Lewis and Clark County, MT Weather Forecast
County weather hub
Slight Chance Rain Showers
Compare major city weather across Lewis and Clark County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
A slight chance of rain showers. Mostly cloudy, with a low around 49. Southwest wind around 5 mph. Chance of precipitation is 20%.
County Weather Overview
This county weather page brings together forecast coverage for Lewis and Clark County so visitors can compare temperatures, wind, and conditions across the region without hopping between unrelated pages.
Current forecast coverage spans 1 of 1 mapped cities in Lewis and Clark County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- Aug 29 to Sep 4, 2026
- Latest sync
- Aug 29, 2026 6:12 AM MDT
- Forecast office
- TFX
- Source
- NOAA / NWS
Daily Outlook
This Week in Lewis and Clark County
Tuesday looks like the warmest upcoming period in Lewis and Clark County at 74 degrees F.
Sunday Night is the coolest period ahead with temperatures near 38 degrees F.
The strongest winds are forecast for Sunday at about 12 to 23 mph WSW.
Precipitation is mentioned in 9 upcoming forecast periods.
Forecast Details
- Last updated
- Aug 29, 2026 6:12 AM 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
A chance of rain showers between 8am and noon, then a chance of showers and thunderstorms between noon and 2pm, then showers and thunderstorms likely between 2pm and 5pm, then a chance of showers and thunderstorms. Partly sunny. High near 66, with temperatures falling to around 61 in the afternoon. Southwest wind 5 to 10 mph, with gusts as high as 18 mph. Chance of precipitation is 70%.
Showers and thunderstorms likely before 8pm, then a chance of showers and thunderstorms between 8pm and 9pm, then showers and thunderstorms likely. Mostly cloudy, with a low around 41. West southwest wind 6 to 10 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible.
A chance of rain showers before noon. Partly sunny, with a high near 51. West southwest wind 12 to 23 mph, with gusts as high as 32 mph. Chance of precipitation is 40%.
Mostly clear, with a low around 38. West southwest wind 13 to 20 mph, with gusts as high as 30 mph.
Sunny, with a high near 64. West southwest wind 7 to 10 mph.
Mostly clear, with a low around 44. West wind 2 to 6 mph.
A slight chance of rain showers after noon. Mostly sunny, with a high near 74. Southwest wind 3 to 7 mph.
A chance of rain showers before midnight. Mostly cloudy, with a low around 45.
A chance of rain showers. Partly sunny, with a high near 66.
Mostly cloudy, with a low around 43.
Partly sunny, with a high near 65.
A slight chance of rain showers. Partly cloudy, with a low around 41.
A slight chance of rain showers. Mostly sunny, with a high near 63.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Overnight
Aug 29
|
Slight Chance Rain Showers
|
49°F |
5 mph
SW
|
|
Saturday
Aug 29
|
Chance Rain Showers then Chance Showers And Thunderstorms
|
66°F |
5 to 10 mph
SW
|
|
Saturday Night
Aug 29
|
Showers And Thunderstorms Likely
|
41°F |
6 to 10 mph
WSW
|
|
Sunday
Aug 30
|
Chance Rain Showers then Partly Sunny
|
51°F |
12 to 23 mph
WSW
|
|
Sunday Night
Aug 30
|
Mostly Clear
|
38°F |
13 to 20 mph
WSW
|
|
Monday
Aug 31
|
Sunny
|
64°F |
7 to 10 mph
WSW
|
|
Monday Night
Aug 31
|
Mostly Clear
|
44°F |
2 to 6 mph
W
|
|
Tuesday
Sep 1
|
Mostly Sunny then Slight Chance Rain Showers
|
74°F |
3 to 7 mph
SW
|
|
Tuesday Night
Sep 1
|
Chance Rain Showers then Mostly Cloudy
|
45°F |
7 mph
SW
|
|
Wednesday
Sep 2
|
Chance Rain Showers
|
66°F |
6 to 9 mph
WSW
|
|
Wednesday Night
Sep 2
|
Mostly Cloudy
|
43°F |
3 to 7 mph
WSW
|
|
Thursday
Sep 3
|
Partly Sunny
|
65°F |
5 to 8 mph
SW
|
|
Thursday Night
Sep 3
|
Slight Chance Rain Showers
|
41°F |
5 to 8 mph
W
|
|
Friday
Sep 4
|
Slight Chance Rain Showers
|
63°F |
6 mph
W
|
Major City Forecasts
Live forecast snapshots for major cities across Lewis and Clark County.
Coverage
Forecast coverage currently spans 1 of 1 mapped cities in Lewis and Clark County.
Largest mapped city population in this region: 33,737.
