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 between 1am and 4am. Mostly cloudy. Low around 57, with temperatures rising to around 60 overnight. North northwest wind around 3 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
- Jul 14 to Jul 20, 2026
- Latest sync
- Jul 14, 2026 2:49 AM MDT
- Forecast office
- TFX
- Source
- NOAA / NWS
Daily Outlook
This Week in Lewis and Clark County
Sunday looks like the warmest upcoming period in Lewis and Clark County at 81 degrees F.
Wednesday Night is the coolest period ahead with temperatures near 52 degrees F.
The strongest winds are forecast for Tuesday Night at about 3 to 9 mph N.
Precipitation is mentioned in 13 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 14, 2026 2:49 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 slight chance of showers and thunderstorms between 3pm and 5pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 77. North northeast wind 2 to 8 mph. Chance of precipitation is 30%.
A chance of showers and thunderstorms before midnight, then showers and thunderstorms likely. Mostly cloudy. Low around 53, with temperatures rising to around 56 overnight. North wind 3 to 9 mph, with gusts as high as 18 mph. Chance of precipitation is 60%.
A chance of rain showers before noon, then showers and thunderstorms likely. Mostly cloudy, with a high near 75. Northwest wind around 5 mph. Chance of precipitation is 70%.
A chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 52. West northwest wind around 3 mph. Chance of precipitation is 30%.
A slight chance of showers and thunderstorms after noon. Sunny, with a high near 78. North northeast wind around 6 mph. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 53. North wind 3 to 7 mph.
A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 79. Northwest wind around 6 mph.
A chance of rain showers before midnight. Partly cloudy, with a low around 54.
A slight chance of rain showers after noon. Mostly sunny, with a high near 79.
A chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 55.
Mostly sunny, with a high near 81.
A slight chance of rain showers. Partly cloudy, with a low around 54.
A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 78.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Overnight
Jul 14
|
Slight Chance Rain Showers
|
57°F |
3 mph
NNW
|
|
Tuesday
Jul 14
|
Partly Sunny then Slight Chance Showers And Thunderstorms
|
77°F |
2 to 8 mph
NNE
|
|
Tuesday Night
Jul 14
|
Chance Showers And Thunderstorms then Showers And Thunderstorms Likely
|
53°F |
3 to 9 mph
N
|
|
Wednesday
Jul 15
|
Showers And Thunderstorms Likely
|
75°F |
5 mph
NW
|
|
Wednesday Night
Jul 15
|
Chance Showers And Thunderstorms then Partly Cloudy
|
52°F |
3 mph
WNW
|
|
Thursday
Jul 16
|
Sunny then Slight Chance Showers And Thunderstorms
|
78°F |
6 mph
NNE
|
|
Thursday Night
Jul 16
|
Slight Chance Showers And Thunderstorms then Partly Cloudy
|
53°F |
3 to 7 mph
N
|
|
Friday
Jul 17
|
Mostly Sunny then Slight Chance Showers And Thunderstorms
|
79°F |
6 mph
NW
|
|
Friday Night
Jul 17
|
Chance Rain Showers then Partly Cloudy
|
54°F |
6 mph
W
|
|
Saturday
Jul 18
|
Mostly Sunny then Slight Chance Rain Showers
|
79°F |
6 mph
WSW
|
|
Saturday Night
Jul 18
|
Chance Showers And Thunderstorms then Mostly Cloudy
|
55°F |
6 mph
NW
|
|
Sunday
Jul 19
|
Mostly Sunny
|
81°F |
6 mph
WSW
|
|
Sunday Night
Jul 19
|
Slight Chance Rain Showers
|
54°F |
6 mph
NW
|
|
Monday
Jul 20
|
Mostly Sunny then Slight Chance Showers And Thunderstorms
|
78°F |
7 mph
N
|
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.
