Observed 6:53 AM MDT at KBIL

Roundup, MT weather

Mostly clear and 32°0°.

Forecasts agree

Now 32°0°

Mostly clear · Feels like 24°−5°

Feels like: 24°−5°; Wind chill from 10 mph17 km/h wind · air 32°0°
Wind: 10 mph17 km/h; From the southwest. Up to 10 mph17 km/h through 7 PM
Dew point: 27°−3°; Dry, static shocks likely
UV index: 0Low; Moderate 12–4 PM · peak 4
Pressure: 30.38 inHg1029 hPa; Rising · +0.05 inHg+1.7 hPa in 3 h

None rain now, through the next 2 hours.

From forecast models

Next 48 hours

Good hours for

Hard freeze until 10 AM (low 26°−3°)
Above 40°4° today by 11 AM
Below 40°4° tonight after 8 PM
Hard freeze tonight midnight–10 AM (low 25°−4°)
Below freezing tomorrow night from 3 AM (low 30°−1°)

This morningUp to 40°4° by 11 AM · freezing, low 26°−3° · Clear
This afternoonUp to 51°11° by 4 PM · Clear
TonightDown to 26°−3° by 5 AM · freezing, low 26°−3° · Clear
Tomorrow morningUp to 37°3° by 11 AM · freezing, low 25°−4° · Clear
Tomorrow afternoonUp to 48°9° by 4 PM · Clear
Tomorrow nightDown to 30°−1° by 5 AM · freezing, low 30°−1° · Partly 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 7a	Clear	27°−3° (likely 26°−3° to 31°−1°)	19°−7°	0%	7 mph11 km/h from SW, gusts 9 mph15 km/h	90%	0%	0
Sat 8a	Sunny	26°−3° (likely 26°−3° to 32°0°)	20°−7°	0%	6 mph10 km/h from SSW, gusts 10 mph16 km/h	91%	0%	0
Sat 9a	Sunny	29°−2° (likely 28°−2° to 33°1°)	23°−5°	0%	6 mph10 km/h from SSW, gusts 10 mph16 km/h	84%	0%	0
Sat 10a	Sunny	34°1° (likely 34°1° to 37°3°)	29°−2°	0%	6 mph10 km/h from SSW, gusts 11 mph18 km/h	72%	0%	1
Sat 11a	Sunny	40°4° (likely 39°4° to 41°5°)	35°2°	0%	7 mph11 km/h from SW, gusts 13 mph21 km/h	57%	0%	2
Sat 12p	Sunny	44°7° (likely 43°6° to 45°7°)	39°4°	0%	8 mph13 km/h from SW, gusts 14 mph23 km/h	46%	0%	3
Sat 1p	Sunny	48°9° (likely 46°8° to 48°9°)	44°7°	0%	8 mph13 km/h from SSW, gusts 15 mph24 km/h	39%	0%	4
Sat 2p	Sunny	49°9° (likely 48°9° to 50°10°)	46°8°	0%	8 mph13 km/h from S, gusts 16 mph26 km/h	35%	0%	4
Sat 3p	Sunny	50°10° (likely 49°9° to 51°11°)	47°8°	0%	8 mph13 km/h from S, gusts 16 mph26 km/h	33%	0%	3
