Lewis and Clark County, MT Weather Forecast
County weather hub
Sunny
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.
Sunny. High near 40, with temperatures falling to around 37 in the afternoon. Southwest wind around 5 mph.
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
- Oct 13 to Oct 19, 2026
- Latest sync
- Oct 13, 2026 2:51 PM MDT
- Forecast office
- TFX
- Source
- NOAA / NWS
Daily Outlook
This Week in Lewis and Clark County
Saturday looks like the warmest upcoming period in Lewis and Clark County at 58 degrees F.
Tonight is the coolest period ahead with temperatures near 26 degrees F.
The strongest winds are forecast for Saturday at about 15 mph SW.
Precipitation is mentioned in 1 upcoming forecast period.
Forecast Details
- Last updated
- Oct 13, 2026 2:51 PM MDT
- Coverage
- 8 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 26. Southwest wind 2 to 13 mph, with gusts as high as 18 mph.
Mostly sunny. High near 47, with temperatures falling to around 44 in the afternoon. West southwest wind 6 to 14 mph, with gusts as high as 21 mph.
Mostly clear, with a low around 30. West wind around 7 mph.
Sunny, with a high near 48. South southwest wind around 6 mph.
Mostly clear, with a low around 32. South southwest wind 2 to 12 mph.
Sunny, with a high near 57. Southwest wind 9 to 13 mph, with gusts as high as 22 mph.
Mostly clear, with a low around 38. Southwest wind 6 to 14 mph, with gusts as high as 18 mph.
Mostly sunny, with a high near 58.
Partly cloudy, with a low around 34.
Sunny, with a high near 53.
Partly cloudy, with a low around 35.
Mostly sunny, with a high near 55.
A slight chance of rain before midnight, then a chance of rain and snow. Mostly cloudy, with a low around 35.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
This Afternoon
Oct 13
|
Sunny
|
40°F |
5 mph
SW
|
|
Tonight
Oct 13
|
Partly Cloudy
|
26°F |
2 to 13 mph
SW
|
|
Wednesday
Oct 14
|
Mostly Sunny
|
47°F |
6 to 14 mph
WSW
|
|
Wednesday Night
Oct 14
|
Mostly Clear
|
30°F |
7 mph
W
|
|
Thursday
Oct 15
|
Sunny
|
48°F |
6 mph
SSW
|
|
Thursday Night
Oct 15
|
Mostly Clear
|
32°F |
2 to 12 mph
SSW
|
|
Friday
Oct 16
|
Sunny
|
57°F |
9 to 13 mph
SW
|
|
Friday Night
Oct 16
|
Mostly Clear
|
38°F |
6 to 14 mph
SW
|
|
Saturday
Oct 17
|
Mostly Sunny
|
58°F |
15 mph
SW
|
|
Saturday Night
Oct 17
|
Partly Cloudy
|
34°F |
8 to 14 mph
WSW
|
|
Sunday
Oct 18
|
Sunny
|
53°F |
7 mph
WSW
|
|
Sunday Night
Oct 18
|
Partly Cloudy
|
35°F |
2 to 6 mph
WSW
|
|
Monday
Oct 19
|
Mostly Sunny
|
55°F |
7 mph
SW
|
|
Monday Night
Oct 19
|
Slight Chance Light Rain then Chance Rain And Snow
|
35°F |
5 mph
WSW
|
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.
