Roundup, MT Weather Forecast
Local 7-day forecast
Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Roundup, MT in one place.
Sunny, with a high near 48. North northwest wind around 13 mph.
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: Oct 15, 2026 4:42 PM MDT.
The active forecast window currently covers Oct 15 to Oct 21, 2026 for Roundup, MT.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Oct 15 to Oct 21, 2026
- Latest sync
- Oct 15, 2026 4:42 PM MDT
- Forecast office
- BYZ
- Source
- NOAA / NWS
Daily Outlook
This Week in Roundup
Saturday looks like the warmest upcoming period in Roundup at 71 degrees F.
Tonight is the coolest period ahead with temperatures near 28 degrees F.
The strongest winds are forecast for Friday at about 7 to 16 mph SW.
The forecast from Oct 15 through Oct 21 stays mostly dry.
Forecast Details
- Last updated
- Oct 15, 2026 4:42 PM MDT
- Coverage
- 8 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
Mostly clear, with a low around 28. East southeast wind 1 to 6 mph.
Sunny, with a high near 62. Southwest wind 7 to 16 mph.
Mostly clear, with a low around 40. Southwest wind around 13 mph.
Sunny. High near 71, with temperatures falling to around 68 in the afternoon. Southwest wind 12 to 15 mph.
Partly cloudy, with a low around 41. West wind around 6 mph.
Sunny. High near 60, with temperatures falling to around 58 in the afternoon. East wind around 6 mph.
Mostly clear, with a low around 35. East wind 0 to 3 mph.
Sunny. High near 67, with temperatures falling to around 63 in the afternoon. South southwest wind around 7 mph.
Partly cloudy, with a low around 39. South southwest wind 0 to 3 mph.
Mostly sunny. High near 66, with temperatures falling to around 62 in the afternoon. Southwest wind around 6 mph.
Partly cloudy, with a low around 40. North wind around 5 mph.
Mostly sunny. High near 60, with temperatures falling to around 57 in the afternoon. North wind around 5 mph.
Partly cloudy, with a low around 40. South wind 0 to 5 mph.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
This Afternoon
Oct 15
|
Sunny
|
48°F |
13 mph
NNW
|
|
Tonight
Oct 15
|
Mostly Clear
|
28°F |
1 to 6 mph
ESE
|
|
Friday
Oct 16
|
Sunny
|
62°F |
7 to 16 mph
SW
|
|
Friday Night
Oct 16
|
Mostly Clear
|
40°F |
13 mph
SW
|
|
Saturday
Oct 17
|
Sunny
|
71°F |
12 to 15 mph
SW
|
|
Saturday Night
Oct 17
|
Partly Cloudy
|
41°F |
6 mph
W
|
|
Sunday
Oct 18
|
Sunny
|
60°F |
6 mph
E
|
|
Sunday Night
Oct 18
|
Mostly Clear
|
35°F |
0 to 3 mph
E
|
|
Monday
Oct 19
|
Sunny
|
67°F |
7 mph
SSW
|
|
Monday Night
Oct 19
|
Partly Cloudy
|
39°F |
0 to 3 mph
SSW
|
|
Tuesday
Oct 20
|
Mostly Sunny
|
66°F |
6 mph
SW
|
|
Tuesday Night
Oct 20
|
Partly Cloudy
|
40°F |
5 mph
N
|
|
Wednesday
Oct 21
|
Mostly Sunny
|
60°F |
5 mph
N
|
|
Wednesday Night
Oct 21
|
Partly Cloudy
|
40°F |
0 to 5 mph
S
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Roundup.
Nearby forecast pages are not available for this location yet.