Sat 4p	Sunny	51°11° (likely 49°9° to 51°11°)	48°9°	0%	7 mph11 km/h from S, gusts 15 mph24 km/h	33%	0%	2
Sat 5p	Sunny	49°9° (likely 47°8° to 50°10°)	47°8°	0%	6 mph10 km/h from SSE, gusts 13 mph20 km/h	36%	0%	1
Sat 6p	Clear	47°8° (likely 44°7° to 47°8°)	46°8°	0%	3 mph5 km/h from SE, gusts 11 mph17 km/h	43%	0%	0
Sat 7p	Clear	43°6° (likely 39°4° to 43°6°)	43°6°	0%	2 mph3 km/h from SE, gusts 7 mph12 km/h	51%	0%	0
Sat 8p	Clear	39°4° (likely 37°3° to 41°5°)	39°4°	0%	1 mph2 km/h from ESE, gusts 4 mph7 km/h	55%	0%	0
Sat 9p	Clear	36°2° (likely 36°2° to 39°4°)	36°2°	0%	1 mph2 km/h from E, gusts 4 mph6 km/h	61%	0%	0
Sat 10p	Clear	34°1° (likely 34°1° to 39°4°)	34°1°	0%	1 mph2 km/h from NE, gusts 3 mph4 km/h	64%	0%	0
Sat 11p	Clear	33°1° (likely 33°1° to 38°3°)	33°1°	0%	0 mph0 km/h, gusts 3 mph4 km/h	66%	0%	0
Sun 12a	Clear	32°0° (likely 32°0° to 36°2°)	32°0°	0%	1 mph2 km/h from N, gusts 3 mph5 km/h	68%	0%	0
Sun 1a	Clear	31°−1° (likely 30°−1° to 35°2°)	31°−1°	0%	1 mph2 km/h from NNW, gusts 4 mph6 km/h	70%	0%	0
Sun 2a	Clear	30°−1° (likely 29°−2° to 34°1°)	30°−1°	0%	1 mph2 km/h from N, gusts 4 mph6 km/h	71%	0%	0
Sun 3a	Clear	28°−2° (likely 27°−3° to 33°1°)	28°−2°	0%	1 mph2 km/h from NNW, gusts 3 mph5 km/h	76%	1%	0
Sun 4a	Clear	27°−3° (likely 26°−3° to 32°0°)	27°−3°	0%	2 mph3 km/h from N, gusts 3 mph5 km/h	80%	0%	0
Sun 5a	Clear	26°−3° (likely 25°−4° to 32°0°)	22°−6°	0%	3 mph5 km/h from NNE, gusts 3 mph5 km/h	82%	0%	0
Sun 6a	Clear	26°−3° (likely 24°−4° to 32°0°)	20°−7°	0%	5 mph8 km/h from NNE, gusts 4 mph6 km/h	87%	0%	0
Sun 7a	Clear	26°−3° (likely 24°−4° to 32°0°)	20°−7°	0%	5 mph8 km/h from NNE, gusts 4 mph7 km/h	84%	0%	0
Sun 8a	Sunny	25°−4° (likely 24°−4° to 32°0°)	19°−7°	0%	5 mph8 km/h from NNE, gusts 4 mph7 km/h	87%	0%	0
Sun 9a	Sunny	27°−3° (likely 27°−3° to 34°1°)	19°−7°	0%	8 mph13 km/h from NNE, gusts 6 mph9 km/h	82%	0%	0
Sun 10a	Sunny	33°1° (likely 32°0° to 37°3°)	26°−3°	0%	8 mph13 km/h from NNE, gusts 12 mph20 km/h	73%	0%	1
Sun 11a	Sunny	37°3° (likely 36°2° to 40°4°)	31°−1°	0%	8 mph13 km/h from NNE, gusts 15 mph24 km/h	62%	0%	2
