Arnold, MT Weather Forecast
Local 7-day forecast
Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Arnold, MT in one place.
Sunny, with a high near 68. East northeast wind 0 to 8 mph.
Local Weather Overview
This forecast page for Arnold, 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: Sep 14, 2026 9:14 PM MDT.
The active forecast window currently covers Sep 15 to Sep 21, 2026 for Arnold, MT.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Sep 15 to Sep 21, 2026
- Latest sync
- Sep 14, 2026 9:14 PM MDT
- Forecast office
- TFX
- Source
- NOAA / NWS
Daily Outlook
This Week in Arnold
Thursday looks like the warmest upcoming period in Arnold at 74 degrees F.
Tuesday Night is the coolest period ahead with temperatures near 42 degrees F.
The strongest winds are forecast for Tuesday at about 0 to 8 mph ENE.
Precipitation is mentioned in 6 upcoming forecast periods.
Forecast Details
- Last updated
- Sep 14, 2026 9:14 PM MDT
- Coverage
- 7 days
- Time zone
- America/Denver
- Forecast office
- TFX
- Radar station
- KTFX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Partly cloudy, with a low around 42. Southeast wind 0 to 7 mph.
Sunny, with a high near 67. North northwest wind 0 to 6 mph.
Mostly clear, with a low around 43. East wind 1 to 6 mph.
A chance of showers and thunderstorms after noon. Mostly sunny, with a high near 74. East wind around 2 mph. Chance of precipitation is 30%.
Showers and thunderstorms likely. Mostly cloudy, with a low around 49. South wind around 5 mph.
A chance of rain showers before noon, then showers and thunderstorms likely. Mostly cloudy, with a high near 69. Northwest wind around 5 mph.
Showers and thunderstorms likely. Mostly cloudy, with a low around 46.
A chance of rain showers before noon, then a chance of showers and thunderstorms. Partly sunny, with a high near 68.
A slight chance of rain showers before midnight. Partly cloudy, with a low around 45.
Sunny, with a high near 71.
Mostly clear, with a low around 45.
Sunny, with a high near 74.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tuesday
Sep 15
|
Sunny
|
68°F |
0 to 8 mph
ENE
|
|
Tuesday Night
Sep 15
|
Partly Cloudy
|
42°F |
0 to 7 mph
SE
|
|
Wednesday
Sep 16
|
Sunny
|
67°F |
0 to 6 mph
NNW
|
|
Wednesday Night
Sep 16
|
Mostly Clear
|
43°F |
1 to 6 mph
E
|
|
Thursday
Sep 17
|
Mostly Sunny then Chance Showers And Thunderstorms
|
74°F |
2 mph
E
|
|
Thursday Night
Sep 17
|
Showers And Thunderstorms Likely
|
49°F |
5 mph
S
|
|
Friday
Sep 18
|
Showers And Thunderstorms Likely
|
69°F |
5 mph
NW
|
|
Friday Night
Sep 18
|
Showers And Thunderstorms Likely
|
46°F |
5 mph
SSW
|
|
Saturday
Sep 19
|
Chance Rain Showers
|
68°F |
3 mph
WSW
|
|
Saturday Night
Sep 19
|
Slight Chance Rain Showers then Partly Cloudy
|
45°F |
3 mph
S
|
|
Sunday
Sep 20
|
Sunny
|
71°F |
2 mph
W
|
|
Sunday Night
Sep 20
|
Mostly Clear
|
45°F |
3 mph
SE
|
|
Monday
Sep 21
|
Sunny
|
74°F |
3 mph
WNW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Arnold.