Roundup, MT Weather Forecast
Local 7-day forecast
Mostly Sunny then Chance Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Roundup, MT in one place.
A chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 87. North wind around 13 mph. Chance of precipitation is 40%.
Local Weather Overview
This forecast page for Roundup, MT is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Jul 14, 2026 9:04 PM MDT.
The active forecast window currently covers Jul 15 to Jul 21, 2026 for Roundup, MT.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 15 to Jul 21, 2026
- Latest sync
- Jul 14, 2026 9:04 PM MDT
- Forecast office
- BYZ
- Source
- NOAA / NWS
Daily Outlook
This Week in Roundup
Saturday looks like the warmest upcoming period in Roundup at 98 degrees F.
Monday Night is the coolest period ahead with temperatures near 60 degrees F.
The strongest winds are forecast for Wednesday at about 13 mph N.
Precipitation is mentioned in 7 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 14, 2026 9:04 PM MDT
- Coverage
- 7 days
- Time zone
- America/Denver
- Forecast office
- BYZ
- Radar station
- KBLX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
A chance of showers and thunderstorms before 9pm, then a chance of showers and thunderstorms between 9pm and midnight. Mostly cloudy. Low around 61, with temperatures rising to around 63 overnight. North wind 5 to 12 mph. Chance of precipitation is 40%.
Sunny, with a high near 92. North wind 3 to 7 mph.
A slight chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 63. East northeast wind 3 to 8 mph. Chance of precipitation is 20%.
Mostly sunny. High near 97, with temperatures falling to around 95 in the afternoon. East wind 3 to 9 mph.
A chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 64. East wind 3 to 8 mph. Chance of precipitation is 50%.
A chance of showers and thunderstorms after noon. Partly sunny. High near 98, with temperatures falling to around 95 in the afternoon. West northwest wind around 6 mph. Chance of precipitation is 30%.
A chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 63. West northwest wind 3 to 8 mph. Chance of precipitation is 40%.
Mostly sunny, with a high near 93. North northwest wind 5 to 9 mph.
Partly cloudy, with a low around 61. North northeast wind 2 to 12 mph.
Mostly sunny, with a high near 87. North northeast wind 3 to 10 mph.
Partly cloudy. Low around 60, with temperatures rising to around 62 overnight. Northeast wind 6 to 12 mph.
A slight chance of showers and thunderstorms after noon. Mostly sunny. High near 86, with temperatures falling to around 84 in the afternoon. Northeast wind 6 to 12 mph.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Wednesday
Jul 15
|
Mostly Sunny then Chance Showers And Thunderstorms
|
87°F |
13 mph
N
|
|
Wednesday Night
Jul 15
|
Chance Showers And Thunderstorms then Mostly Cloudy
|
61°F |
5 to 12 mph
N
|
|
Thursday
Jul 16
|
Sunny
|
92°F |
3 to 7 mph
N
|
|
Thursday Night
Jul 16
|
Slight Chance Showers And Thunderstorms then Partly Cloudy
|
63°F |
3 to 8 mph
ENE
|
|
Friday
Jul 17
|
Mostly Sunny
|
97°F |
3 to 9 mph
E
|
|
Friday Night
Jul 17
|
Chance Showers And Thunderstorms then Mostly Cloudy
|
64°F |
3 to 8 mph
E
|
|
Saturday
Jul 18
|
Partly Sunny then Chance Showers And Thunderstorms
|
98°F |
6 mph
WNW
|
|
Saturday Night
Jul 18
|
Chance Showers And Thunderstorms then Mostly Cloudy
|
63°F |
3 to 8 mph
WNW
|
|
Sunday
Jul 19
|
Mostly Sunny
|
93°F |
5 to 9 mph
NNW
|
|
Sunday Night
Jul 19
|
Partly Cloudy
|
61°F |
2 to 12 mph
NNE
|
|
Monday
Jul 20
|
Mostly Sunny
|
87°F |
3 to 10 mph
NNE
|
|
Monday Night
Jul 20
|
Partly Cloudy
|
60°F |
6 to 12 mph
NE
|
|
Tuesday
Jul 21
|
Mostly Sunny then Slight Chance Showers And Thunderstorms
|
86°F |
6 to 12 mph
NE
|
Nearby Forecasts
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