Forty Mile Colony, MT Weather Forecast
Local 7-day forecast
Mostly Clear
Track current conditions, temperature changes, wind, and the full daily outlook for Forty Mile Colony, MT in one place.
Mostly clear, with a low around 40. West southwest wind 3 to 9 mph.
Local Weather Overview
This forecast page for Forty Mile Colony, 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 15, 2026 3:43 AM MDT.
The active forecast window currently covers Sep 15 to Sep 21, 2026 for Forty Mile Colony, MT.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Sep 15 to Sep 21, 2026
- Latest sync
- Sep 15, 2026 3:43 AM MDT
- Forecast office
- BYZ
- Source
- NOAA / NWS
Daily Outlook
This Week in Forty Mile Colony
Monday looks like the warmest upcoming period in Forty Mile Colony at 80 degrees F.
Overnight is the coolest period ahead with temperatures near 40 degrees F.
The strongest winds are forecast for Tuesday at about 3 to 14 mph SE.
Precipitation is mentioned in 5 upcoming forecast periods.
Forecast Details
- Last updated
- Sep 15, 2026 3:43 AM 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
Sunny, with a high near 68. Southeast wind 3 to 14 mph.
Mostly clear. Low around 43, with temperatures rising to around 45 overnight. South wind 6 to 14 mph.
Sunny, with a high near 67. Northwest wind 7 to 14 mph.
Partly cloudy, with a low around 45. East wind 3 to 7 mph.
Mostly sunny, with a high near 77. East southeast wind around 5 mph.
A slight chance of rain showers after midnight. Mostly cloudy, with a low around 52. South wind around 5 mph. Chance of precipitation is 20%.
A chance of rain showers before noon, then showers and thunderstorms likely. Partly sunny. High near 73, with temperatures falling to around 69 in the afternoon. West wind 3 to 12 mph. Chance of precipitation is 60%.
Showers and thunderstorms likely. Mostly cloudy, with a low around 47. West northwest wind 5 to 12 mph. Chance of precipitation is 60%.
A chance of rain showers. Partly sunny, with a high near 70. Northwest wind around 7 mph. Chance of precipitation is 40%.
A chance of rain showers before midnight. Partly cloudy, with a low around 45. Southeast wind around 6 mph. Chance of precipitation is 30%.
Sunny. High near 75, with temperatures falling to around 73 in the afternoon. Southeast wind around 5 mph.
Mostly clear, with a low around 46. Southeast wind around 6 mph.
Sunny. High near 80, with temperatures falling to around 78 in the afternoon. East southeast wind 3 to 7 mph.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Overnight
Sep 15
|
Mostly Clear
|
40°F |
3 to 9 mph
WSW
|
|
Tuesday
Sep 15
|
Sunny
|
68°F |
3 to 14 mph
SE
|
|
Tuesday Night
Sep 15
|
Mostly Clear
|
43°F |
6 to 14 mph
S
|
|
Wednesday
Sep 16
|
Sunny
|
67°F |
7 to 14 mph
NW
|
|
Wednesday Night
Sep 16
|
Partly Cloudy
|
45°F |
3 to 7 mph
E
|
|
Thursday
Sep 17
|
Mostly Sunny
|
77°F |
5 mph
ESE
|
|
Thursday Night
Sep 17
|
Mostly Cloudy then Slight Chance Rain Showers
|
52°F |
5 mph
S
|
|
Friday
Sep 18
|
Showers And Thunderstorms Likely
|
73°F |
3 to 12 mph
W
|
|
Friday Night
Sep 18
|
Showers And Thunderstorms Likely
|
47°F |
5 to 12 mph
WNW
|
|
Saturday
Sep 19
|
Chance Rain Showers
|
70°F |
7 mph
NW
|
|
Saturday Night
Sep 19
|
Chance Rain Showers then Partly Cloudy
|
45°F |
6 mph
SE
|
|
Sunday
Sep 20
|
Sunny
|
75°F |
5 mph
SE
|
|
Sunday Night
Sep 20
|
Mostly Clear
|
46°F |
6 mph
SE
|
|
Monday
Sep 21
|
Sunny
|
80°F |
3 to 7 mph
ESE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Forty Mile Colony.