Sun 12p	Sunny	41°5° (likely 39°4° to 43°6°)	35°2°	0%	9 mph14 km/h from NE, gusts 15 mph23 km/h	55%	0%	3
Sun 1p	Sunny	44°7° (likely 41°5° to 46°8°)	39°4°	0%	9 mph14 km/h from NE, gusts 16 mph26 km/h	49%	0%	4
Sun 2p	Sunny	47°8° (likely 43°6° to 49°9°)	43°6°	0%	9 mph14 km/h from NE, gusts 17 mph28 km/h	47%	0%	4
Sun 3p	Sunny	47°8° (likely 44°7° to 50°10°)	43°6°	0%	9 mph14 km/h from ENE, gusts 18 mph28 km/h	44%	1%	3
Sun 4p	Sunny	48°9° (likely 45°7° to 51°11°)	43°6°	0%	9 mph14 km/h from ENE, gusts 17 mph28 km/h	44%	1%	2
Sun 5p	Sunny	48°9° (likely 44°7° to 51°11°)	43°6°	0%	9 mph14 km/h from ENE, gusts 17 mph27 km/h	44%	2%	1
Sun 6p	Clear	45°7° (likely 42°6° to 47°8°)	42°6°	0%	6 mph10 km/h from ENE, gusts 15 mph24 km/h	50%	2%	0
Sun 7p	Clear	42°6° (likely 39°4° to 45°7°)	39°4°	0%	6 mph10 km/h from ENE, gusts 12 mph19 km/h	57%	40%	0
Sun 8p	Partly cloudy	41°5° (likely 37°3° to 42°6°)	37°3°	0%	6 mph10 km/h from ENE, gusts 11 mph18 km/h	61%	20%	0
Sun 9p	Clear	37°3° (likely 34°1° to 40°4°)	33°1°	0%	5 mph8 km/h from NE, gusts 11 mph17 km/h	67%	6%	0
Sun 10p	Clear	35°2° (likely 32°0° to 40°4°)	31°−1°	0%	5 mph8 km/h from NE, gusts 11 mph17 km/h	74%	36%	0
Sun 11p	Mostly clear	35°2° (likely 31°−1° to 40°4°)	31°−1°	0%	5 mph8 km/h from NE, gusts 10 mph15 km/h	77%	51%	0
Mon 12a	Cloudy	34°1° (likely 31°−1° to 40°4°)	30°−1°	10%	5 mph8 km/h from ENE, gusts 9 mph15 km/h	82%	52%	0
Mon 1a	Partly cloudy	34°1° (likely 31°−1° to 38°3°)	30°−1°	10%	5 mph8 km/h from ENE, gusts 7 mph11 km/h	85%	45%	0
Mon 2a	Partly cloudy	33°1° (likely 33°1° to 37°3°)	29°−2°	10%	5 mph8 km/h from ENE, gusts 7 mph11 km/h	89%	49%	0
Mon 3a	Mostly cloudy	32°0° (likely 32°0° to 36°2°)	28°−2°	10%	3 mph5 km/h from ENE, gusts 7 mph12 km/h	93%	51%	0
Mon 4a	Mostly cloudy	31°−1° (likely 31°−1° to 36°2°)	27°−3°	10%	3 mph5 km/h from ENE, gusts 7 mph11 km/h	96%	48%	0
Mon 5a	Mostly cloudy	30°−1° (likely 30°−1° to 35°2°)	27°−3°	10%	3 mph5 km/h from ENE, gusts 6 mph10 km/h	99%	44%	0
Mon 6a	Mostly cloudy	30°−1° (likely 29°−2° to 35°2°)	30°−1°	0%	2 mph3 km/h from E, gusts 6 mph10 km/h	100%	53%	0

