical high / low
53°12° / 30°−1°
Wind
7 mph10 km/h, gusts 15 mph23 km/h
UV peak
3
Monday, Oct 26. Mostly cloudy. High 42°6°, low 33°1°. Typical 52°11° / 30°−1°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 24°−4°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 45°7°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 36°2°
  20% chance · 0.02 in0.4 mm
4. Overnight
  midnight–6 AM
  Drizzle, 36°2°
  40% chance · 0.07 in1.8 mm
Hours this far out come from computer models only.
Official NWS forecast
Day: Partly sunny, with a high near 42. Southeast wind around 3 mph.
Night: A chance of rain before midnight, then a chance of rain and snow. Mostly cloudy, with a low around 33. South southwest wind around 5 mph.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
42°6°–50°10°
Low, likely
18°−8°–33°1°
Typical high / low
52°11° / 30°−1°
Wind
5 mph9 km/h, gusts 15 mph24 km/h
UV peak
3
Tuesday, Oct 27. Snow. High 41°5°, low 29°−2°. Typical 52°11° / 29°−2°. Snow 0.11 in2.8 mm, 50% chance. Forecasts agree.
1. Morning
  6 AM–noon
  Drizzle, 36°2°
  40% chance · 0.04 in0.9 mm
2. Afternoon
  noon–6 PM
  Drizzle, 44°7°
  30% chance
3. Evening
  6 PM–midnight
  Clear, 35°2°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 32°0°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: A chance of rain and snow. Partly sunny, with a high near 41. West southwest wind 5 to 10 mph, with gusts as high as 18 mph.
Night: A chance of rain before midnight, then a chance of snow. Mostly cloudy, with a low around 29. Little or no snow accumulation expected.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
41°5°–45°7°
Low, likely
28°−2°–35°2°
Typical high / low
52°11° / 29°−2°
Wind
18 mph29 km/h, gusts 44 mph70 km/h
UV peak
3
Wednesday, Oct 28. Snow. High 38°3°, low 27°−3°. Typical 51°11° / 29°−2°. Snow, 20% chance. Mostly agree.
1. Morning
  6 AM–noon
  Mostly sunny, 31°−1°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 47°8°
  Dry
3. Evening
  6 PM–midnight
  Clear, 36°2°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 30°−1°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: A slight chance of snow. Partly sunny, with a high near 38.
Night: A slight chance of snow. Mostly cloudy, with a low around 27.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
38°3°–48°9°
Low, likely
27°−3°–34°1°
Typical high / low
51°11° / 29°−2°
Wind
11 mph17 km/h, gusts 24 mph38 km/h
UV peak
3
Thursday, Oct 29. Snow. High 36°2°, low 28°−2°. Typical 51°11° / 28°−2°. Snow 0.02 in0.5 mm, 20% chance. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 30°−1°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 38°3°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 32°0°
  20% chance · 0.02 in0.4 mm
4. Overnight
  midnight–6 AM
  Cloudy, 28°−2°
  30% chance · 0.1 in0.3 cm
Hours this far out come from computer models only.
Official NWS forecast
Day: A slight chance of snow before noon. Partly sunny, with a high near 36.
Night: A slight chance of snow. Mostly cloudy, with a low around 28.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
36°2°–42°6°
Low, likely
25°−4°–29°−2°
Typical high / low
51°11° / 28°−2°
Wind
7 mph12 km/h, gusts 15 mph24 km/h
UV peak
3
Friday, Oct 30. Snow. High 40°4°, low 27°−3°. Typical 50°10° / 28°−2°. Snow 0–2 in0–5 cm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Snow, 29°−2°
  30% chance · 0.2 in0.4 cm
2. Afternoon
  noon–6 PM
  Drizzle, 38°3°
  30% chance · 0.05 in1.4 mm
3. Evening
  6 PM–midnight
  Cloudy, 33°0°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 29°−2°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: A slight chance of snow. Partly sunny, with a high near 40. Little or no snow accumulation expected.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
32°0°–45°7°
Low, likely
22°−6°–31°−1°
Typical high / low
50°10° / 28°−2°
Wind
5 mph8 km/h, gusts 17 mph27 km/h
Saturday, Oct 31. Cloudy. High 36°2°, low 24°−4°. Typical 50°10° / 28°−2°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 28°−2°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 36°2°
  Dry
3. Evening
  6 PM–midnight
  Clear, 27°−3°
  Dry
4. Overnight
  midnight–6 AM
  Mostly clear, 26°−4°
  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
32°0°–39°4°
Low, likely
22°−6°–27°−3°
Typical high / low
50°10° / 28°−2°
Wind
12 mph19 km/h, gusts 23 mph37 km/h
UV peak
3
Sunday, Nov 1. Mostly sunny. High 39°4°, low 25°−4°. Typical 49°9° / 27°−3°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Mostly sunny, 28°−2°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 38°3°
  Dry
3. Evening
  6 PM–midnight
  Clear, 33°1°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 32°0°
  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°–45°7°
Low, likely
21°−6°–30°−1°
Typical high / low
49°9° / 27°−3°
Wind
14 mph22 km/h, gusts 33 mph54 km/h
UV peak
3
Monday, Nov 2. Cloudy. High 42°6°, low 29°−2°. Typical 49°9° / 27°−3°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 35°2°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 44°7°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 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
34°1°–49°9°
Low, likely
28°−2°–30°−1°
Typical high / low
49°9° / 27°−3°
Wind
6 mph10 km/h
UV peak
3

