Go Back
  • For Business
  • |
  • Warnings
  • Data Suite
  • Forensics
  • Advertising
  • Superior Accuracy™
Dolly to approach Caribbean as a tropical rainstorm. Click to see the forecast. Chevron right
Fall Foliage Forecast: See where vibrant colors are expected in autumn. Chevron right

Roundup, MT

64°F
Location Chevron down
Location News Videos
Use Current Location
Recent

Roundup

Montana

64°
No results found.
Try searching for a city, zip code or point of interest.
Get Premium+
Create Your Account Unlock extended daily and hourly forecasts — all with your free account.
Let's Go Chevron right
Have an account already? Log In
settings
Help
Roundup, MT Weather
Today WinterCast Local {stormName} Tracker Hourly 10-Day Radar MinuteCast® Monthly Air Quality Health & Activities

Around the Globe

Hurricane Tracker

Severe Weather

Radar & Maps

News

News & Features

Astronomy

Business

Climate

Health

Recreation

Sports

Travel

For Business

Warnings

Data Suite

Forensics

Advertising

Superior Accuracy™

Video

Winter Center

Today Hourly

10-Day

Radar MinuteCast® Monthly Air Quality Health & Activities

Unlock extended 90-day forecasts

Activate Your Premium+ Subscription

Chevron right

August 29 - September 12

Sat 8/29

85° /56°
55%
Periods of clouds and sunshine with a thundershower in spots this afternoon

RealFeel®85°

RealFeel Shade™82°

Max UV Index5.0 (Moderate)

WindWSW 8 mph

Total Hours of Precipitation0.5

Total Hours of Rain0.5

Sun 8/30

75° /50°
55%
Partial sunshine with a thunderstorm in parts of the area; breezy in the afternoon

RealFeel®74°

RealFeel Shade™71°

Max UV Index6.0 (High)

WindWNW 12 mph

Total Hours of Precipitation1

Total Hours of Rain1

Mon 8/31

83° /49°
2%
Mostly sunny

RealFeel®83°

RealFeel Shade™80°

Max UV Index6.0 (High)

WindW 9 mph

Tue 9/1

88° /57°
49%
A stray morning shower; otherwise, partial sunshine

RealFeel®88°

RealFeel Shade™85°

Max UV Index6.0 (High)

WindWSW 6 mph

Total Hours of Precipitation0.5

Total Hours of Rain0.5

Wed 9/2

86° /54°
55%
Sunshine and a few clouds, turning breezy in the afternoon with a thunderstorm around

RealFeel®86°

RealFeel Shade™82°

Max UV Index5.0 (Moderate)

WindWSW 12 mph

Total Hours of Precipitation0.5

Total Hours of Rain0.5

Thu 9/3

86° /53°
61%
Occasional rain in the morning; otherwise, rather cloudy

RealFeel®91°

RealFeel Shade™85°

Max UV Index4.0 (Moderate)

WindNNE 2 mph

Total Hours of Precipitation1

Total Hours of Rain1

Fri 9/4

81° /52°
0%
Sun through high clouds

RealFeel®80°

RealFeel Shade™78°

Max UV Index3.0 (Moderate)

WindSW 7 mph

Sat 9/5

78° /49°
55%
Times of clouds and sun with a stray shower in the afternoon

RealFeel®78°

RealFeel Shade™75°

Max UV Index5.0 (Moderate)

WindNE 8 mph

Total Hours of Precipitation1

Total Hours of Rain1

Sun 9/6

78° /51°
61%
Mostly cloudy with a couple of showers and a thunderstorm, mainly early in the day

RealFeel®79°

RealFeel Shade™77°

Max UV Index2.0 (Low)

WindNE 4 mph

Total Hours of Precipitation1.5

Total Hours of Rain1.5

Mon 9/7

79° /48°
7%
Mostly sunny

RealFeel®78°

RealFeel Shade™76°

Max UV Index5.0 (Moderate)

WindNNW 7 mph

Tue 9/8

79° /46°
2%
Brilliant sunshine

RealFeel®78°

RealFeel Shade™75°

Max UV Index5.0 (Moderate)

WindNW 9 mph

Wed 9/9

75° /48°
0%
Plenty of sunshine

RealFeel®78°

RealFeel Shade™73°

Max UV Index5.0 (Moderate)

WindSE 5 mph

Thu 9/10

80° /49°
2%
Intervals of clouds and sunshine

RealFeel®81°

RealFeel Shade™79°

Max UV Index4.0 (Moderate)

WindENE 5 mph

Fri 9/11

79° /45°
20%
Partial sunshine

RealFeel®82°

RealFeel Shade™77°

Max UV Index5.0 (Moderate)

WindW 6 mph

Sat 9/12

72° /46°
20%
Not as warm with decreasing clouds

RealFeel®75°

RealFeel Shade™70°

Max UV Index5.0 (Moderate)

WindSW 4 mph

Around the Globe

Hurricane Tracker

Severe Weather

Radar & Maps

News

Video

Winter Center

Top Stories

Hurricane

Dolly to drench northern Caribbean, raise flood risk

14 hours ago

Severe Weather

Illinois sets US state record for most tornadoes in a year

15 hours ago

Hurricane

Dolly could regroup as US tropical threats unfold as Labor Day nears

14 hours ago

Weather News

What caused the Nepal flood wave? Here’s what we know

1 day ago

Weather Forecasts

Heat dome to bounce back in Mississippi Valley, East as West cools

12 hours ago

More Stories

Featured Stories

Astronomy

NASA’s Roman Space Telescope set to launch Sunday

17 hours ago

Weather News

Hummingbirds are migrating south. This map shows when they will leave

1 day ago

Weather News

Amazon rivers falling faster as El Niño intensifies

17 hours ago

Health

As a measles outbreak escalates in Pennsylvania’s Amish Country

17 hours ago

Climate

Global ocean heat breaks record months after its usual peak

2 days ago

World North America United States Montana Roundup

Weather Near Roundup:

  • Billings, MT
  • Cody, WY
  • Miles City, MT
Company
Proven Superior Accuracy™ About AccuWeather Digital Advertising Careers Press Contact Us
Products & Services
For Business For Partners For Advertising AccuWeather APIs AccuWeather Connect Personal Weather Stations
Apps & Downloads
iPhone App Android App See all Apps & Downloads
Subscription Services
AccuWeather Premium AccuWeather Professional
More
AccuWeather Ready Business Health Hurricane Leisure and Recreation Severe Weather Space and Astronomy Sports Travel Weather News Winter Center
Company
Proven Superior Accuracy™ About AccuWeather Digital Advertising Careers Press Contact Us
Products & Services
For Business For Partners For Advertising AccuWeather APIs AccuWeather Connect Personal Weather Stations
Apps & Downloads
iPhone App Android App See all Apps & Downloads
Subscription Services
AccuWeather Premium AccuWeather Professional
More
AccuWeather Ready Business Health Hurricane Leisure and Recreation Severe Weather Space and Astronomy Sports Travel Weather News Winter Center
© 2026 AccuWeather, Inc. "AccuWeather" and sun design are registered trademarks of AccuWeather, Inc. All Rights Reserved.
Terms of Use | Privacy Policy | Cookie Policy | About Your Privacy Do Not Sell or Share My Personal Information | Data Sources

...

...

...