Days ahead

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

Today, Oct 24. Mostly sunny. High 51°11°, low 25°−4°. Typical 55°13° / 26°−3°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 26°−3°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 51°11°
  Dry
3. Evening
  6 PM–midnight
  Clear, 39°4°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 26°−3°
  Dry
Official NWS forecast
Today: Sunny. High near 51, with temperatures falling to around 49 in the afternoon. South southwest wind around 8 mph.
Tonight: Mostly clear, with a low around 25. Northeast wind 0 to 3 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
49°9°–51°11°
Low, likely
25°−4°–31°−1°
Typical high / low
55°13° / 26°−3°
Wind
13 mph21 km/h, gusts 24 mph38 km/h
UV peak
4
Tomorrow, Oct 25. Mostly sunny. High 48°9°, low 30°−1°. Typical 55°13° / 25°−4°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 25°−4°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 48°9°
  Dry
3. Evening
  6 PM–midnight
  Clear, 41°5°
  Dry
4. Overnight
  midnight–6 AM
  Mostly cloudy, 30°−1°
  Dry
Official NWS forecast
Day: Sunny, with a high near 48. Northeast wind 5 to 9 mph.
Night: Partly cloudy, with a low around 30. East northeast wind around 6 mph.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
45°7°–51°11°
Low, likely
23°−5°–32°0°
Typical high / low
55°13° / 25°−4°
Wind
13 mph20 km/h, gusts 22 mph35 km/h
UV peak
4
Monday, Oct 26. Mostly cloudy. High 51°11°, low 29°−2°. Typical 55°13° / 25°−4°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 33°0°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 50°10°
  Dry
3. Evening
  6 PM–midnight
  Clear, 41°5°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 32°0°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Partly sunny. High near 51, with temperatures falling to around 49 in the afternoon. East southeast wind 2 to 7 mph.
Night: Mostly cloudy, with a low around 29. East wind around 3 mph.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
47°8°–54°12°
Low, likely
29°−2°–33°1°
Typical high / low
55°13° / 25°−4°
Wind
11 mph18 km/h, gusts 21 mph34 km/h
UV peak
4
Tuesday, Oct 27. Showers. High 51°11°, low 31°−1°. Typical 54°12° / 24°−4°. Rain 0.2 in5.1 mm, 40% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 33°1°
  40% chance · 0.2 in0.5 cm
2. Afternoon
  noon–6 PM
  Cloudy, 49°9°
  40% chance · 0.07 in1.9 mm
3. Evening
  6 PM–midnight
  Cloudy, 44°6°
  20% chance · 0.02 in0.4 mm
4. Overnight
  midnight–6 AM
  Clear, 35°2°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: A chance of rain showers. Mostly cloudy. High near 51, with temperatures falling to around 49 in the afternoon. Southwest wind 2 to 8 mph. Chance of precipitation is 40%.
Night: A chance of rain showers. Mostly cloudy, with a low around 31. West northwest wind around 7 mph. Chance of precipitation is 30%.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
45°7°–52°11°
Low, likely
28°−2°–35°2°
Typical high / low
54°12° / 24°−4°
Wind
17 mph28 km/h, gusts 30 mph49 km/h
UV peak
3
Wednesday, Oct 28. Partly sunny. High 53°12°, low 25°−4°. Typical 54°12° / 24°−4°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 35°2°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 55°13°
  Dry
3. Evening
  6 PM–midnight
  Clear, 42°5°
  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. High near 53, with temperatures falling to around 50 in the afternoon. West wind around 8 mph.
Night: Partly cloudy. Low around 25, with temperatures rising to around 27 overnight. North northeast wind around 6 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
53°12°–56°13°
Low, likely
25°−4°–38°3°
Typical high / low
54°12° / 24°−4°
Wind
13 mph21 km/h, gusts 25 mph40 km/h
UV peak
3
Thursday, Oct 29. Cloudy. High 48°9°, low 26°−3°. Typical 53°12° / 24°−4°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 32°0°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 49°9°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 42°5°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 36°2°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny. High near 48, with temperatures falling to around 45 in the afternoon. Northeast wind around 7 mph.
Night: Mostly cloudy, with a low around 26. North northeast wind 2 to 6 mph.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
42°6°–54°12°
Low, likely
26°−3°–33°1°
Typical high / low
53°12° / 24°−4°
Wind
13 mph21 km/h, gusts 22 mph36 km/h
UV peak
3
Friday, Oct 30. Mostly cloudy. High 50°10°, low 28°−2°. Typical 53°12° / 23°−5°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 36°2°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 44°7°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 40°5°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 35°2°
  30% chance · 0.2 in0.4 cm
Hours this far out come from computer models only.
Official NWS forecast
Day: Partly sunny. High near 50, with temperatures falling to around 47 in the afternoon. North northwest wind around 5 mph.
Night: A chance of rain and snow showers. Mostly cloudy, with a low around 28. North wind 2 to 6 mph.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
40°4°–51°11°
Low, likely
28°−2°–39°4°
Typical high / low
53°12° / 23°−5°
Wind
10 mph16 km/h, gusts 22 mph35 km/h
UV peak
2
Saturday, Oct 31. Partly sunny. High 43°6°, low 32°0°. Typical 52°11° / 23°−5°. Rain 0.07 in1.8 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Mostly sunny, 35°2°
  30% chance · 0.1 in0.3 cm
2. Afternoon
  noon–6 PM
  Cloudy, 43°6°
  20% chance
3. Evening
  6 PM–midnight
  Partly cloudy, 36°2°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 31°−1°
  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°–52°11°
Low, likely
21°−6°–38°3°
Typical high / low
52°11° / 23°−5°
Wind
21 mph34 km/h, gusts 26 mph42 km/h
UV peak
3
Sunday, Nov 1. Mostly sunny. High 46°8°, low 30°−1°. Typical 52°11° / 23°−5°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 33°1°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 45°7°
  Dry
3. Evening
  6 PM–midnight
  Clear, 37°3°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 36°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
40°4°–53°12°
Low, likely
18°−8°–35°2°
Typical high / low
52°11° / 23°−5°
Wind
17 mph27 km/h, gusts 30 mph49 km/h
UV peak
3
Monday, Nov 2. Cloudy. High 49°9°, low 35°2°. Typical 52°11° / 22°−6°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 37°3°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 51°11°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 41°5°
  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°–62°17°
Low, likely
31°−1°–39°4°
Typical high / low
52°11° / 22°−6°
Wind
16 mph26 km/h, gusts 29 mph47 km/h
UV peak
3