10 days15 days30 days

The outlook

Today
Dry, high 37°, low 16°.
Tomorrow
Dry, high 34°, low 26°, cooling off.
Monday
Dry, high 42°, low 33°, warming up.
Rest of week
Highs 36–42°; 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

Tenmile Creek (MT) near Helena

4.0 mi

Below flood stage

Level: 2.9 ft
Flow: 69 cfs

Reading from Sat 4:15 AM · NWS gauge page

Prickly Pear Creek near Clancy

6.9 mi

Level: 1.1 ft
Flow: 51 cfs

Reading from Fri 10:30 PM · NWS gauge page

Tenmile Creek (MT) near Rimini

8.3 mi

Level: 1.9 ft
Flow: 17 cfs

Reading from Sat 4:45 AM · NWS gauge page

Missouri River at Helena Valley Reservoir

12 mi

Below flood stage

Level: 3818 ft

Reading from Sat 4:15 AM · NWS gauge page

For your home

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

Drip faucets tonight

Tonight’s low: 16°−9°

Overnight low of 16°F for 4+ hours — cold enough that pipes in unheated spaces can freeze. Let faucets on exterior walls drip overnight.

Heating this week

About 59% less heating than a typical week.

This week 71Typical 172

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 47
h below 17°F: 3
h below 5°F: 0

47, 17 and 5°F are the test points heat pumps are rated at. About 28 hours are near freezing and damp, when outdoor units defrost more often.

Cold-climate heat pump? Look up certified models on rebate.blue (opens in a new tab)

Comfort

Dry air outside (dew point 21°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?

Helena Airport Asos · official normals 1991–2020 · records 1880–2026

Oct 24, today vs a typical year

Today’s expected high is 16°9° colder than typical.

Last 7 days vs normal

On average 5°3° warmer than normal (daily mean temperature).

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

Unionville weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 10 h 27 min; Losing 3 min 3 s a day; shortest Dec 21, 1 h 53 min less
Golden hour: 5:43–6:44 PM; Morning 7:39–8:41 AM
Blue hour: 6:44–6:56 PM; Morning 7:27–7:39 AM; first light 7:27 AM

Stars tonight? Good

Clear 5:57–7:27 AM; moon 96% lit but below the horizon.

Moon

Waxing gibbous

96% lit · growing

Today: sets 6:13 AM · rises 5:26 PM
Full moon: Oct 25
New moon: Nov 9

Looking south from Unionville. The highest point on the skyline is about 7,600 ft, 9 mi away.Skyline from USGS elevation data, heights drawn up to 2× taller. Sky, sun and moon as they are now.