10 days15 days30 days

The outlook

Today
Dry, high 51°, low 25°.
Tomorrow
Dry, high 48°, low 30°, cooling off.
Monday
Dry, high 51°, low 29°, warming up.
Rest of week
Highs 43–53°; chance of precipitation on Tuesday.

Want the meteorologists’ reasoning? Read the NWS forecast discussion (BYZ) (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

Musselshell River near Roundup

2.0 mi

Below flood stage

Level: 1.2 ft

Reading from Sat 6 AM · NWS gauge page

Musselshell River at Musselshell

21 mi

Below flood stage

Level: 1.9 ft

Reading from Sat 6:30 AM · NWS gauge page

Musselshell River near Lavina

22 mi

Below flood stage

Level: 1.2 ft
Flow: 7 cfs

Reading from Sat 6:30 AM · NWS gauge page

For your home

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

Heating this week

About 69% less heating than a typical week.

This week 55Typical 180

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 40
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 8 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?

Roundup 15 SW · official normals 1991–2020 · records 2004–2025

Oct 24, today vs a typical year

Today’s expected high is 4°2° colder than typical.

Last 7 days vs normal

—SunOct 18
—MonOct 19
—TueOct 20
—WedOct 21
—ThuOct 22
—FriOct 23
—SatOct 24

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

Sun & moon

Sun

Daylight: 10 h 27 min; Losing 3 min 8 s a day; shortest Dec 21, 1 h 52 min less
Golden hour: 5:29–6:30 PM; Morning 7:25–8:26 AM
Blue hour: 6:30–6:42 PM; Morning 7:13–7:25 AM; first light 7:13 AM

Stars tonight? Fair

Clear 6:42 PM–7:14 AM, but the moon is 99% lit and up.

Moon

Waxing gibbous

97% lit · growing

Today: sets 5:58 AM · rises 5:12 PM
Full moon: Oct 25
New moon: Nov 9

Looking northwest from Roundup. The highest point on the skyline is about 8,600 ft, 42 mi away.Skyline from USGS elevation data, heights drawn up to 6× taller. Sky, sun and moon as they are now.

Roundup, MT weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Monday

Rest of week

What changed since yesterday

Radar

Rivers

Musselshell River near Roundup

Musselshell River at Musselshell

Musselshell River near Lavina

For your home

Heating this week

Heat-pump hours, next 7 days

Comfort

Open the windows?

Is this typical?

Oct 24, today vs a typical year

Last 7 days vs normal

Sun & moon

Sun

Stars tonight? Fair

Moon